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HydroCAD Report West 01-13-2020A1 General Drainage Area A2 General Drainage Area A3 General Drainage Area A4 General Drainage Area A5 General Drainage Area A6 General Drainage Area D3a Lot 3 driveway D3b Lot 3 driveway D5D7 Habitat common driveway and D5 D6 Lot 4/6 driveway H3a House - Lot 3 H3b House - Lot 3 H4a House - Lot 4 H4b House - Lot 4 H579 House - Lot 5a, 7, 9a H5a House - Lot 5 H6 House - Lot 6 H8 House - Lot 8 CP1 Control Point 1 S1 Swale Segment S2 Swale Segment 1P DETENTION AREA - WEST DW3a Lot 3 house dry well DW3b Lot 3 house dry well DW4a Lot 4 dry well DW4b LOT 4 dry well DW579 Lot 5,7,9 dry wells DW5a LOT 5 dry well DW6 Lot 6 dry well DW8 Lot 8 dry well GD3a Lot 3 gravel diaphragm GD3b LOT 3 gravel diaphragm GD579 Lots 3,4,5,7,9 gravel diaphragms GD6 LOT 6 gravel diaphragm Routing Diagram for Burts Pit Proposed 12132019 REV 2020_0108 Prepared by Berkshire Design Group, Printed 1/13/2020 HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Subcat Reach Pond Link NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 2HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A1: General Drainage Area Runoff = 0.70 cfs @ 12.13 hrs, Volume= 0.046 af, Depth= 1.18" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description 4,045 98 Paved parking, HSG C 4,064 70 Woods, Good, HSG C 12,186 74 >75% Grass cover, Good, HSG C 20,295 78 Weighted Average 16,250 80.07% Pervious Area 4,045 19.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.9 275 0.0413 0.77 Lag/CN Method, Tc Contour Length= 838' Interval= 1' Subcatchment A1: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=20,295 sf Runoff Volume=0.046 af Runoff Depth=1.18" Flow Length=275' Slope=0.0413 '/' Tc=5.9 min CN=78 0.70 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 3HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A2: General Drainage Area Runoff = 0.72 cfs @ 12.18 hrs, Volume= 0.059 af, Depth= 0.85" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description 2,148 98 Paved parking, HSG C 26,605 70 Woods, Good, HSG C 7,416 74 >75% Grass cover, Good, HSG C 36,169 72 Weighted Average 34,021 94.06% Pervious Area 2,148 5.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.6 395 0.0395 0.69 Lag/CN Method, Tc Contour Length= 1,430' Interval= 1' Subcatchment A2: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=36,169 sf Runoff Volume=0.059 af Runoff Depth=0.85" Flow Length=395' Slope=0.0395 '/' Tc=9.6 min CN=72 0.72 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 4HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A3: General Drainage Area Runoff = 0.24 cfs @ 12.13 hrs, Volume= 0.015 af, Depth= 1.01" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description 173 98 Paved parking, HSG C 7,722 74 >75% Grass cover, Good, HSG C 7,895 75 Weighted Average 7,722 97.81% Pervious Area 173 2.19% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.2 218 0.0442 0.70 Lag/CN Method, Tc Contour Length= 349' Interval= 1' Subcatchment A3: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.26 0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=7,895 sf Runoff Volume=0.015 af Runoff Depth=1.01" Flow Length=218' Slope=0.0442 '/' Tc=5.2 min CN=75 0.24 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 5HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A4: General Drainage Area Runoff = 0.17 cfs @ 12.12 hrs, Volume= 0.011 af, Depth= 1.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description 380 98 Paved parking, HSG C 4,840 74 >75% Grass cover, Good, HSG C 5,220 76 Weighted Average 4,840 92.72% Pervious Area 380 7.28% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment A4: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=5,220 sf Runoff Volume=0.011 af Runoff Depth=1.06" Tc=4.0 min CN=76 0.17 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 6HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A5: General Drainage Area Runoff = 0.73 cfs @ 12.13 hrs, Volume= 0.048 af, Depth= 1.01" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description 1,710 98 Paved parking, HSG C 2,580 70 Woods, Good, HSG C 20,496 74 >75% Grass cover, Good, HSG C 24,786 75 Weighted Average 23,076 93.10% Pervious Area 1,710 6.90% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.5 248 0.0484 0.75 Lag/CN Method, Tc Contour Length= 1,200' Interval= 1' Subcatchment A5: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=24,786 sf Runoff Volume=0.048 af Runoff Depth=1.01" Flow Length=248' Slope=0.0484 '/' Tc=5.5 min CN=75 0.73 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 7HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A6: General Drainage Area Runoff = 0.65 cfs @ 12.21 hrs, Volume= 0.060 af, Depth= 0.80" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description 26,444 70 Woods, Good, HSG C 12,866 74 >75% Grass cover, Good, HSG C 96 98 Paved parking, HSG C 39,406 71 Weighted Average 39,310 99.76% Pervious Area 96 0.24% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.5 539 0.0407 0.72 Lag/CN Method, Tc Contour Length= 1,605' Interval= 1' Subcatchment A6: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=39,406 sf Runoff Volume=0.060 af Runoff Depth=0.80" Flow Length=539' Slope=0.0407 '/' Tc=12.5 min CN=71 0.65 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 8HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment D3a: Lot 3 driveway Runoff = 0.08 cfs @ 12.11 hrs, Volume= 0.006 af, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description * 1,030 98 driveway 1,030 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment D3a: Lot 3 driveway Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=1,030 sf Runoff Volume=0.006 af Runoff Depth=2.84" Tc=4.0 min CN=98 0.08 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 9HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment D3b: Lot 3 driveway Runoff = 0.06 cfs @ 12.11 hrs, Volume= 0.004 af, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description * 770 98 driveway 770 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment D3b: Lot 3 driveway Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=770 sf Runoff Volume=0.004 af Runoff Depth=2.84" Tc=4.0 min CN=98 0.06 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 10HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment D5D7: Habitat common driveway and D5 Runoff = 0.22 cfs @ 12.11 hrs, Volume= 0.016 af, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description * 2,900 98 driveway 2,900 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment D5D7: Habitat common driveway and D5 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=2,900 sf Runoff Volume=0.016 af Runoff Depth=2.84" Tc=4.0 min CN=98 0.22 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 11HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment D6: Lot 4/6 driveway Runoff = 0.16 cfs @ 12.11 hrs, Volume= 0.011 af, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description * 2,032 98 driveway 2,032 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment D6: Lot 4/6 driveway Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=2,032 sf Runoff Volume=0.011 af Runoff Depth=2.84" Tc=4.0 min CN=98 0.16 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 12HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H3a: House - Lot 3 Runoff = 0.06 cfs @ 12.11 hrs, Volume= 0.004 af, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description * 722 98 roof 722 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H3a: House - Lot 3 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=722 sf Runoff Volume=0.004 af Runoff Depth=2.84" Tc=4.0 min CN=98 0.06 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 13HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H3b: House - Lot 3 Runoff = 0.04 cfs @ 12.11 hrs, Volume= 0.003 af, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description * 542 98 roof 542 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H3b: House - Lot 3 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.046 0.044 0.042 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=542 sf Runoff Volume=0.003 af Runoff Depth=2.84" Tc=4.0 min CN=98 0.04 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 14HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H4a: House - Lot 4 Runoff = 0.04 cfs @ 12.11 hrs, Volume= 0.003 af, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description * 542 98 roof 542 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H4a: House - Lot 4 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.046 0.044 0.042 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=542 sf Runoff Volume=0.003 af Runoff Depth=2.84" Tc=4.0 min CN=98 0.04 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 15HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H4b: House - Lot 4 Runoff = 0.06 cfs @ 12.11 hrs, Volume= 0.004 af, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description * 722 98 driveway 722 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H4b: House - Lot 4 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=722 sf Runoff Volume=0.004 af Runoff Depth=2.84" Tc=4.0 min CN=98 0.06 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 16HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H579: House - Lot 5a, 7, 9a Runoff = 0.14 cfs @ 12.11 hrs, Volume= 0.010 af, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description * 1,800 98 driveway 1,800 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H579: House - Lot 5a, 7, 9a Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=1,800 sf Runoff Volume=0.010 af Runoff Depth=2.84" Tc=4.0 min CN=98 0.14 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 17HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H5a: House - Lot 5 Runoff = 0.03 cfs @ 12.11 hrs, Volume= 0.002 af, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description * 400 98 roof 400 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H5a: House - Lot 5 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=400 sf Runoff Volume=0.002 af Runoff Depth=2.84" Tc=4.0 min CN=98 0.03 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 18HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H6: House - Lot 6 Runoff = 0.10 cfs @ 12.11 hrs, Volume= 0.007 af, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description * 1,264 98 driveway 1,264 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H6: House - Lot 6 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=1,264 sf Runoff Volume=0.007 af Runoff Depth=2.84" Tc=4.0 min CN=98 0.10 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 19HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H8: House - Lot 8 Runoff = 0.10 cfs @ 12.11 hrs, Volume= 0.007 af, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 2-Year Rainfall=3.07" Area (sf) CN Description * 1,264 98 driveway 1,264 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H8: House - Lot 8 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 2-Year Rainfall=3.07" Runoff Area=1,264 sf Runoff Volume=0.007 af Runoff Depth=2.84" Tc=4.0 min CN=98 0.10 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 20HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Reach CP1: Control Point 1 Inflow Area = 3.392 ac, 15.25% Impervious, Inflow Depth = 0.89" for 2-Year event Inflow = 2.07 cfs @ 12.14 hrs, Volume= 0.252 af Outflow = 2.07 cfs @ 12.14 hrs, Volume= 0.252 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Reach CP1: Control Point 1 Inflow Outflow Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)2 1 0 Inflow Area=3.392 ac 2.07 cfs2.07 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 21HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Reach S1: Swale Segment Inflow Area = 2.043 ac, 15.79% Impervious, Inflow Depth = 0.85" for 2-Year event Inflow = 0.67 cfs @ 12.13 hrs, Volume= 0.144 af Outflow = 0.65 cfs @ 12.14 hrs, Volume= 0.144 af, Atten= 3%, Lag= 0.8 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Max. Velocity= 0.82 fps, Min. Travel Time= 1.4 min Avg. Velocity = 0.41 fps, Avg. Travel Time= 2.8 min Peak Storage= 56 cf @ 12.14 hrs Average Depth at Peak Storage= 0.08' Bank-Full Depth= 1.00' Flow Area= 33.3 sf, Capacity= 142.77 cfs 50.00' x 1.00' deep Parabolic Channel, n= 0.030 Earth, grassed & winding Length= 70.0' Slope= 0.0129 '/' Inlet Invert= 307.40', Outlet Invert= 306.50' ‡ Reach S1: Swale Segment Inflow Outflow Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=2.043 ac Avg. Flow Depth=0.08' Max Vel=0.82 fps n=0.030 L=70.0' S=0.0129 '/' Capacity=142.77 cfs 0.67 cfs0.65 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 22HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Reach S1: Swale Segment Primary Stage-Discharge Discharge (cfs) 1401301201101009080706050403020100Depth (feet)1 0 NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 23HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Reach S2: Swale Segment Inflow Area = 1.686 ac, 15.07% Impervious, Inflow Depth = 0.83" for 2-Year event Inflow = 0.33 cfs @ 12.64 hrs, Volume= 0.116 af Outflow = 0.33 cfs @ 12.66 hrs, Volume= 0.116 af, Atten= 0%, Lag= 1.5 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Max. Velocity= 0.74 fps, Min. Travel Time= 2.0 min Avg. Velocity = 0.45 fps, Avg. Travel Time= 3.4 min Peak Storage= 40 cf @ 12.66 hrs Average Depth at Peak Storage= 0.06' Bank-Full Depth= 1.00' Flow Area= 33.3 sf, Capacity= 167.89 cfs 50.00' x 1.00' deep Parabolic Channel, n= 0.030 Earth, grassed & winding Length= 90.0' Slope= 0.0178 '/' Inlet Invert= 309.40', Outlet Invert= 307.80' ‡ Reach S2: Swale Segment Inflow Outflow Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=1.686 ac Avg. Flow Depth=0.06' Max Vel=0.74 fps n=0.030 L=90.0' S=0.0178 '/' Capacity=167.89 cfs 0.33 cfs0.33 cfs NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 24HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Reach S2: Swale Segment Primary Stage-Discharge Discharge (cfs) 160140120100806040200Depth (feet)1 0 NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 25HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond 1P: DETENTION AREA - WEST Inflow Area = 1.686 ac, 15.07% Impervious, Inflow Depth = 0.88" for 2-Year event Inflow = 1.56 cfs @ 12.14 hrs, Volume= 0.123 af Outflow = 0.36 cfs @ 12.64 hrs, Volume= 0.123 af, Atten= 77%, Lag= 30.1 min Discarded = 0.03 cfs @ 12.64 hrs, Volume= 0.007 af Primary = 0.33 cfs @ 12.64 hrs, Volume= 0.116 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.01' @ 12.64 hrs Surf.Area= 3,050 sf Storage= 1,402 cf Plug-Flow detention time= 35.8 min calculated for 0.123 af (100% of inflow) Center-of-Mass det. time= 35.8 min ( 908.9 - 873.1 ) Volume Invert Avail.Storage Storage Description #1 309.80' 9,788 cf Custom Stage Data (Irregular) Listed below Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 309.80 5 1.0 0 0 5 310.00 200 65.0 16 16 341 311.00 3,000 250.0 1,325 1,341 4,981 312.00 6,934 395.0 4,832 6,172 12,431 312.50 7,533 404.0 3,616 9,788 13,037 Device Routing Invert Outlet Devices #1 Primary 309.75'12.0" Round Culvert L= 25.0' RCP, groove end w/headwall, Ke= 0.200 Inlet / Outlet Invert= 309.75' / 309.50' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 0.79 sf #2 Device 1 309.80'3.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 311.70'6.0' long x 0.5' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 #4 Discarded 309.80'0.250 in/hr Exfiltration over Wetted area Conductivity to Groundwater Elevation = 300.00' Phase-In= 0.01' Discarded OutFlow Max=0.03 cfs @ 12.64 hrs HW=311.01' (Free Discharge) 4=Exfiltration ( Controls 0.03 cfs) Primary OutFlow Max=0.33 cfs @ 12.64 hrs HW=311.01' TW=309.46' (Dynamic Tailwater) 1=Culvert (Passes 0.33 cfs of 3.41 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.33 cfs @ 4.97 fps) 3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 26HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond 1P: DETENTION AREA - WEST Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)1 0 Inflow Area=1.686 ac Peak Elev=311.01' Storage=1,402 cf 1.56 cfs 0.36 cfs 0.03 cfs 0.33 cfs Pond 1P: DETENTION AREA - WEST Total Discarded Primary Stage-Discharge Discharge (cfs) 6543210Elevation (feet)312 311 310 Exfiltration Orifice/Grate Broad-Crested Rectangular Weir NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 27HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW3a: Lot 3 house dry well Inflow Area = 0.017 ac,100.00% Impervious, Inflow Depth = 2.84" for 2-Year event Inflow = 0.06 cfs @ 12.11 hrs, Volume= 0.004 af Outflow = 0.00 cfs @ 13.16 hrs, Volume= 0.004 af, Atten= 93%, Lag= 62.8 min Discarded = 0.00 cfs @ 13.16 hrs, Volume= 0.004 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.24' @ 13.16 hrs Surf.Area= 654 sf Storage= 62 cf Plug-Flow detention time= 115.2 min calculated for 0.004 af (100% of inflow) Center-of-Mass det. time= 115.1 min ( 872.7 - 757.5 ) Volume Invert Avail.Storage Storage Description #1 311.00' 105 cf Custom Stage Data (Conic) Listed below 262 cf Overall x 40.0% Voids 105 cf x 3.00 = 314 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 311.00 218 0 0 218 312.20 218 262 262 281 Device Routing Invert Outlet Devices #1 Primary 312.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 311.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 13.16 hrs HW=311.24' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=311.00' TW=0.00' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 28HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW3a: Lot 3 house dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.017 ac Peak Elev=311.24' Storage=62 cf 0.06 cfs 0.00 cfs0.00 cfs 0.00 cfs Pond DW3a: Lot 3 house dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)312 311 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 29HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW3b: Lot 3 house dry well Inflow Area = 0.012 ac,100.00% Impervious, Inflow Depth = 2.84" for 2-Year event Inflow = 0.04 cfs @ 12.11 hrs, Volume= 0.003 af Outflow = 0.00 cfs @ 13.15 hrs, Volume= 0.003 af, Atten= 93%, Lag= 62.6 min Discarded = 0.00 cfs @ 13.15 hrs, Volume= 0.003 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.24' @ 13.15 hrs Surf.Area= 489 sf Storage= 47 cf Plug-Flow detention time= 114.8 min calculated for 0.003 af (100% of inflow) Center-of-Mass det. time= 114.8 min ( 872.3 - 757.5 ) Volume Invert Avail.Storage Storage Description #1 311.00' 78 cf Custom Stage Data (Conic) Listed below 196 cf Overall x 40.0% Voids 78 cf x 3.00 = 235 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 311.00 163 0 0 163 312.20 163 196 196 217 Device Routing Invert Outlet Devices #1 Primary 312.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 311.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 13.15 hrs HW=311.24' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=311.00' TW=307.40' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 30HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW3b: Lot 3 house dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.046 0.044 0.042 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Inflow Area=0.012 ac Peak Elev=311.24' Storage=47 cf 0.04 cfs 0.00 cfs0.00 cfs 0.00 cfs Pond DW3b: Lot 3 house dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)312 311 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 31HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW4a: Lot 4 dry well Inflow Area = 0.012 ac,100.00% Impervious, Inflow Depth = 2.84" for 2-Year event Inflow = 0.04 cfs @ 12.11 hrs, Volume= 0.003 af Outflow = 0.00 cfs @ 13.15 hrs, Volume= 0.003 af, Atten= 93%, Lag= 62.6 min Discarded = 0.00 cfs @ 13.15 hrs, Volume= 0.003 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.24' @ 13.15 hrs Surf.Area= 489 sf Storage= 47 cf Plug-Flow detention time= 114.8 min calculated for 0.003 af (100% of inflow) Center-of-Mass det. time= 114.8 min ( 872.3 - 757.5 ) Volume Invert Avail.Storage Storage Description #1 311.00' 78 cf Custom Stage Data (Conic) Listed below 196 cf Overall x 40.0% Voids 78 cf x 3.00 = 235 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 311.00 163 0 0 163 312.20 163 196 196 217 Device Routing Invert Outlet Devices #1 Primary 312.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 311.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 13.15 hrs HW=311.24' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=311.00' TW=0.00' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 32HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW4a: Lot 4 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.046 0.044 0.042 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Inflow Area=0.012 ac Peak Elev=311.24' Storage=47 cf 0.04 cfs 0.00 cfs0.00 cfs 0.00 cfs Pond DW4a: Lot 4 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)312 311 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 33HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW4b: LOT 4 dry well Inflow Area = 0.017 ac,100.00% Impervious, Inflow Depth = 2.84" for 2-Year event Inflow = 0.06 cfs @ 12.11 hrs, Volume= 0.004 af Outflow = 0.00 cfs @ 13.16 hrs, Volume= 0.004 af, Atten= 93%, Lag= 63.1 min Discarded = 0.00 cfs @ 13.16 hrs, Volume= 0.004 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 313.24' @ 13.16 hrs Surf.Area= 651 sf Storage= 62 cf Plug-Flow detention time= 116.0 min calculated for 0.004 af (100% of inflow) Center-of-Mass det. time= 116.0 min ( 873.5 - 757.5 ) Volume Invert Avail.Storage Storage Description #1 313.00' 104 cf Lot 4 dry well (Conic) Listed below 260 cf Overall x 40.0% Voids 104 cf x 3.00 = 312 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 217 0 0 217 314.20 217 260 260 280 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth 314 Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 13.16 hrs HW=313.24' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=313.00' TW=307.40' (Dynamic Tailwater) 1=314 ( Controls 0.00 cfs) NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 34HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW4b: LOT 4 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.017 ac Peak Elev=313.24' Storage=62 cf 0.06 cfs 0.00 cfs0.00 cfs 0.00 cfs Pond DW4b: LOT 4 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration 314 NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 35HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW579: Lot 5,7,9 dry wells Inflow Area = 0.041 ac,100.00% Impervious, Inflow Depth = 2.84" for 2-Year event Inflow = 0.14 cfs @ 12.11 hrs, Volume= 0.010 af Outflow = 0.01 cfs @ 13.20 hrs, Volume= 0.007 af, Atten= 93%, Lag= 65.5 min Discarded = 0.00 cfs @ 13.20 hrs, Volume= 0.007 af Primary = 0.01 cfs @ 13.20 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 313.00' @ 13.20 hrs Surf.Area= 540 sf Storage= 217 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 287.0 min ( 1,044.5 - 757.5 ) Volume Invert Avail.Storage Storage Description #1 312.00' 259 cf Custom Stage Data (Conic) Listed below 648 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 312.00 540 0 0 540 313.20 540 648 648 639 Device Routing Invert Outlet Devices #1 Discarded 312.00'0.250 in/hr Exfiltration over Wetted area #2 Primary 313.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 Discarded OutFlow Max=0.00 cfs @ 13.20 hrs HW=313.00' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.01 cfs @ 13.20 hrs HW=313.00' TW=310.92' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir (Weir Controls 0.01 cfs @ 0.16 fps) NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 36HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW579: Lot 5,7,9 dry wells Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.041 ac Peak Elev=313.00' Storage=217 cf 0.14 cfs 0.01 cfs 0.00 cfs0.01 cfs Pond DW579: Lot 5,7,9 dry wells Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)313 312 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 37HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW5a: LOT 5 dry well Inflow Area = 0.009 ac,100.00% Impervious, Inflow Depth = 2.84" for 2-Year event Inflow = 0.03 cfs @ 12.11 hrs, Volume= 0.002 af Outflow = 0.00 cfs @ 13.15 hrs, Volume= 0.002 af, Atten= 93%, Lag= 62.2 min Discarded = 0.00 cfs @ 13.15 hrs, Volume= 0.002 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.24' @ 13.15 hrs Surf.Area= 360 sf Storage= 34 cf Plug-Flow detention time= 113.9 min calculated for 0.002 af (100% of inflow) Center-of-Mass det. time= 113.9 min ( 871.4 - 757.5 ) Volume Invert Avail.Storage Storage Description #1 311.00' 58 cf House - Lot 5 (Conic) Listed below 144 cf Overall x 40.0% Voids 58 cf x 3.00 = 173 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 311.00 120 0 0 120 312.20 120 144 144 167 Device Routing Invert Outlet Devices #1 Primary 312.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 311.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 13.15 hrs HW=311.24' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=311.00' TW=307.40' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 38HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW5a: LOT 5 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Inflow Area=0.009 ac Peak Elev=311.24' Storage=34 cf 0.03 cfs 0.00 cfs0.00 cfs 0.00 cfs Pond DW5a: LOT 5 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)312 311 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 39HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW6: Lot 6 dry well Inflow Area = 0.029 ac,100.00% Impervious, Inflow Depth = 2.84" for 2-Year event Inflow = 0.10 cfs @ 12.11 hrs, Volume= 0.007 af Outflow = 0.01 cfs @ 13.11 hrs, Volume= 0.005 af, Atten= 92%, Lag= 60.0 min Discarded = 0.00 cfs @ 13.11 hrs, Volume= 0.005 af Primary = 0.00 cfs @ 13.11 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 314.00' @ 13.11 hrs Surf.Area= 379 sf Storage= 152 cf Plug-Flow detention time= 381.8 min calculated for 0.005 af (77% of inflow) Center-of-Mass det. time= 292.5 min ( 1,050.0 - 757.5 ) Volume Invert Avail.Storage Storage Description #1 313.00' 182 cf Custom Stage Data (Conic) Listed below 455 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 379 0 0 379 314.20 379 455 455 462 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 13.11 hrs HW=314.00' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 13.11 hrs HW=314.00' TW=310.95' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.00 cfs @ 0.15 fps) NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 40HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW6: Lot 6 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.029 ac Peak Elev=314.00' Storage=152 cf 0.10 cfs 0.01 cfs 0.00 cfs0.00 cfs Pond DW6: Lot 6 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 41HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW8: Lot 8 dry well Inflow Area = 0.029 ac,100.00% Impervious, Inflow Depth = 2.84" for 2-Year event Inflow = 0.10 cfs @ 12.11 hrs, Volume= 0.007 af Outflow = 0.01 cfs @ 13.11 hrs, Volume= 0.005 af, Atten= 92%, Lag= 60.0 min Discarded = 0.00 cfs @ 13.11 hrs, Volume= 0.005 af Primary = 0.00 cfs @ 13.11 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 314.00' @ 13.11 hrs Surf.Area= 379 sf Storage= 152 cf Plug-Flow detention time= 381.8 min calculated for 0.005 af (77% of inflow) Center-of-Mass det. time= 292.5 min ( 1,050.0 - 757.5 ) Volume Invert Avail.Storage Storage Description #1 313.00' 182 cf Custom Stage Data (Conic) Listed below 455 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 379 0 0 379 314.20 379 455 455 462 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 13.11 hrs HW=314.00' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 13.11 hrs HW=314.00' TW=310.95' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.00 cfs @ 0.15 fps) NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 42HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW8: Lot 8 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.029 ac Peak Elev=314.00' Storage=152 cf 0.10 cfs 0.01 cfs 0.00 cfs0.00 cfs Pond DW8: Lot 8 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 43HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond GD3a: Lot 3 gravel diaphragm Inflow Area = 0.024 ac,100.00% Impervious, Inflow Depth = 2.84" for 2-Year event Inflow = 0.08 cfs @ 12.11 hrs, Volume= 0.006 af Outflow = 0.08 cfs @ 12.11 hrs, Volume= 0.005 af, Atten= 0%, Lag= 0.1 min Discarded = 0.00 cfs @ 12.11 hrs, Volume= 0.002 af Primary = 0.08 cfs @ 12.11 hrs, Volume= 0.003 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 310.02' @ 12.11 hrs Surf.Area= 100 sf Storage= 41 cf Plug-Flow detention time= 148.8 min calculated for 0.005 af (90% of inflow) Center-of-Mass det. time= 96.1 min ( 853.7 - 757.5 ) Volume Invert Avail.Storage Storage Description #1 309.00' 48 cf Custom Stage Data (Conic) Listed below 120 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 309.00 100 0 0 100 310.20 100 120 120 143 Device Routing Invert Outlet Devices #1 Primary 310.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 309.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.11 hrs HW=310.02' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.08 cfs @ 12.11 hrs HW=310.02' TW=0.00' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.08 cfs @ 0.38 fps) NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 44HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond GD3a: Lot 3 gravel diaphragm Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.024 ac Peak Elev=310.02' Storage=41 cf 0.08 cfs0.08 cfs 0.00 cfs 0.08 cfs Pond GD3a: Lot 3 gravel diaphragm Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)310 309 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 45HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond GD3b: LOT 3 gravel diaphragm Inflow Area = 0.018 ac,100.00% Impervious, Inflow Depth = 2.84" for 2-Year event Inflow = 0.06 cfs @ 12.11 hrs, Volume= 0.004 af Outflow = 0.06 cfs @ 12.11 hrs, Volume= 0.004 af, Atten= 0%, Lag= 0.2 min Discarded = 0.00 cfs @ 12.11 hrs, Volume= 0.002 af Primary = 0.06 cfs @ 12.11 hrs, Volume= 0.002 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 310.02' @ 12.11 hrs Surf.Area= 110 sf Storage= 45 cf Plug-Flow detention time= 200.6 min calculated for 0.004 af (86% of inflow) Center-of-Mass det. time= 134.0 min ( 891.5 - 757.5 ) Volume Invert Avail.Storage Storage Description #1 309.00' 53 cf Custom Stage Data (Conic) Listed below 132 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 309.00 110 0 0 110 310.20 110 132 132 155 Device Routing Invert Outlet Devices #1 Primary 310.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 309.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.11 hrs HW=310.02' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.06 cfs @ 12.11 hrs HW=310.02' TW=307.48' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.06 cfs @ 0.35 fps) NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 46HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond GD3b: LOT 3 gravel diaphragm Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.018 ac Peak Elev=310.02' Storage=45 cf 0.06 cfs0.06 cfs 0.00 cfs 0.06 cfs Pond GD3b: LOT 3 gravel diaphragm Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)310 309 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 47HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond GD579: Lots 3,4,5,7,9 gravel diaphragms Inflow Area = 0.067 ac,100.00% Impervious, Inflow Depth = 2.84" for 2-Year event Inflow = 0.22 cfs @ 12.11 hrs, Volume= 0.016 af Outflow = 0.22 cfs @ 12.12 hrs, Volume= 0.013 af, Atten= 0%, Lag= 0.3 min Discarded = 0.00 cfs @ 12.12 hrs, Volume= 0.006 af Primary = 0.22 cfs @ 12.12 hrs, Volume= 0.007 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 314.04' @ 12.12 hrs Surf.Area= 408 sf Storage= 170 cf Plug-Flow detention time= 192.6 min calculated for 0.013 af (85% of inflow) Center-of-Mass det. time= 122.0 min ( 879.5 - 757.5 ) Volume Invert Avail.Storage Storage Description #1 313.00' 196 cf Custom Stage Data (Conic) Listed below 490 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 408 0 0 408 314.20 408 490 490 494 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.12 hrs HW=314.04' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.22 cfs @ 12.12 hrs HW=314.04' TW=310.41' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.22 cfs @ 0.54 fps) NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 48HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond GD579: Lots 3,4,5,7,9 gravel diaphragms Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.067 ac Peak Elev=314.04' Storage=170 cf 0.22 cfs0.22 cfs 0.00 cfs 0.22 cfs Pond GD579: Lots 3,4,5,7,9 gravel diaphragms Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 49HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond GD6: LOT 6 gravel diaphragm Inflow Area = 0.047 ac,100.00% Impervious, Inflow Depth = 2.84" for 2-Year event Inflow = 0.16 cfs @ 12.11 hrs, Volume= 0.011 af Outflow = 0.16 cfs @ 12.11 hrs, Volume= 0.010 af, Atten= 0%, Lag= 0.2 min Discarded = 0.00 cfs @ 12.11 hrs, Volume= 0.003 af Primary = 0.15 cfs @ 12.11 hrs, Volume= 0.007 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 314.03' @ 12.11 hrs Surf.Area= 200 sf Storage= 83 cf Plug-Flow detention time= 149.0 min calculated for 0.010 af (90% of inflow) Center-of-Mass det. time= 94.0 min ( 851.5 - 757.5 ) Volume Invert Avail.Storage Storage Description #1 313.00' 96 cf Custom Stage Data (Conic) Listed below 240 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 200 0 0 200 314.20 200 240 240 260 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.11 hrs HW=314.03' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.15 cfs @ 12.11 hrs HW=314.03' TW=310.40' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.15 cfs @ 0.48 fps) NRCC 24-hr C 2-Year Rainfall=3.07"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 50HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond GD6: LOT 6 gravel diaphragm Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.047 ac Peak Elev=314.03' Storage=83 cf 0.16 cfs0.16 cfs 0.00 cfs 0.15 cfs Pond GD6: LOT 6 gravel diaphragm Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 51HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A1: General Drainage Area Runoff = 1.35 cfs @ 12.13 hrs, Volume= 0.088 af, Depth= 2.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description 4,045 98 Paved parking, HSG C 4,064 70 Woods, Good, HSG C 12,186 74 >75% Grass cover, Good, HSG C 20,295 78 Weighted Average 16,250 80.07% Pervious Area 4,045 19.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.9 275 0.0413 0.77 Lag/CN Method, Tc Contour Length= 838' Interval= 1' Subcatchment A1: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)1 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=20,295 sf Runoff Volume=0.088 af Runoff Depth=2.27" Flow Length=275' Slope=0.0413 '/' Tc=5.9 min CN=78 1.35 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 52HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A2: General Drainage Area Runoff = 1.63 cfs @ 12.17 hrs, Volume= 0.124 af, Depth= 1.80" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description 2,148 98 Paved parking, HSG C 26,605 70 Woods, Good, HSG C 7,416 74 >75% Grass cover, Good, HSG C 36,169 72 Weighted Average 34,021 94.06% Pervious Area 2,148 5.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.6 395 0.0395 0.69 Lag/CN Method, Tc Contour Length= 1,430' Interval= 1' Subcatchment A2: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)1 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=36,169 sf Runoff Volume=0.124 af Runoff Depth=1.80" Flow Length=395' Slope=0.0395 '/' Tc=9.6 min CN=72 1.63 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 53HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A3: General Drainage Area Runoff = 0.48 cfs @ 12.13 hrs, Volume= 0.031 af, Depth= 2.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description 173 98 Paved parking, HSG C 7,722 74 >75% Grass cover, Good, HSG C 7,895 75 Weighted Average 7,722 97.81% Pervious Area 173 2.19% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.2 218 0.0442 0.70 Lag/CN Method, Tc Contour Length= 349' Interval= 1' Subcatchment A3: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.54 0.52 0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=7,895 sf Runoff Volume=0.031 af Runoff Depth=2.03" Flow Length=218' Slope=0.0442 '/' Tc=5.2 min CN=75 0.48 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 54HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A4: General Drainage Area Runoff = 0.35 cfs @ 12.12 hrs, Volume= 0.021 af, Depth= 2.11" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description 380 98 Paved parking, HSG C 4,840 74 >75% Grass cover, Good, HSG C 5,220 76 Weighted Average 4,840 92.72% Pervious Area 380 7.28% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment A4: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=5,220 sf Runoff Volume=0.021 af Runoff Depth=2.11" Tc=4.0 min CN=76 0.35 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 55HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A5: General Drainage Area Runoff = 1.50 cfs @ 12.13 hrs, Volume= 0.096 af, Depth= 2.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description 1,710 98 Paved parking, HSG C 2,580 70 Woods, Good, HSG C 20,496 74 >75% Grass cover, Good, HSG C 24,786 75 Weighted Average 23,076 93.10% Pervious Area 1,710 6.90% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.5 248 0.0484 0.75 Lag/CN Method, Tc Contour Length= 1,200' Interval= 1' Subcatchment A5: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)1 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=24,786 sf Runoff Volume=0.096 af Runoff Depth=2.03" Flow Length=248' Slope=0.0484 '/' Tc=5.5 min CN=75 1.50 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 56HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A6: General Drainage Area Runoff = 1.52 cfs @ 12.21 hrs, Volume= 0.130 af, Depth= 1.72" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description 26,444 70 Woods, Good, HSG C 12,866 74 >75% Grass cover, Good, HSG C 96 98 Paved parking, HSG C 39,406 71 Weighted Average 39,310 99.76% Pervious Area 96 0.24% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.5 539 0.0407 0.72 Lag/CN Method, Tc Contour Length= 1,605' Interval= 1' Subcatchment A6: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)1 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=39,406 sf Runoff Volume=0.130 af Runoff Depth=1.72" Flow Length=539' Slope=0.0407 '/' Tc=12.5 min CN=71 1.52 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 57HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment D3a: Lot 3 driveway Runoff = 0.12 cfs @ 12.11 hrs, Volume= 0.008 af, Depth= 4.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description * 1,030 98 driveway 1,030 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment D3a: Lot 3 driveway Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.125 0.12 0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=1,030 sf Runoff Volume=0.008 af Runoff Depth=4.23" Tc=4.0 min CN=98 0.12 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 58HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment D3b: Lot 3 driveway Runoff = 0.09 cfs @ 12.11 hrs, Volume= 0.006 af, Depth= 4.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description * 770 98 driveway 770 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment D3b: Lot 3 driveway Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=770 sf Runoff Volume=0.006 af Runoff Depth=4.23" Tc=4.0 min CN=98 0.09 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 59HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment D5D7: Habitat common driveway and D5 Runoff = 0.33 cfs @ 12.11 hrs, Volume= 0.023 af, Depth= 4.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description * 2,900 98 driveway 2,900 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment D5D7: Habitat common driveway and D5 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=2,900 sf Runoff Volume=0.023 af Runoff Depth=4.23" Tc=4.0 min CN=98 0.33 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 60HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment D6: Lot 4/6 driveway Runoff = 0.23 cfs @ 12.11 hrs, Volume= 0.016 af, Depth= 4.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description * 2,032 98 driveway 2,032 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment D6: Lot 4/6 driveway Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=2,032 sf Runoff Volume=0.016 af Runoff Depth=4.23" Tc=4.0 min CN=98 0.23 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 61HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H3a: House - Lot 3 Runoff = 0.08 cfs @ 12.11 hrs, Volume= 0.006 af, Depth= 4.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description * 722 98 roof 722 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H3a: House - Lot 3 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=722 sf Runoff Volume=0.006 af Runoff Depth=4.23" Tc=4.0 min CN=98 0.08 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 62HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H3b: House - Lot 3 Runoff = 0.06 cfs @ 12.11 hrs, Volume= 0.004 af, Depth= 4.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description * 542 98 roof 542 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H3b: House - Lot 3 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=542 sf Runoff Volume=0.004 af Runoff Depth=4.23" Tc=4.0 min CN=98 0.06 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 63HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H4a: House - Lot 4 Runoff = 0.06 cfs @ 12.11 hrs, Volume= 0.004 af, Depth= 4.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description * 542 98 roof 542 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H4a: House - Lot 4 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=542 sf Runoff Volume=0.004 af Runoff Depth=4.23" Tc=4.0 min CN=98 0.06 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 64HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H4b: House - Lot 4 Runoff = 0.08 cfs @ 12.11 hrs, Volume= 0.006 af, Depth= 4.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description * 722 98 driveway 722 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H4b: House - Lot 4 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=722 sf Runoff Volume=0.006 af Runoff Depth=4.23" Tc=4.0 min CN=98 0.08 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 65HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H579: House - Lot 5a, 7, 9a Runoff = 0.20 cfs @ 12.11 hrs, Volume= 0.015 af, Depth= 4.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description * 1,800 98 driveway 1,800 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H579: House - Lot 5a, 7, 9a Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=1,800 sf Runoff Volume=0.015 af Runoff Depth=4.23" Tc=4.0 min CN=98 0.20 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 66HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H5a: House - Lot 5 Runoff = 0.04 cfs @ 12.11 hrs, Volume= 0.003 af, Depth= 4.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description * 400 98 roof 400 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H5a: House - Lot 5 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.05 0.048 0.046 0.044 0.042 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=400 sf Runoff Volume=0.003 af Runoff Depth=4.23" Tc=4.0 min CN=98 0.04 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 67HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H6: House - Lot 6 Runoff = 0.14 cfs @ 12.11 hrs, Volume= 0.010 af, Depth= 4.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description * 1,264 98 driveway 1,264 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H6: House - Lot 6 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=1,264 sf Runoff Volume=0.010 af Runoff Depth=4.23" Tc=4.0 min CN=98 0.14 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 68HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H8: House - Lot 8 Runoff = 0.14 cfs @ 12.11 hrs, Volume= 0.010 af, Depth= 4.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 10-Year Rainfall=4.47" Area (sf) CN Description * 1,264 98 driveway 1,264 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H8: House - Lot 8 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 10-Year Rainfall=4.47" Runoff Area=1,264 sf Runoff Volume=0.010 af Runoff Depth=4.23" Tc=4.0 min CN=98 0.14 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 69HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Reach CP1: Control Point 1 Inflow Area = 3.392 ac, 15.25% Impervious, Inflow Depth = 1.82" for 10-Year event Inflow = 4.16 cfs @ 12.14 hrs, Volume= 0.514 af Outflow = 4.16 cfs @ 12.14 hrs, Volume= 0.514 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Reach CP1: Control Point 1 Inflow Outflow Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Inflow Area=3.392 ac 4.16 cfs4.16 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 70HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Reach S1: Swale Segment Inflow Area = 2.043 ac, 15.79% Impervious, Inflow Depth = 1.74" for 10-Year event Inflow = 1.24 cfs @ 12.12 hrs, Volume= 0.296 af Outflow = 1.22 cfs @ 12.13 hrs, Volume= 0.296 af, Atten= 2%, Lag= 0.7 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Max. Velocity= 0.99 fps, Min. Travel Time= 1.2 min Avg. Velocity = 0.50 fps, Avg. Travel Time= 2.4 min Peak Storage= 86 cf @ 12.13 hrs Average Depth at Peak Storage= 0.11' Bank-Full Depth= 1.00' Flow Area= 33.3 sf, Capacity= 142.77 cfs 50.00' x 1.00' deep Parabolic Channel, n= 0.030 Earth, grassed & winding Length= 70.0' Slope= 0.0129 '/' Inlet Invert= 307.40', Outlet Invert= 306.50' ‡ Reach S1: Swale Segment Inflow Outflow Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)1 0 Inflow Area=2.043 ac Avg. Flow Depth=0.11' Max Vel=0.99 fps n=0.030 L=70.0' S=0.0129 '/' Capacity=142.77 cfs 1.24 cfs1.22 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 71HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Reach S1: Swale Segment Primary Stage-Discharge Discharge (cfs) 1401301201101009080706050403020100Depth (feet)1 0 NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 72HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Reach S2: Swale Segment Inflow Area = 1.686 ac, 15.07% Impervious, Inflow Depth = 1.71" for 10-Year event Inflow = 0.41 cfs @ 13.06 hrs, Volume= 0.240 af Outflow = 0.41 cfs @ 13.08 hrs, Volume= 0.240 af, Atten= 0%, Lag= 1.2 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Max. Velocity= 0.80 fps, Min. Travel Time= 1.9 min Avg. Velocity = 0.54 fps, Avg. Travel Time= 2.8 min Peak Storage= 47 cf @ 13.08 hrs Average Depth at Peak Storage= 0.06' Bank-Full Depth= 1.00' Flow Area= 33.3 sf, Capacity= 167.89 cfs 50.00' x 1.00' deep Parabolic Channel, n= 0.030 Earth, grassed & winding Length= 90.0' Slope= 0.0178 '/' Inlet Invert= 309.40', Outlet Invert= 307.80' ‡ Reach S2: Swale Segment Inflow Outflow Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=1.686 ac Avg. Flow Depth=0.06' Max Vel=0.80 fps n=0.030 L=90.0' S=0.0178 '/' Capacity=167.89 cfs 0.41 cfs0.41 cfs NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 73HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Reach S2: Swale Segment Primary Stage-Discharge Discharge (cfs) 160140120100806040200Depth (feet)1 0 NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 74HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond 1P: DETENTION AREA - WEST Inflow Area = 1.686 ac, 15.07% Impervious, Inflow Depth = 1.87" for 10-Year event Inflow = 3.65 cfs @ 12.13 hrs, Volume= 0.263 af Outflow = 0.47 cfs @ 13.06 hrs, Volume= 0.263 af, Atten= 87%, Lag= 55.7 min Discarded = 0.06 cfs @ 13.06 hrs, Volume= 0.023 af Primary = 0.41 cfs @ 13.06 hrs, Volume= 0.240 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.60' @ 13.06 hrs Surf.Area= 5,354 sf Storage= 4,231 cf Plug-Flow detention time= 86.2 min calculated for 0.263 af (100% of inflow) Center-of-Mass det. time= 86.2 min ( 936.3 - 850.1 ) Volume Invert Avail.Storage Storage Description #1 309.80' 9,788 cf Custom Stage Data (Irregular) Listed below Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 309.80 5 1.0 0 0 5 310.00 200 65.0 16 16 341 311.00 3,000 250.0 1,325 1,341 4,981 312.00 6,934 395.0 4,832 6,172 12,431 312.50 7,533 404.0 3,616 9,788 13,037 Device Routing Invert Outlet Devices #1 Primary 309.75'12.0" Round Culvert L= 25.0' RCP, groove end w/headwall, Ke= 0.200 Inlet / Outlet Invert= 309.75' / 309.50' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 0.79 sf #2 Device 1 309.80'3.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 311.70'6.0' long x 0.5' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 #4 Discarded 309.80'0.250 in/hr Exfiltration over Wetted area Conductivity to Groundwater Elevation = 300.00' Phase-In= 0.01' Discarded OutFlow Max=0.06 cfs @ 13.06 hrs HW=311.60' (Free Discharge) 4=Exfiltration ( Controls 0.06 cfs) Primary OutFlow Max=0.41 cfs @ 13.06 hrs HW=311.60' TW=309.46' (Dynamic Tailwater) 1=Culvert (Passes 0.41 cfs of 4.69 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.41 cfs @ 6.19 fps) 3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 75HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond 1P: DETENTION AREA - WEST Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Inflow Area=1.686 ac Peak Elev=311.60' Storage=4,231 cf 3.65 cfs 0.47 cfs 0.06 cfs 0.41 cfs Pond 1P: DETENTION AREA - WEST Total Discarded Primary Stage-Discharge Discharge (cfs) 6543210Elevation (feet)312 311 310 Exfiltration Orifice/Grate Broad-Crested Rectangular Weir NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 76HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW3a: Lot 3 house dry well Inflow Area = 0.017 ac,100.00% Impervious, Inflow Depth = 4.23" for 10-Year event Inflow = 0.08 cfs @ 12.11 hrs, Volume= 0.006 af Outflow = 0.00 cfs @ 13.56 hrs, Volume= 0.006 af, Atten= 95%, Lag= 87.1 min Discarded = 0.00 cfs @ 13.56 hrs, Volume= 0.006 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.41' @ 13.56 hrs Surf.Area= 654 sf Storage= 107 cf Plug-Flow detention time= 210.1 min calculated for 0.006 af (100% of inflow) Center-of-Mass det. time= 210.1 min ( 959.6 - 749.6 ) Volume Invert Avail.Storage Storage Description #1 311.00' 105 cf Custom Stage Data (Conic) Listed below 262 cf Overall x 40.0% Voids 105 cf x 3.00 = 314 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 311.00 218 0 0 218 312.20 218 262 262 281 Device Routing Invert Outlet Devices #1 Primary 312.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 311.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 13.56 hrs HW=311.41' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=311.00' TW=0.00' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 77HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW3a: Lot 3 house dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.017 ac Peak Elev=311.41' Storage=107 cf 0.08 cfs 0.00 cfs0.00 cfs 0.00 cfs Pond DW3a: Lot 3 house dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)312 311 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 78HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW3b: Lot 3 house dry well Inflow Area = 0.012 ac,100.00% Impervious, Inflow Depth = 4.23" for 10-Year event Inflow = 0.06 cfs @ 12.11 hrs, Volume= 0.004 af Outflow = 0.00 cfs @ 13.56 hrs, Volume= 0.004 af, Atten= 95%, Lag= 86.7 min Discarded = 0.00 cfs @ 13.56 hrs, Volume= 0.004 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.41' @ 13.56 hrs Surf.Area= 489 sf Storage= 80 cf Plug-Flow detention time= 208.2 min calculated for 0.004 af (100% of inflow) Center-of-Mass det. time= 208.1 min ( 957.7 - 749.6 ) Volume Invert Avail.Storage Storage Description #1 311.00' 78 cf Custom Stage Data (Conic) Listed below 196 cf Overall x 40.0% Voids 78 cf x 3.00 = 235 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 311.00 163 0 0 163 312.20 163 196 196 217 Device Routing Invert Outlet Devices #1 Primary 312.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 311.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 13.56 hrs HW=311.41' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=311.00' TW=307.40' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 79HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW3b: Lot 3 house dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.012 ac Peak Elev=311.41' Storage=80 cf 0.06 cfs 0.00 cfs0.00 cfs 0.00 cfs Pond DW3b: Lot 3 house dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)312 311 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 80HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW4a: Lot 4 dry well Inflow Area = 0.012 ac,100.00% Impervious, Inflow Depth = 4.23" for 10-Year event Inflow = 0.06 cfs @ 12.11 hrs, Volume= 0.004 af Outflow = 0.00 cfs @ 13.56 hrs, Volume= 0.004 af, Atten= 95%, Lag= 86.7 min Discarded = 0.00 cfs @ 13.56 hrs, Volume= 0.004 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.41' @ 13.56 hrs Surf.Area= 489 sf Storage= 80 cf Plug-Flow detention time= 208.2 min calculated for 0.004 af (100% of inflow) Center-of-Mass det. time= 208.1 min ( 957.7 - 749.6 ) Volume Invert Avail.Storage Storage Description #1 311.00' 78 cf Custom Stage Data (Conic) Listed below 196 cf Overall x 40.0% Voids 78 cf x 3.00 = 235 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 311.00 163 0 0 163 312.20 163 196 196 217 Device Routing Invert Outlet Devices #1 Primary 312.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 311.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 13.56 hrs HW=311.41' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=311.00' TW=0.00' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 81HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW4a: Lot 4 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.012 ac Peak Elev=311.41' Storage=80 cf 0.06 cfs 0.00 cfs0.00 cfs 0.00 cfs Pond DW4a: Lot 4 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)312 311 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 82HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW4b: LOT 4 dry well Inflow Area = 0.017 ac,100.00% Impervious, Inflow Depth = 4.23" for 10-Year event Inflow = 0.08 cfs @ 12.11 hrs, Volume= 0.006 af Outflow = 0.00 cfs @ 13.57 hrs, Volume= 0.006 af, Atten= 95%, Lag= 87.3 min Discarded = 0.00 cfs @ 13.57 hrs, Volume= 0.006 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 313.41' @ 13.57 hrs Surf.Area= 651 sf Storage= 107 cf Plug-Flow detention time= 211.5 min calculated for 0.006 af (100% of inflow) Center-of-Mass det. time= 211.5 min ( 961.1 - 749.6 ) Volume Invert Avail.Storage Storage Description #1 313.00' 104 cf Lot 4 dry well (Conic) Listed below 260 cf Overall x 40.0% Voids 104 cf x 3.00 = 312 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 217 0 0 217 314.20 217 260 260 280 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth 314 Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 13.57 hrs HW=313.41' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=313.00' TW=307.40' (Dynamic Tailwater) 1=314 ( Controls 0.00 cfs) NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 83HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW4b: LOT 4 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.017 ac Peak Elev=313.41' Storage=107 cf 0.08 cfs 0.00 cfs0.00 cfs 0.00 cfs Pond DW4b: LOT 4 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration 314 NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 84HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW579: Lot 5,7,9 dry wells Inflow Area = 0.041 ac,100.00% Impervious, Inflow Depth = 4.23" for 10-Year event Inflow = 0.20 cfs @ 12.11 hrs, Volume= 0.015 af Outflow = 0.19 cfs @ 12.13 hrs, Volume= 0.012 af, Atten= 6%, Lag= 1.4 min Discarded = 0.00 cfs @ 12.13 hrs, Volume= 0.008 af Primary = 0.19 cfs @ 12.13 hrs, Volume= 0.004 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 313.04' @ 12.13 hrs Surf.Area= 540 sf Storage= 224 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 177.1 min ( 926.7 - 749.6 ) Volume Invert Avail.Storage Storage Description #1 312.00' 259 cf Custom Stage Data (Conic) Listed below 648 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 312.00 540 0 0 540 313.20 540 648 648 639 Device Routing Invert Outlet Devices #1 Discarded 312.00'0.250 in/hr Exfiltration over Wetted area #2 Primary 313.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 Discarded OutFlow Max=0.00 cfs @ 12.13 hrs HW=313.04' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.18 cfs @ 12.13 hrs HW=313.04' TW=311.10' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir (Weir Controls 0.18 cfs @ 0.51 fps) NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 85HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW579: Lot 5,7,9 dry wells Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.041 ac Peak Elev=313.04' Storage=224 cf 0.20 cfs 0.19 cfs 0.00 cfs 0.19 cfs Pond DW579: Lot 5,7,9 dry wells Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)313 312 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 86HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW5a: LOT 5 dry well Inflow Area = 0.009 ac,100.00% Impervious, Inflow Depth = 4.23" for 10-Year event Inflow = 0.04 cfs @ 12.11 hrs, Volume= 0.003 af Outflow = 0.00 cfs @ 13.55 hrs, Volume= 0.003 af, Atten= 95%, Lag= 86.2 min Discarded = 0.00 cfs @ 13.55 hrs, Volume= 0.003 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.41' @ 13.55 hrs Surf.Area= 360 sf Storage= 59 cf Plug-Flow detention time= 205.1 min calculated for 0.003 af (100% of inflow) Center-of-Mass det. time= 205.1 min ( 954.6 - 749.6 ) Volume Invert Avail.Storage Storage Description #1 311.00' 58 cf House - Lot 5 (Conic) Listed below 144 cf Overall x 40.0% Voids 58 cf x 3.00 = 173 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 311.00 120 0 0 120 312.20 120 144 144 167 Device Routing Invert Outlet Devices #1 Primary 312.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 311.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 13.55 hrs HW=311.41' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=311.00' TW=307.40' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 87HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW5a: LOT 5 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.05 0.048 0.046 0.044 0.042 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Inflow Area=0.009 ac Peak Elev=311.41' Storage=59 cf 0.04 cfs 0.00 cfs0.00 cfs 0.00 cfs Pond DW5a: LOT 5 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)312 311 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 88HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW6: Lot 6 dry well Inflow Area = 0.029 ac,100.00% Impervious, Inflow Depth = 4.23" for 10-Year event Inflow = 0.14 cfs @ 12.11 hrs, Volume= 0.010 af Outflow = 0.14 cfs @ 12.13 hrs, Volume= 0.008 af, Atten= 3%, Lag= 1.0 min Discarded = 0.00 cfs @ 12.13 hrs, Volume= 0.005 af Primary = 0.13 cfs @ 12.13 hrs, Volume= 0.003 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 314.03' @ 12.13 hrs Surf.Area= 379 sf Storage= 156 cf Plug-Flow detention time= 262.7 min calculated for 0.008 af (81% of inflow) Center-of-Mass det. time= 181.9 min ( 931.5 - 749.6 ) Volume Invert Avail.Storage Storage Description #1 313.00' 182 cf Custom Stage Data (Conic) Listed below 455 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 379 0 0 379 314.20 379 455 455 462 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.13 hrs HW=314.03' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.13 cfs @ 12.13 hrs HW=314.03' TW=311.09' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.13 cfs @ 0.46 fps) NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 89HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW6: Lot 6 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.029 ac Peak Elev=314.03' Storage=156 cf 0.14 cfs 0.14 cfs 0.00 cfs 0.13 cfs Pond DW6: Lot 6 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 90HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW8: Lot 8 dry well Inflow Area = 0.029 ac,100.00% Impervious, Inflow Depth = 4.23" for 10-Year event Inflow = 0.14 cfs @ 12.11 hrs, Volume= 0.010 af Outflow = 0.14 cfs @ 12.13 hrs, Volume= 0.008 af, Atten= 3%, Lag= 1.0 min Discarded = 0.00 cfs @ 12.13 hrs, Volume= 0.005 af Primary = 0.13 cfs @ 12.13 hrs, Volume= 0.003 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 314.03' @ 12.13 hrs Surf.Area= 379 sf Storage= 156 cf Plug-Flow detention time= 262.7 min calculated for 0.008 af (81% of inflow) Center-of-Mass det. time= 181.9 min ( 931.5 - 749.6 ) Volume Invert Avail.Storage Storage Description #1 313.00' 182 cf Custom Stage Data (Conic) Listed below 455 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 379 0 0 379 314.20 379 455 455 462 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.13 hrs HW=314.03' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.13 cfs @ 12.13 hrs HW=314.03' TW=311.09' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.13 cfs @ 0.46 fps) NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 91HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW8: Lot 8 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.029 ac Peak Elev=314.03' Storage=156 cf 0.14 cfs 0.14 cfs 0.00 cfs 0.13 cfs Pond DW8: Lot 8 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 92HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond GD3a: Lot 3 gravel diaphragm Inflow Area = 0.024 ac,100.00% Impervious, Inflow Depth = 4.23" for 10-Year event Inflow = 0.12 cfs @ 12.11 hrs, Volume= 0.008 af Outflow = 0.12 cfs @ 12.11 hrs, Volume= 0.008 af, Atten= 0%, Lag= 0.1 min Discarded = 0.00 cfs @ 12.11 hrs, Volume= 0.002 af Primary = 0.11 cfs @ 12.11 hrs, Volume= 0.006 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 310.03' @ 12.11 hrs Surf.Area= 100 sf Storage= 41 cf Plug-Flow detention time= 113.8 min calculated for 0.008 af (93% of inflow) Center-of-Mass det. time= 75.1 min ( 824.7 - 749.6 ) Volume Invert Avail.Storage Storage Description #1 309.00' 48 cf Custom Stage Data (Conic) Listed below 120 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 309.00 100 0 0 100 310.20 100 120 120 143 Device Routing Invert Outlet Devices #1 Primary 310.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 309.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.11 hrs HW=310.03' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.11 cfs @ 12.11 hrs HW=310.03' TW=0.00' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.11 cfs @ 0.44 fps) NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 93HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond GD3a: Lot 3 gravel diaphragm Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.125 0.12 0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.024 ac Peak Elev=310.03' Storage=41 cf 0.12 cfs0.12 cfs 0.00 cfs 0.11 cfs Pond GD3a: Lot 3 gravel diaphragm Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)310 309 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 94HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond GD3b: LOT 3 gravel diaphragm Inflow Area = 0.018 ac,100.00% Impervious, Inflow Depth = 4.23" for 10-Year event Inflow = 0.09 cfs @ 12.11 hrs, Volume= 0.006 af Outflow = 0.09 cfs @ 12.11 hrs, Volume= 0.006 af, Atten= 0%, Lag= 0.1 min Discarded = 0.00 cfs @ 12.11 hrs, Volume= 0.002 af Primary = 0.09 cfs @ 12.11 hrs, Volume= 0.004 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 310.02' @ 12.11 hrs Surf.Area= 110 sf Storage= 45 cf Plug-Flow detention time= 149.8 min calculated for 0.006 af (90% of inflow) Center-of-Mass det. time= 97.0 min ( 846.6 - 749.6 ) Volume Invert Avail.Storage Storage Description #1 309.00' 53 cf Custom Stage Data (Conic) Listed below 132 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 309.00 110 0 0 110 310.20 110 132 132 155 Device Routing Invert Outlet Devices #1 Primary 310.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 309.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.11 hrs HW=310.02' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.09 cfs @ 12.11 hrs HW=310.02' TW=307.51' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.09 cfs @ 0.40 fps) NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 95HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond GD3b: LOT 3 gravel diaphragm Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.018 ac Peak Elev=310.02' Storage=45 cf 0.09 cfs0.09 cfs 0.00 cfs 0.09 cfs Pond GD3b: LOT 3 gravel diaphragm Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)310 309 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 96HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond GD579: Lots 3,4,5,7,9 gravel diaphragms Inflow Area = 0.067 ac,100.00% Impervious, Inflow Depth = 4.23" for 10-Year event Inflow = 0.33 cfs @ 12.11 hrs, Volume= 0.023 af Outflow = 0.33 cfs @ 12.12 hrs, Volume= 0.021 af, Atten= 0%, Lag= 0.3 min Discarded = 0.00 cfs @ 12.12 hrs, Volume= 0.006 af Primary = 0.32 cfs @ 12.12 hrs, Volume= 0.015 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 314.05' @ 12.12 hrs Surf.Area= 408 sf Storage= 172 cf Plug-Flow detention time= 146.1 min calculated for 0.021 af (90% of inflow) Center-of-Mass det. time= 91.4 min ( 841.0 - 749.6 ) Volume Invert Avail.Storage Storage Description #1 313.00' 196 cf Custom Stage Data (Conic) Listed below 490 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 408 0 0 408 314.20 408 490 490 494 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.12 hrs HW=314.05' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.32 cfs @ 12.12 hrs HW=314.05' TW=311.06' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.32 cfs @ 0.62 fps) NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 97HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond GD579: Lots 3,4,5,7,9 gravel diaphragms Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.067 ac Peak Elev=314.05' Storage=172 cf 0.33 cfs0.33 cfs 0.00 cfs 0.32 cfs Pond GD579: Lots 3,4,5,7,9 gravel diaphragms Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 98HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond GD6: LOT 6 gravel diaphragm Inflow Area = 0.047 ac,100.00% Impervious, Inflow Depth = 4.23" for 10-Year event Inflow = 0.23 cfs @ 12.11 hrs, Volume= 0.016 af Outflow = 0.23 cfs @ 12.11 hrs, Volume= 0.015 af, Atten= 0%, Lag= 0.2 min Discarded = 0.00 cfs @ 12.11 hrs, Volume= 0.003 af Primary = 0.23 cfs @ 12.11 hrs, Volume= 0.012 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 314.04' @ 12.11 hrs Surf.Area= 200 sf Storage= 83 cf Plug-Flow detention time= 114.3 min calculated for 0.015 af (93% of inflow) Center-of-Mass det. time= 73.9 min ( 823.4 - 749.6 ) Volume Invert Avail.Storage Storage Description #1 313.00' 96 cf Custom Stage Data (Conic) Listed below 240 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 200 0 0 200 314.20 200 240 240 260 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.11 hrs HW=314.04' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.23 cfs @ 12.11 hrs HW=314.04' TW=311.05' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.23 cfs @ 0.55 fps) NRCC 24-hr C 10-Year Rainfall=4.47"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 99HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond GD6: LOT 6 gravel diaphragm Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.047 ac Peak Elev=314.04' Storage=83 cf 0.23 cfs0.23 cfs 0.00 cfs 0.23 cfs Pond GD6: LOT 6 gravel diaphragm Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 100HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A1: General Drainage Area Runoff = 2.97 cfs @ 12.13 hrs, Volume= 0.198 af, Depth= 5.10" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description 4,045 98 Paved parking, HSG C 4,064 70 Woods, Good, HSG C 12,186 74 >75% Grass cover, Good, HSG C 20,295 78 Weighted Average 16,250 80.07% Pervious Area 4,045 19.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.9 275 0.0413 0.77 Lag/CN Method, Tc Contour Length= 838' Interval= 1' Subcatchment A1: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)3 2 1 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=20,295 sf Runoff Volume=0.198 af Runoff Depth=5.10" Flow Length=275' Slope=0.0413 '/' Tc=5.9 min CN=78 2.97 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 101HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A2: General Drainage Area Runoff = 4.02 cfs @ 12.17 hrs, Volume= 0.305 af, Depth= 4.41" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description 2,148 98 Paved parking, HSG C 26,605 70 Woods, Good, HSG C 7,416 74 >75% Grass cover, Good, HSG C 36,169 72 Weighted Average 34,021 94.06% Pervious Area 2,148 5.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.6 395 0.0395 0.69 Lag/CN Method, Tc Contour Length= 1,430' Interval= 1' Subcatchment A2: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=36,169 sf Runoff Volume=0.305 af Runoff Depth=4.41" Flow Length=395' Slope=0.0395 '/' Tc=9.6 min CN=72 4.02 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 102HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A3: General Drainage Area Runoff = 1.12 cfs @ 12.12 hrs, Volume= 0.072 af, Depth= 4.75" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description 173 98 Paved parking, HSG C 7,722 74 >75% Grass cover, Good, HSG C 7,895 75 Weighted Average 7,722 97.81% Pervious Area 173 2.19% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.2 218 0.0442 0.70 Lag/CN Method, Tc Contour Length= 349' Interval= 1' Subcatchment A3: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)1 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=7,895 sf Runoff Volume=0.072 af Runoff Depth=4.75" Flow Length=218' Slope=0.0442 '/' Tc=5.2 min CN=75 1.12 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 103HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A4: General Drainage Area Runoff = 0.78 cfs @ 12.11 hrs, Volume= 0.049 af, Depth= 4.87" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description 380 98 Paved parking, HSG C 4,840 74 >75% Grass cover, Good, HSG C 5,220 76 Weighted Average 4,840 92.72% Pervious Area 380 7.28% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment A4: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=5,220 sf Runoff Volume=0.049 af Runoff Depth=4.87" Tc=4.0 min CN=76 0.78 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 104HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A5: General Drainage Area Runoff = 3.47 cfs @ 12.13 hrs, Volume= 0.225 af, Depth= 4.75" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description 1,710 98 Paved parking, HSG C 2,580 70 Woods, Good, HSG C 20,496 74 >75% Grass cover, Good, HSG C 24,786 75 Weighted Average 23,076 93.10% Pervious Area 1,710 6.90% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.5 248 0.0484 0.75 Lag/CN Method, Tc Contour Length= 1,200' Interval= 1' Subcatchment A5: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)3 2 1 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=24,786 sf Runoff Volume=0.225 af Runoff Depth=4.75" Flow Length=248' Slope=0.0484 '/' Tc=5.5 min CN=75 3.47 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 105HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment A6: General Drainage Area Runoff = 3.85 cfs @ 12.21 hrs, Volume= 0.324 af, Depth= 4.30" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description 26,444 70 Woods, Good, HSG C 12,866 74 >75% Grass cover, Good, HSG C 96 98 Paved parking, HSG C 39,406 71 Weighted Average 39,310 99.76% Pervious Area 96 0.24% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.5 539 0.0407 0.72 Lag/CN Method, Tc Contour Length= 1,605' Interval= 1' Subcatchment A6: General Drainage Area Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=39,406 sf Runoff Volume=0.324 af Runoff Depth=4.30" Flow Length=539' Slope=0.0407 '/' Tc=12.5 min CN=71 3.85 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 106HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment D3a: Lot 3 driveway Runoff = 0.20 cfs @ 12.11 hrs, Volume= 0.015 af, Depth= 7.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description * 1,030 98 driveway 1,030 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment D3a: Lot 3 driveway Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=1,030 sf Runoff Volume=0.015 af Runoff Depth=7.44" Tc=4.0 min CN=98 0.20 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 107HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment D3b: Lot 3 driveway Runoff = 0.15 cfs @ 12.11 hrs, Volume= 0.011 af, Depth= 7.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description * 770 98 driveway 770 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment D3b: Lot 3 driveway Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=770 sf Runoff Volume=0.011 af Runoff Depth=7.44" Tc=4.0 min CN=98 0.15 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 108HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment D5D7: Habitat common driveway and D5 Runoff = 0.56 cfs @ 12.11 hrs, Volume= 0.041 af, Depth= 7.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description * 2,900 98 driveway 2,900 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment D5D7: Habitat common driveway and D5 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=2,900 sf Runoff Volume=0.041 af Runoff Depth=7.44" Tc=4.0 min CN=98 0.56 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 109HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment D6: Lot 4/6 driveway Runoff = 0.39 cfs @ 12.11 hrs, Volume= 0.029 af, Depth= 7.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description * 2,032 98 driveway 2,032 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment D6: Lot 4/6 driveway Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=2,032 sf Runoff Volume=0.029 af Runoff Depth=7.44" Tc=4.0 min CN=98 0.39 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 110HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H3a: House - Lot 3 Runoff = 0.14 cfs @ 12.11 hrs, Volume= 0.010 af, Depth= 7.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description * 722 98 roof 722 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H3a: House - Lot 3 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=722 sf Runoff Volume=0.010 af Runoff Depth=7.44" Tc=4.0 min CN=98 0.14 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 111HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H3b: House - Lot 3 Runoff = 0.11 cfs @ 12.11 hrs, Volume= 0.008 af, Depth= 7.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description * 542 98 roof 542 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H3b: House - Lot 3 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=542 sf Runoff Volume=0.008 af Runoff Depth=7.44" Tc=4.0 min CN=98 0.11 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 112HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H4a: House - Lot 4 Runoff = 0.11 cfs @ 12.11 hrs, Volume= 0.008 af, Depth= 7.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description * 542 98 roof 542 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H4a: House - Lot 4 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=542 sf Runoff Volume=0.008 af Runoff Depth=7.44" Tc=4.0 min CN=98 0.11 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 113HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H4b: House - Lot 4 Runoff = 0.14 cfs @ 12.11 hrs, Volume= 0.010 af, Depth= 7.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description * 722 98 driveway 722 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H4b: House - Lot 4 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=722 sf Runoff Volume=0.010 af Runoff Depth=7.44" Tc=4.0 min CN=98 0.14 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 114HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H579: House - Lot 5a, 7, 9a Runoff = 0.35 cfs @ 12.11 hrs, Volume= 0.026 af, Depth= 7.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description * 1,800 98 driveway 1,800 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H579: House - Lot 5a, 7, 9a Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=1,800 sf Runoff Volume=0.026 af Runoff Depth=7.44" Tc=4.0 min CN=98 0.35 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 115HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H5a: House - Lot 5 Runoff = 0.08 cfs @ 12.11 hrs, Volume= 0.006 af, Depth= 7.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description * 400 98 roof 400 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H5a: House - Lot 5 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=400 sf Runoff Volume=0.006 af Runoff Depth=7.44" Tc=4.0 min CN=98 0.08 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 116HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H6: House - Lot 6 Runoff = 0.25 cfs @ 12.11 hrs, Volume= 0.018 af, Depth= 7.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description * 1,264 98 driveway 1,264 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H6: House - Lot 6 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.27 0.26 0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=1,264 sf Runoff Volume=0.018 af Runoff Depth=7.44" Tc=4.0 min CN=98 0.25 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 117HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment H8: House - Lot 8 Runoff = 0.25 cfs @ 12.11 hrs, Volume= 0.018 af, Depth= 7.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NRCC 24-hr C 100-Year Rainfall=7.68" Area (sf) CN Description * 1,264 98 driveway 1,264 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 Direct Entry, Subcatchment H8: House - Lot 8 Runoff Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.27 0.26 0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 NRCC 24-hr C 100-Year Rainfall=7.68" Runoff Area=1,264 sf Runoff Volume=0.018 af Runoff Depth=7.44" Tc=4.0 min CN=98 0.25 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 118HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Reach CP1: Control Point 1 Inflow Area = 3.392 ac, 15.25% Impervious, Inflow Depth = 4.39" for 100-Year event Inflow = 11.52 cfs @ 12.17 hrs, Volume= 1.242 af Outflow = 11.52 cfs @ 12.17 hrs, Volume= 1.242 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Reach CP1: Control Point 1 Inflow Outflow Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=3.392 ac 11.52 cfs11.52 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 119HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Reach S1: Swale Segment Inflow Area = 2.043 ac, 15.79% Impervious, Inflow Depth = 4.27" for 100-Year event Inflow = 5.85 cfs @ 12.25 hrs, Volume= 0.726 af Outflow = 5.85 cfs @ 12.26 hrs, Volume= 0.726 af, Atten= 0%, Lag= 0.5 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Max. Velocity= 1.60 fps, Min. Travel Time= 0.7 min Avg. Velocity = 0.59 fps, Avg. Travel Time= 2.0 min Peak Storage= 255 cf @ 12.26 hrs Average Depth at Peak Storage= 0.23' Bank-Full Depth= 1.00' Flow Area= 33.3 sf, Capacity= 142.77 cfs 50.00' x 1.00' deep Parabolic Channel, n= 0.030 Earth, grassed & winding Length= 70.0' Slope= 0.0129 '/' Inlet Invert= 307.40', Outlet Invert= 306.50' ‡ Reach S1: Swale Segment Inflow Outflow Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)6 5 4 3 2 1 0 Inflow Area=2.043 ac Avg. Flow Depth=0.23' Max Vel=1.60 fps n=0.030 L=70.0' S=0.0129 '/' Capacity=142.77 cfs 5.85 cfs5.85 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 120HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Reach S1: Swale Segment Primary Stage-Discharge Discharge (cfs) 1401301201101009080706050403020100Depth (feet)1 0 NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 121HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Reach S2: Swale Segment Inflow Area = 1.686 ac, 15.07% Impervious, Inflow Depth = 4.25" for 100-Year event Inflow = 5.19 cfs @ 12.26 hrs, Volume= 0.597 af Outflow = 5.17 cfs @ 12.27 hrs, Volume= 0.597 af, Atten= 0%, Lag= 0.6 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Max. Velocity= 1.73 fps, Min. Travel Time= 0.9 min Avg. Velocity = 0.64 fps, Avg. Travel Time= 2.3 min Peak Storage= 270 cf @ 12.27 hrs Average Depth at Peak Storage= 0.20' Bank-Full Depth= 1.00' Flow Area= 33.3 sf, Capacity= 167.89 cfs 50.00' x 1.00' deep Parabolic Channel, n= 0.030 Earth, grassed & winding Length= 90.0' Slope= 0.0178 '/' Inlet Invert= 309.40', Outlet Invert= 307.80' ‡ Reach S2: Swale Segment Inflow Outflow Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)5 4 3 2 1 0 Inflow Area=1.686 ac Avg. Flow Depth=0.20' Max Vel=1.73 fps n=0.030 L=90.0' S=0.0178 '/' Capacity=167.89 cfs 5.19 cfs5.17 cfs NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 122HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Reach S2: Swale Segment Primary Stage-Discharge Discharge (cfs) 160140120100806040200Depth (feet)1 0 NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 123HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond 1P: DETENTION AREA - WEST Inflow Area = 1.686 ac, 15.07% Impervious, Inflow Depth = 4.56" for 100-Year event Inflow = 8.27 cfs @ 12.13 hrs, Volume= 0.641 af Outflow = 5.27 cfs @ 12.26 hrs, Volume= 0.641 af, Atten= 36%, Lag= 7.5 min Discarded = 0.08 cfs @ 12.26 hrs, Volume= 0.043 af Primary = 5.19 cfs @ 12.26 hrs, Volume= 0.597 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 312.12' @ 12.26 hrs Surf.Area= 7,072 sf Storage= 7,007 cf Plug-Flow detention time= 73.7 min calculated for 0.640 af (100% of inflow) Center-of-Mass det. time= 73.6 min ( 899.0 - 825.3 ) Volume Invert Avail.Storage Storage Description #1 309.80' 9,788 cf Custom Stage Data (Irregular) Listed below Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 309.80 5 1.0 0 0 5 310.00 200 65.0 16 16 341 311.00 3,000 250.0 1,325 1,341 4,981 312.00 6,934 395.0 4,832 6,172 12,431 312.50 7,533 404.0 3,616 9,788 13,037 Device Routing Invert Outlet Devices #1 Primary 309.75'12.0" Round Culvert L= 25.0' RCP, groove end w/headwall, Ke= 0.200 Inlet / Outlet Invert= 309.75' / 309.50' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 0.79 sf #2 Device 1 309.80'3.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 311.70'6.0' long x 0.5' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 #4 Discarded 309.80'0.250 in/hr Exfiltration over Wetted area Conductivity to Groundwater Elevation = 300.00' Phase-In= 0.01' Discarded OutFlow Max=0.08 cfs @ 12.26 hrs HW=312.12' (Free Discharge) 4=Exfiltration ( Controls 0.08 cfs) Primary OutFlow Max=5.18 cfs @ 12.26 hrs HW=312.12' TW=309.60' (Dynamic Tailwater) 1=Culvert (Passes 5.18 cfs of 5.69 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.47 cfs @ 7.09 fps) 3=Broad-Crested Rectangular Weir (Weir Controls 4.71 cfs @ 1.89 fps) NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 124HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond 1P: DETENTION AREA - WEST Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)9 8 7 6 5 4 3 2 1 0 Inflow Area=1.686 ac Peak Elev=312.12' Storage=7,007 cf 8.27 cfs 5.27 cfs 0.08 cfs 5.19 cfs Pond 1P: DETENTION AREA - WEST Total Discarded Primary Stage-Discharge Discharge (cfs) 6543210Elevation (feet)312 311 310 Exfiltration Orifice/Grate Broad-Crested Rectangular Weir NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 125HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW3a: Lot 3 house dry well Inflow Area = 0.017 ac,100.00% Impervious, Inflow Depth = 7.44" for 100-Year event Inflow = 0.14 cfs @ 12.11 hrs, Volume= 0.010 af Outflow = 0.00 cfs @ 14.77 hrs, Volume= 0.009 af, Atten= 97%, Lag= 159.5 min Discarded = 0.00 cfs @ 14.77 hrs, Volume= 0.009 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.87' @ 14.77 hrs Surf.Area= 654 sf Storage= 227 cf Plug-Flow detention time= 378.9 min calculated for 0.009 af (85% of inflow) Center-of-Mass det. time= 308.3 min ( 1,049.0 - 740.8 ) Volume Invert Avail.Storage Storage Description #1 311.00' 105 cf Custom Stage Data (Conic) Listed below 262 cf Overall x 40.0% Voids 105 cf x 3.00 = 314 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 311.00 218 0 0 218 312.20 218 262 262 281 Device Routing Invert Outlet Devices #1 Primary 312.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 311.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 14.77 hrs HW=311.87' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=311.00' TW=0.00' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 126HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW3a: Lot 3 house dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.017 ac Peak Elev=311.87' Storage=227 cf 0.14 cfs 0.00 cfs0.00 cfs0.00 cfs Pond DW3a: Lot 3 house dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)312 311 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 127HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW3b: Lot 3 house dry well Inflow Area = 0.012 ac,100.00% Impervious, Inflow Depth = 7.44" for 100-Year event Inflow = 0.11 cfs @ 12.11 hrs, Volume= 0.008 af Outflow = 0.00 cfs @ 14.74 hrs, Volume= 0.007 af, Atten= 97%, Lag= 157.5 min Discarded = 0.00 cfs @ 14.74 hrs, Volume= 0.007 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.87' @ 14.74 hrs Surf.Area= 489 sf Storage= 169 cf Plug-Flow detention time= 376.8 min calculated for 0.007 af (86% of inflow) Center-of-Mass det. time= 309.2 min ( 1,049.9 - 740.8 ) Volume Invert Avail.Storage Storage Description #1 311.00' 78 cf Custom Stage Data (Conic) Listed below 196 cf Overall x 40.0% Voids 78 cf x 3.00 = 235 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 311.00 163 0 0 163 312.20 163 196 196 217 Device Routing Invert Outlet Devices #1 Primary 312.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 311.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 14.74 hrs HW=311.87' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=311.00' TW=307.40' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 128HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW3b: Lot 3 house dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.012 ac Peak Elev=311.87' Storage=169 cf 0.11 cfs 0.00 cfs0.00 cfs 0.00 cfs Pond DW3b: Lot 3 house dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)312 311 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 129HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW4a: Lot 4 dry well Inflow Area = 0.012 ac,100.00% Impervious, Inflow Depth = 7.44" for 100-Year event Inflow = 0.11 cfs @ 12.11 hrs, Volume= 0.008 af Outflow = 0.00 cfs @ 14.74 hrs, Volume= 0.007 af, Atten= 97%, Lag= 157.5 min Discarded = 0.00 cfs @ 14.74 hrs, Volume= 0.007 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.87' @ 14.74 hrs Surf.Area= 489 sf Storage= 169 cf Plug-Flow detention time= 376.8 min calculated for 0.007 af (86% of inflow) Center-of-Mass det. time= 309.2 min ( 1,049.9 - 740.8 ) Volume Invert Avail.Storage Storage Description #1 311.00' 78 cf Custom Stage Data (Conic) Listed below 196 cf Overall x 40.0% Voids 78 cf x 3.00 = 235 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 311.00 163 0 0 163 312.20 163 196 196 217 Device Routing Invert Outlet Devices #1 Primary 312.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 311.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 14.74 hrs HW=311.87' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=311.00' TW=0.00' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 130HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW4a: Lot 4 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.012 ac Peak Elev=311.87' Storage=169 cf 0.11 cfs 0.00 cfs0.00 cfs 0.00 cfs Pond DW4a: Lot 4 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)312 311 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 131HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW4b: LOT 4 dry well Inflow Area = 0.017 ac,100.00% Impervious, Inflow Depth = 7.44" for 100-Year event Inflow = 0.14 cfs @ 12.11 hrs, Volume= 0.010 af Outflow = 0.00 cfs @ 14.77 hrs, Volume= 0.009 af, Atten= 97%, Lag= 159.8 min Discarded = 0.00 cfs @ 14.77 hrs, Volume= 0.009 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 313.87' @ 14.77 hrs Surf.Area= 651 sf Storage= 227 cf Plug-Flow detention time= 379.4 min calculated for 0.009 af (85% of inflow) Center-of-Mass det. time= 308.0 min ( 1,048.8 - 740.8 ) Volume Invert Avail.Storage Storage Description #1 313.00' 104 cf Lot 4 dry well (Conic) Listed below 260 cf Overall x 40.0% Voids 104 cf x 3.00 = 312 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 217 0 0 217 314.20 217 260 260 280 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth 314 Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 14.77 hrs HW=313.87' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=313.00' TW=307.40' (Dynamic Tailwater) 1=314 ( Controls 0.00 cfs) NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 132HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW4b: LOT 4 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.017 ac Peak Elev=313.87' Storage=227 cf 0.14 cfs 0.00 cfs0.00 cfs0.00 cfs Pond DW4b: LOT 4 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration 314 NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 133HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW579: Lot 5,7,9 dry wells Inflow Area = 0.041 ac,100.00% Impervious, Inflow Depth = 7.44" for 100-Year event Inflow = 0.35 cfs @ 12.11 hrs, Volume= 0.026 af Outflow = 0.35 cfs @ 12.12 hrs, Volume= 0.022 af, Atten= 0%, Lag= 0.3 min Discarded = 0.00 cfs @ 12.12 hrs, Volume= 0.008 af Primary = 0.34 cfs @ 12.12 hrs, Volume= 0.014 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 313.05' @ 12.12 hrs Surf.Area= 540 sf Storage= 228 cf Plug-Flow detention time= 168.0 min calculated for 0.022 af (87% of inflow) Center-of-Mass det. time= 104.2 min ( 845.0 - 740.8 ) Volume Invert Avail.Storage Storage Description #1 312.00' 259 cf Custom Stage Data (Conic) Listed below 648 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 312.00 540 0 0 540 313.20 540 648 648 639 Device Routing Invert Outlet Devices #1 Discarded 312.00'0.250 in/hr Exfiltration over Wetted area #2 Primary 313.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 Discarded OutFlow Max=0.00 cfs @ 12.12 hrs HW=313.05' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.34 cfs @ 12.12 hrs HW=313.05' TW=311.89' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir (Weir Controls 0.34 cfs @ 0.63 fps) NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 134HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW579: Lot 5,7,9 dry wells Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.041 ac Peak Elev=313.05' Storage=228 cf 0.35 cfs0.35 cfs 0.00 cfs 0.34 cfs Pond DW579: Lot 5,7,9 dry wells Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)313 312 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 135HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW5a: LOT 5 dry well Inflow Area = 0.009 ac,100.00% Impervious, Inflow Depth = 7.44" for 100-Year event Inflow = 0.08 cfs @ 12.11 hrs, Volume= 0.006 af Outflow = 0.00 cfs @ 14.65 hrs, Volume= 0.005 af, Atten= 97%, Lag= 152.6 min Discarded = 0.00 cfs @ 14.65 hrs, Volume= 0.005 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 311.86' @ 14.65 hrs Surf.Area= 360 sf Storage= 124 cf Plug-Flow detention time= 373.5 min calculated for 0.005 af (88% of inflow) Center-of-Mass det. time= 310.1 min ( 1,050.9 - 740.8 ) Volume Invert Avail.Storage Storage Description #1 311.00' 58 cf House - Lot 5 (Conic) Listed below 144 cf Overall x 40.0% Voids 58 cf x 3.00 = 173 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 311.00 120 0 0 120 312.20 120 144 144 167 Device Routing Invert Outlet Devices #1 Primary 312.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 311.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 14.65 hrs HW=311.86' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=311.00' TW=307.40' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 136HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW5a: LOT 5 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.009 ac Peak Elev=311.86' Storage=124 cf 0.08 cfs 0.00 cfs0.00 cfs 0.00 cfs Pond DW5a: LOT 5 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)312 311 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 137HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW6: Lot 6 dry well Inflow Area = 0.029 ac,100.00% Impervious, Inflow Depth = 7.44" for 100-Year event Inflow = 0.25 cfs @ 12.11 hrs, Volume= 0.018 af Outflow = 0.24 cfs @ 12.12 hrs, Volume= 0.016 af, Atten= 0%, Lag= 0.3 min Discarded = 0.00 cfs @ 12.12 hrs, Volume= 0.006 af Primary = 0.24 cfs @ 12.12 hrs, Volume= 0.010 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 314.04' @ 12.12 hrs Surf.Area= 379 sf Storage= 158 cf Plug-Flow detention time= 169.7 min calculated for 0.016 af (88% of inflow) Center-of-Mass det. time= 106.5 min ( 847.2 - 740.8 ) Volume Invert Avail.Storage Storage Description #1 313.00' 182 cf Custom Stage Data (Conic) Listed below 455 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 379 0 0 379 314.20 379 455 455 462 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.12 hrs HW=314.04' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.24 cfs @ 12.12 hrs HW=314.04' TW=311.89' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.24 cfs @ 0.56 fps) NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 138HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW6: Lot 6 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.27 0.26 0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.029 ac Peak Elev=314.04' Storage=158 cf 0.25 cfs0.24 cfs 0.00 cfs 0.24 cfs Pond DW6: Lot 6 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 139HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond DW8: Lot 8 dry well Inflow Area = 0.029 ac,100.00% Impervious, Inflow Depth = 7.44" for 100-Year event Inflow = 0.25 cfs @ 12.11 hrs, Volume= 0.018 af Outflow = 0.24 cfs @ 12.12 hrs, Volume= 0.016 af, Atten= 0%, Lag= 0.3 min Discarded = 0.00 cfs @ 12.12 hrs, Volume= 0.006 af Primary = 0.24 cfs @ 12.12 hrs, Volume= 0.010 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 314.04' @ 12.12 hrs Surf.Area= 379 sf Storage= 158 cf Plug-Flow detention time= 169.7 min calculated for 0.016 af (88% of inflow) Center-of-Mass det. time= 106.5 min ( 847.2 - 740.8 ) Volume Invert Avail.Storage Storage Description #1 313.00' 182 cf Custom Stage Data (Conic) Listed below 455 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 379 0 0 379 314.20 379 455 455 462 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.12 hrs HW=314.04' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.24 cfs @ 12.12 hrs HW=314.04' TW=311.89' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.24 cfs @ 0.56 fps) NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 140HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond DW8: Lot 8 dry well Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.27 0.26 0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.029 ac Peak Elev=314.04' Storage=158 cf 0.25 cfs0.24 cfs 0.00 cfs 0.24 cfs Pond DW8: Lot 8 dry well Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 141HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond GD3a: Lot 3 gravel diaphragm Inflow Area = 0.024 ac,100.00% Impervious, Inflow Depth = 7.44" for 100-Year event Inflow = 0.20 cfs @ 12.11 hrs, Volume= 0.015 af Outflow = 0.20 cfs @ 12.11 hrs, Volume= 0.014 af, Atten= 0%, Lag= 0.1 min Discarded = 0.00 cfs @ 12.11 hrs, Volume= 0.002 af Primary = 0.20 cfs @ 12.11 hrs, Volume= 0.012 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 310.04' @ 12.11 hrs Surf.Area= 100 sf Storage= 42 cf Plug-Flow detention time= 76.3 min calculated for 0.014 af (96% of inflow) Center-of-Mass det. time= 52.2 min ( 793.0 - 740.8 ) Volume Invert Avail.Storage Storage Description #1 309.00' 48 cf Custom Stage Data (Conic) Listed below 120 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 309.00 100 0 0 100 310.20 100 120 120 143 Device Routing Invert Outlet Devices #1 Primary 310.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 309.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.11 hrs HW=310.04' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.20 cfs @ 12.11 hrs HW=310.04' TW=0.00' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.20 cfs @ 0.52 fps) NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 142HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond GD3a: Lot 3 gravel diaphragm Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.024 ac Peak Elev=310.04' Storage=42 cf 0.20 cfs0.20 cfs 0.00 cfs 0.20 cfs Pond GD3a: Lot 3 gravel diaphragm Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)310 309 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 143HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond GD3b: LOT 3 gravel diaphragm Inflow Area = 0.018 ac,100.00% Impervious, Inflow Depth = 7.44" for 100-Year event Inflow = 0.15 cfs @ 12.11 hrs, Volume= 0.011 af Outflow = 0.15 cfs @ 12.11 hrs, Volume= 0.010 af, Atten= 0%, Lag= 0.1 min Discarded = 0.00 cfs @ 12.11 hrs, Volume= 0.002 af Primary = 0.15 cfs @ 12.11 hrs, Volume= 0.008 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 310.03' @ 12.11 hrs Surf.Area= 110 sf Storage= 45 cf Plug-Flow detention time= 103.2 min calculated for 0.010 af (94% of inflow) Center-of-Mass det. time= 69.3 min ( 810.0 - 740.8 ) Volume Invert Avail.Storage Storage Description #1 309.00' 53 cf Custom Stage Data (Conic) Listed below 132 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 309.00 110 0 0 110 310.20 110 132 132 155 Device Routing Invert Outlet Devices #1 Primary 310.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 309.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.11 hrs HW=310.03' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.15 cfs @ 12.11 hrs HW=310.03' TW=307.56' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.15 cfs @ 0.47 fps) NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 144HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond GD3b: LOT 3 gravel diaphragm Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.018 ac Peak Elev=310.03' Storage=45 cf 0.15 cfs0.15 cfs 0.00 cfs 0.15 cfs Pond GD3b: LOT 3 gravel diaphragm Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)310 309 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 145HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond GD579: Lots 3,4,5,7,9 gravel diaphragms Inflow Area = 0.067 ac,100.00% Impervious, Inflow Depth = 7.44" for 100-Year event Inflow = 0.56 cfs @ 12.11 hrs, Volume= 0.041 af Outflow = 0.56 cfs @ 12.12 hrs, Volume= 0.039 af, Atten= 0%, Lag= 0.3 min Discarded = 0.00 cfs @ 12.12 hrs, Volume= 0.006 af Primary = 0.56 cfs @ 12.12 hrs, Volume= 0.032 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 314.08' @ 12.12 hrs Surf.Area= 408 sf Storage= 176 cf Plug-Flow detention time= 101.5 min calculated for 0.039 af (94% of inflow) Center-of-Mass det. time= 66.2 min ( 807.0 - 740.8 ) Volume Invert Avail.Storage Storage Description #1 313.00' 196 cf Custom Stage Data (Conic) Listed below 490 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 408 0 0 408 314.20 408 490 490 494 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.12 hrs HW=314.08' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.56 cfs @ 12.12 hrs HW=314.08' TW=311.89' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.56 cfs @ 0.74 fps) NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 146HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond GD579: Lots 3,4,5,7,9 gravel diaphragms Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.067 ac Peak Elev=314.08' Storage=176 cf 0.56 cfs0.56 cfs 0.00 cfs 0.56 cfs Pond GD579: Lots 3,4,5,7,9 gravel diaphragms Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration Broad-Crested Rectangular Weir NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 147HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Pond GD6: LOT 6 gravel diaphragm Inflow Area = 0.047 ac,100.00% Impervious, Inflow Depth = 7.44" for 100-Year event Inflow = 0.39 cfs @ 12.11 hrs, Volume= 0.029 af Outflow = 0.39 cfs @ 12.11 hrs, Volume= 0.028 af, Atten= 0%, Lag= 0.1 min Discarded = 0.00 cfs @ 12.11 hrs, Volume= 0.003 af Primary = 0.39 cfs @ 12.11 hrs, Volume= 0.024 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Peak Elev= 314.06' @ 12.11 hrs Surf.Area= 200 sf Storage= 85 cf Plug-Flow detention time= 76.8 min calculated for 0.028 af (96% of inflow) Center-of-Mass det. time= 51.7 min ( 792.4 - 740.8 ) Volume Invert Avail.Storage Storage Description #1 313.00' 96 cf Custom Stage Data (Conic) Listed below 240 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 313.00 200 0 0 200 314.20 200 240 240 260 Device Routing Invert Outlet Devices #1 Primary 314.00'10.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Discarded 313.00'0.250 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 12.11 hrs HW=314.06' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.39 cfs @ 12.11 hrs HW=314.06' TW=311.88' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 0.39 cfs @ 0.66 fps) NRCC 24-hr C 100-Year Rainfall=7.68"Burts Pit Proposed 12132019 REV 2020_0108 Printed 1/13/2020Prepared by Berkshire Design Group Page 148HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Pond GD6: LOT 6 gravel diaphragm Inflow Outflow Discarded Primary Hydrograph Time (hours) 3029282726252423222120191817161514131211109876543210Flow (cfs)0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.047 ac Peak Elev=314.06' Storage=85 cf 0.39 cfs0.39 cfs 0.00 cfs 0.39 cfs Pond GD6: LOT 6 gravel diaphragm Total Discarded Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)314 313 Exfiltration Broad-Crested Rectangular Weir