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009_609286_75DrainageCalcs
Gutter Spread Analysis & Summary 803 Summer Street Boston, MA February 27, 2024 Prepared for: Massachusetts Department of Transportation, Highway Division 10 Park Plaza Boston, MA, 02116 Prepared by: 803 Summer Street Boston, MA 02127 (617) 896-4300 Gutter Spread Analysis & Summary i SUMMARY A gutter spread analysis was performed as part of the 75% stage design. The report found that zero proposed inlets have a gutter spread width that is above recommended values. The existing drainage design and layout was adjusted to be more efficient and new inlet locations were added to alleviate the amount of runoff received by critical structures. The changes to the proposed design were sufficient to reduce the gutter spread to within acceptable values. Gutter Spread Analysis & Summary 1 GUTTER SPREAD ANALYSIS & SUMMARY Design Gutter Spread (Allowable) Main Street is classified as an arterial roadway. The MassDOT Project Development and Design Guide (PDDG) states separate recommendations for collector and arterial roads. These recommendations are valid for roadways with shoulder widths greater than 6 feet. Neither route has a shoulder width greater than 6 feet within the project area. Therefore, the alternative recommended design spread width of 6 feet was used (PDDG 8.4.4.2). Closed System Layout The proposed drainage system was designed and laid out in AutoCAD: Civil 3D and analyzed using AutoCAD: Hydraflow Storm Sewers (or Storm Sewers), a drainage design and analysis extension for the program. The drainage design layout was exported to Storm Sewers. Storm Sewers was then updated to include applicable information about the proposed layout. This information included: grate dimensions, gutter (longitudinal) and cross slope, and bypass targets (receiving downstream inlet structures). Trench pan inlets were modeled in the program with a width of 1’ and length of 3’ to account for the design of the inlet. The program is designed to allow for a gutter cross slope that is steeper than the shoulder cross slope. This kind of combined shoulder and gutter cross section is often referred to as “composite”. The proposed design is not composite and utilizes a conventional gutter with a uniform cross slope. Therefore, the gutter width is synonymous with the shoulder width and gutter cross slope is equal to and shoulder cross slope. The gutter’s Manning roughness (n) was determined to be .0016. This value is consistent with PDDG Exhibit 8.22 for a rough asphalt surface. Design Storm Flow and Calculations The design storm used for the drainage design is a 25 year runoff frequency storm with a time of concentration (TC) of 6 minutes. These values are consistent with the recommended design parameters (PDDG 8.4.4.2). Using the online NOAA Atlas 14 application, the 25 year precipitation intensity was found to be (in inches) 0.687, 1.14, 1.58, and 2.01 for the 5, 15, 30, and 60 minute durations, respectively. The proposed drainage area for each inlet was calculated in AutoCAD and assigned in Storm Sewers. The weighted, Rational Method Runoff Coefficient (C) was found for each area. Pervious areas were classified as 0.15 and impervious areas were classified as 0.9. These values are consistent with PDDG Exhibit 8-9 for the recommended C values of average lawns/sandy soil slopping 2% to 7% and asphalt, respectively. Gutter Spread Analysis & Summary 2 AutoCAD: Hydraflow Storm Sewers, Gutter Spread Summary Report Attached is the Hydraflow Storm Sewers, Gutter Spread Summary Report. The report shows that no structure or section of roadway has a gutter spread width greater than 6 feet. There are 4 sections to the report, the Storm Sewer Inventory Report, Storm Sewer Summary Report, Inlet Report, and the Bypass Summary. Storm Sewers uses the column titled “Line No” instead of the structure numbers used throughout the design. The Inlet Report names the Line No and the related structure number. Storm Sewer Inventory Report The Storm Sewer Inventory Report summarizes inlet information. The calculated drainage area, runoff coefficient, and TC information is given under the “Flow Data” columns. The “Physical Data” information related to pipe slope and structure elevations is taken from the AutoCAD design. While they have a negligible effect on gutter spread, the pipe n value and junction loss calculations are also provided in the table. Storm Sewer Summary Report The Storm Sewer Summary Report summarizes pipe information. The flow rate through the pipe is calculated using the Rational Method and has been taken from a HydroCAD model, provided under the column “Flow Rate,” in cubic feet per second. The “Line ID” column provides the connected structure numbers of the pipe. While they have a negligible effect on gutter spread, other characteristics of the design such as minor losses are also provided in the table. Inlet Report The Inlet Report summarizes the gutter spread width and additional inlet information not described in previous sections. The flow rate into the inlet is given as Q. “Q Carry” is the carry overflow, or receiving runoff that bypassed upstream inlets. “Q Capt” is the captured flow, or the runoff entering the inlet. “Q Byp” is the bypassed flow, or runoff that bypasses the inlet and flows offsite or to a downstream inlet. Grate dimensions are shown for the applicable structure types, where length is the measure along the curb and width is the measure into the roadway. The gutter values of So, W, Sw, Sx, and n are shown under the “Gutter” header. These are the gutter longitudinal slope, gutter width (or shoulder width), gutter cross slope, shoulder cross slope (equal to gutter slope), and the gutter roughness. Gutter depth and spread are calculated and shown under the same column. Inlet depth and spread are calculated and shown under the “Inlet” header. Inlet spread is the width of the spread at the inlet and is generally less than the gutter spread. Bypass Summary The Bypass Summary summarizes the Line Nos and their bypass target. The bypass target is the receiving structure or area. Gutter Spread Analysis & Summary 3 Appendix AutoCAD: Hydraflow Storm Sewers, Gutter Spread Summary Report - Storm Sewer Inventory Report - Storm Sewer Summary Report - Inlet Report - Bypass Summary Pipe Sizing Calculations & Summary 803 Summer Street Boston, MA February 27, 2024 Prepared for: Massachusetts Department of Transportation, Highway Division 10 Park Plaza Boston, MA, 02116 Prepared by: 803 Summer Street Boston, MA 02127 (617) 896-4300 Pipe Sizing Calculations & Summary SUMMARY Pipe sizing calculations were performed as part of the 75% stage design. The rational method was used to calculate the flow rate for all catch basin to manhole connections. Mannings equation was used to determine if the pipes had been sufficiently sized based on the flow rate. The calculations show that all proposed pipes are sized to accommodate up to the 25-year storm. Pipe Sizing Calculations & Summary PIPE NETWORK: WEST & STATE STREET PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-06) Total Area, A (ac) =0.09 Design Flow Rate, Q (cfs) =0.45 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.08 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =2.92 cfs Area Grass (ac) =0.01 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =0.67%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.82 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.007 Flow Rate, Q (cfs) =0.45 S1/2 =0.08 Velocity, V (ft/s) = 3.72 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-07) Total Area, A (ac) =0.06 Design Flow Rate, Q (cfs) =0.33 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.06 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =5.82 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =2.65%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.027 Flow Rate, Q (cfs) =0.33 S1/2 =0.16 Velocity, V (ft/s) = 7.40 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-08) Total Area, A (ac) =0.06 Design Flow Rate, Q (cfs) =0.33 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.06 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =5.98 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =2.80%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.028 Flow Rate, Q (cfs) =0.33 S1/2 =0.17 Velocity, V (ft/s) = 7.61 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-1) Total Area, A (ac) =-Design Flow Rate, Q (cfs) =1.72 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =-Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =15.87 cfs Area Grass (ac) =-Pipe Size (in) =18 Area Woods (ac) = -Pipe Slope, S (%) =2.27%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.023 Flow Rate, Q (cfs) =1.72 S1/2 =0.15 Velocity, V (ft/s) = 8.98 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-2) Total Area, A (ac) =-Design Flow Rate, Q (cfs) =1.98 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =-Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =16.49 cfs Area Grass (ac) =-Pipe Size (in) =18 Area Woods (ac) = -Pipe Slope, S (%) =2.45%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.025 Flow Rate, Q (cfs) =1.98 S1/2 =0.16 Velocity, V (ft/s) = 9.33 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-3) Total Area, A (ac) =-Design Flow Rate, Q (cfs) =5.29 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =-Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =9.24 cfs Area Grass (ac) =-Pipe Size (in) =18 Area Woods (ac) = -Pipe Slope, S (%) =0.77%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.008 Flow Rate, Q (cfs) =5.29 S1/2 =0.09 Velocity, V (ft/s) = 5.23 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-4) Total Area, A (ac) =-Design Flow Rate, Q (cfs) =5.29 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =-Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =9.12 cfs Area Grass (ac) =-Pipe Size (in) =18 Area Woods (ac) = -Pipe Slope, S (%) =0.75%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.008 Flow Rate, Q (cfs) =5.29 S1/2 =0.09 Velocity, V (ft/s) = 5.16 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-5) Total Area, A (ac) =0.04 Design Flow Rate, Q (cfs) =0.20 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.04 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =5.01 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =1.97%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.020 Flow Rate, Q (cfs) =0.20 S1/2 =0.14 Velocity, V (ft/s) = 6.38 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-8) Total Area, A (ac) =0.05 Design Flow Rate, Q (cfs) =0.23 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.04 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =3.43 cfs Area Grass (ac) =0.01 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =0.92%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.79 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.009 Flow Rate, Q (cfs) =0.23 S1/2 =0.10 Velocity, V (ft/s) = 4.36 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-9) Total Area, A (ac) =0.05 Design Flow Rate, Q (cfs) =0.25 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.04 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =3.27 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =0.84%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.84 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.008 Flow Rate, Q (cfs) =0.25 S1/2 =0.09 Velocity, V (ft/s) = 4.17 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-11) Total Area, A (ac) =0.38 Design Flow Rate, Q (cfs) =1.97 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.35 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =3.90 cfs Area Grass (ac) =0.04 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =1.19%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.84 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.012 Flow Rate, Q (cfs) =1.97 S1/2 =0.11 Velocity, V (ft/s) = 4.96 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-86) Total Area, A (ac) =0.12 Design Flow Rate, Q (cfs) =0.64 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.12 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =7.80 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =4.77%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.048 Flow Rate, Q (cfs) =0.64 S1/2 =0.22 Velocity, V (ft/s) = 9.93 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-129) Total Area, A (ac) =0.01 Design Flow Rate, Q (cfs) =0.03 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.01 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =7.48 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =4.39%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.044 Flow Rate, Q (cfs) =0.03 S1/2 =0.21 Velocity, V (ft/s) = 9.53 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-137) Total Area, A (ac) =0.01 Design Flow Rate, Q (cfs) =5.29 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.01 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =8.09 cfs Area Grass (ac) =0.00 Pipe Size (in) =18 Area Woods (ac) = 0.00 Pipe Slope, S (%) =0.59%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.006 Flow Rate, Q (cfs) =5.29 S1/2 =0.08 Velocity, V (ft/s) = 4.58 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-138) Total Area, A (ac) =0.12 Design Flow Rate, Q (cfs) =0.66 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.12 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =3.99 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =1.25%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.89 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.013 Flow Rate, Q (cfs) =0.66 S1/2 =0.11 Velocity, V (ft/s) = 5.09 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-171) Total Area, A (ac) =0.03 Design Flow Rate, Q (cfs) =0.18 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.03 Pipe Material (HDPE, RCP, PVC) =DI (1.49/n )AR2/3S1/2 =3.71 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =0.92%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.012 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.009 Flow Rate, Q (cfs) =0.18 S1/2 =0.10 Velocity, V (ft/s) = 4.73 Pipe Sizing Calculations & Summary PIPE NETWORK: OLD SOUTH STREET PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-14) Total Area, A (ac) =Design Flow Rate, Q (cfs) =5.06 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =10.21 cfs Area Grass (ac) = Pipe Size (in) =18 Area Woods (ac) =Pipe Slope, S (%) =0.94%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.009 Flow Rate, Q (cfs) =5.06 S1/2 =0.10 Velocity, V (ft/s) = 5.78 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-15) Total Area, A (ac) =Design Flow Rate, Q (cfs) =6.24 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =7.45 cfs Area Grass (ac) = Pipe Size (in) =18 Area Woods (ac) =Pipe Slope, S (%) =0.50%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.005 Flow Rate, Q (cfs) =6.24 S1/2 =0.07 Velocity, V (ft/s) = 4.21 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-16) Total Area, A (ac) =Design Flow Rate, Q (cfs) =7.01 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =7.88 cfs Area Grass (ac) = Pipe Size (in) =18 Area Woods (ac) =Pipe Slope, S (%) =0.56%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.006 Flow Rate, Q (cfs) =7.01 S1/2 =0.07 Velocity, V (ft/s) = 4.46 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-16 (2)) Total Area, A (ac) =Design Flow Rate, Q (cfs) =7.04 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =7.52 cfs Area Grass (ac) = Pipe Size (in) =18 Area Woods (ac) =Pipe Slope, S (%) =0.51%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.005 Flow Rate, Q (cfs) =7.04 S1/2 =0.07 Velocity, V (ft/s) = 4.26 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-17A) Total Area, A (ac) =Design Flow Rate, Q (cfs) =8.40 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =9.18 cfs Area Grass (ac) = Pipe Size (in) =18 Area Woods (ac) =Pipe Slope, S (%) =0.76%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.008 Flow Rate, Q (cfs) =8.40 S1/2 =0.09 Velocity, V (ft/s) = 5.20 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-17B) Total Area, A (ac) =Design Flow Rate, Q (cfs) =9.12 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =11.15 cfs Area Grass (ac) = Pipe Size (in) =18 Area Woods (ac) =Pipe Slope, S (%) =1.12%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.011 Flow Rate, Q (cfs) =9.12 S1/2 =0.11 Velocity, V (ft/s) = 6.31 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-18) Total Area, A (ac) =Design Flow Rate, Q (cfs) =10.41 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =17.66 cfs Area Grass (ac) = Pipe Size (in) =18 Area Woods (ac) =Pipe Slope, S (%) =2.81%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.028 Flow Rate, Q (cfs) =10.41 S1/2 =0.17 Velocity, V (ft/s) = 9.99 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-20) Total Area, A (ac) =0.21 Design Flow Rate, Q (cfs) =1.09 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.19 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =4.95 cfs Area Grass (ac) =0.02 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =1.92%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.85 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.019 Flow Rate, Q (cfs) =1.09 S1/2 =0.14 Velocity, V (ft/s) = 6.30 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-25) Total Area, A (ac) =0.24 Design Flow Rate, Q (cfs) =1.28 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.23 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =3.31 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =0.86%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.89 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.009 Flow Rate, Q (cfs) =1.28 S1/2 =0.09 Velocity, V (ft/s) = 4.22 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-26) Total Area, A (ac) =0.11 Design Flow Rate, Q (cfs) =0.57 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.10 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =2.58 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =0.52%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.88 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.005 Flow Rate, Q (cfs) =0.57 S1/2 =0.07 Velocity, V (ft/s) = 3.28 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-28) Total Area, A (ac) =0.09 Design Flow Rate, Q (cfs) =0.48 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.09 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =6.90 cfs Area Grass (ac) =0.01 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =3.73%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.86 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.037 Flow Rate, Q (cfs) =0.48 S1/2 =0.19 Velocity, V (ft/s) = 8.78 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-29) Total Area, A (ac) =0.04 Design Flow Rate, Q (cfs) =0.21 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.04 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =7.27 cfs Area Grass (ac) =0.01 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =4.14%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.82 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.041 Flow Rate, Q (cfs) =0.21 S1/2 =0.20 Velocity, V (ft/s) = 9.25 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-31) Total Area, A (ac) =0.12 Design Flow Rate, Q (cfs) =0.70 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.12 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =6.91 cfs Area Grass (ac) =0.04 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =3.74%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.94 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Areas Do Not Add Up Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.037 Flow Rate, Q (cfs) =0.70 S1/2 =0.19 Velocity, V (ft/s) = 8.80 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-33) Total Area, A (ac) =0.15 Design Flow Rate, Q (cfs) =0.78 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.14 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =5.11 cfs Area Grass (ac) =0.01 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =2.05%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.84 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.021 Flow Rate, Q (cfs) =0.78 S1/2 =0.14 Velocity, V (ft/s) = 6.51 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-107) Total Area, A (ac) =Design Flow Rate, Q (cfs) =0.91 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =DI (1.49/n )AR2/3S1/2 =4.02 cfs Area Grass (ac) = Pipe Size (in) =12 Area Woods (ac) =Pipe Slope, S (%) =1.08%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.012 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.011 Flow Rate, Q (cfs) =0.91 S1/2 =0.10 Velocity, V (ft/s) = 5.12 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-113) Total Area, A (ac) =0.35 Design Flow Rate, Q (cfs) =1.87 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.34 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =3.64 cfs Area Grass (ac) =0.01 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =1.04%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.89 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.010 Flow Rate, Q (cfs) =1.87 S1/2 =0.10 Velocity, V (ft/s) = 4.64 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-118) Total Area, A (ac) =0.00 Design Flow Rate, Q (cfs) =0.02 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.00 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =5.08 cfs Area Grass (ac) = Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =2.02%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.020 Flow Rate, Q (cfs) =0.02 S1/2 =0.14 Velocity, V (ft/s) = 6.46 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-122) Total Area, A (ac) =0.10 Design Flow Rate, Q (cfs) =0.57 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.10 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =4.48 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =1.57%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.016 Flow Rate, Q (cfs) =0.57 S1/2 =0.13 Velocity, V (ft/s) = 5.70 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-172) Total Area, A (ac) =0.15 Design Flow Rate, Q (cfs) =0.82 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.15 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =12.68 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =12.59%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.126 Flow Rate, Q (cfs) =0.82 S1/2 =0.35 Velocity, V (ft/s) = 16.14 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-174) Total Area, A (ac) =Design Flow Rate, Q (cfs) =10.41 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =21.01 cfs Area Grass (ac) = Pipe Size (in) =18 Area Woods (ac) =Pipe Slope, S (%) =3.98%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.040 Flow Rate, Q (cfs) =10.41 S1/2 =0.20 Velocity, V (ft/s) = 11.89 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-175) Total Area, A (ac) =0.07 Design Flow Rate, Q (cfs) =0.33 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.06 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =7.11 cfs Area Grass (ac) =0.01 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =3.96%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.82 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.040 Flow Rate, Q (cfs) =0.33 S1/2 =0.20 Velocity, V (ft/s) = 9.05 Pipe Sizing Calculations & Summary PIPE NETWORK: PLEASANT STREET PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-34) Total Area, A (ac) =Design Flow Rate, Q (cfs) =4.53 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =5.21 cfs Area Grass (ac) = Pipe Size (in) =12 Area Woods (ac) =Pipe Slope, S (%) =2.13%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.021 Flow Rate, Q (cfs) =4.53 S1/2 =0.15 Velocity, V (ft/s) = 6.64 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-35) Total Area, A (ac) =Design Flow Rate, Q (cfs) =8.41 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =DI (1.49/n )AR2/3S1/2 =19.86 cfs Area Grass (ac) = Pipe Size (in) =18 Area Woods (ac) =Pipe Slope, S (%) =3.03%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.012 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.030 Flow Rate, Q (cfs) =8.41 S1/2 =0.17 Velocity, V (ft/s) = 11.24 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-40) Total Area, A (ac) =0.38 Design Flow Rate, Q (cfs) =1.95 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.34 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =5.03 cfs Area Grass (ac) =0.04 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =1.98%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.83 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.020 Flow Rate, Q (cfs) =1.95 S1/2 =0.14 Velocity, V (ft/s) = 6.40 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-42) Total Area, A (ac) =0.39 Design Flow Rate, Q (cfs) =2.02 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.36 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =3.95 cfs Area Grass (ac) =0.03 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =1.22%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.85 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.012 Flow Rate, Q (cfs) =2.02 S1/2 =0.11 Velocity, V (ft/s) = 5.02 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-43) Total Area, A (ac) =0.28 Design Flow Rate, Q (cfs) =1.38 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.24 Pipe Material (HDPE, RCP, PVC) =DI (1.49/n )AR2/3S1/2 =4.76 cfs Area Grass (ac) =0.04 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =1.51%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.012 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.82 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.015 Flow Rate, Q (cfs) =1.38 S1/2 =0.12 Velocity, V (ft/s) = 6.06 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-117) Total Area, A (ac) =0.25 Design Flow Rate, Q (cfs) =1.29 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.23 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =7.82 cfs Area Grass (ac) =0.02 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =4.79%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.84 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.048 Flow Rate, Q (cfs) =1.29 S1/2 =0.22 Velocity, V (ft/s) = 9.95 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-119) Total Area, A (ac) =0.13 Design Flow Rate, Q (cfs) =0.67 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.12 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =3.52 cfs Area Grass (ac) =0.01 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =0.97%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.87 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.010 Flow Rate, Q (cfs) =0.67 S1/2 =0.10 Velocity, V (ft/s) = 4.48 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-124) Total Area, A (ac) =0.11 Design Flow Rate, Q (cfs) =0.61 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.11 Pipe Material (HDPE, RCP, PVC) =DI (1.49/n )AR2/3S1/2 =8.68 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =5.03%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.012 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.89 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.050 Flow Rate, Q (cfs) =0.61 S1/2 =0.22 Velocity, V (ft/s) = 11.05 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-125) Total Area, A (ac) =Design Flow Rate, Q (cfs) =9.10 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =11.10 cfs Area Grass (ac) = Pipe Size (in) =18 Area Woods (ac) =Pipe Slope, S (%) =1.11%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.77 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 4.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.38 R2/3 =0.520 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.011 Flow Rate, Q (cfs) =9.10 S1/2 =0.11 Velocity, V (ft/s) = 6.28 Pipe Sizing Calculations & Summary PIPE NETWORK: KING STREET PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-77) Total Area, A (ac) =0.01 Design Flow Rate, Q (cfs) =0.07 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.01 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =6.13 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =2.94%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.81 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.029 Flow Rate, Q (cfs) =0.07 S1/2 =0.17 Velocity, V (ft/s) = 7.80 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-78) Total Area, A (ac) =0.16 Design Flow Rate, Q (cfs) =0.86 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.16 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =7.60 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =4.53%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.045 Flow Rate, Q (cfs) =0.86 S1/2 =0.21 Velocity, V (ft/s) = 9.68 Pipe Sizing Calculations & Summary PIPE NETWORK: BRIDGE STREET PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-45) Total Area, A (ac) =Design Flow Rate, Q (cfs) =3.22 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =4.90 cfs Area Grass (ac) = Pipe Size (in) =12 Area Woods (ac) =Pipe Slope, S (%) =1.88%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.019 Flow Rate, Q (cfs) =3.22 S1/2 =0.14 Velocity, V (ft/s) = 6.24 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-46) Total Area, A (ac) =Design Flow Rate, Q (cfs) =4.08 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =6.64 cfs Area Grass (ac) = Pipe Size (in) =12 Area Woods (ac) =Pipe Slope, S (%) =3.45%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.035 Flow Rate, Q (cfs) =4.08 S1/2 =0.19 Velocity, V (ft/s) = 8.45 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-47) Total Area, A (ac) =Design Flow Rate, Q (cfs) =1.73 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =50.05 cfs Area Grass (ac) = Pipe Size (in) =36 Area Woods (ac) =Pipe Slope, S (%) =0.56%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =7.07 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 9.42 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.75 R2/3 =0.825 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.006 Flow Rate, Q (cfs) =1.73 S1/2 =0.07 Velocity, V (ft/s) = 7.08 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-52) Total Area, A (ac) =0.15 Design Flow Rate, Q (cfs) =0.88 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.14 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =7.86 cfs Area Grass (ac) =0.01 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =4.84%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.86 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.048 Flow Rate, Q (cfs) =0.88 S1/2 =0.22 Velocity, V (ft/s) = 10.01 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-53) Total Area, A (ac) =0.06 Design Flow Rate, Q (cfs) =0.45 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.06 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =7.22 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =4.09%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.86 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =8.59 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.041 Flow Rate, Q (cfs) =0.45 S1/2 =0.20 Velocity, V (ft/s) = 9.20 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-63) Total Area, A (ac) =0.07 Design Flow Rate, Q (cfs) =0.39 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.07 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =81.91 cfs Area Grass (ac) =0.00 Pipe Size (in) =36 Area Woods (ac) = 0.00 Pipe Slope, S (%) =1.50%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =7.07 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 9.42 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.75 R2/3 =0.825 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.015 Flow Rate, Q (cfs) =0.39 S1/2 =0.12 Velocity, V (ft/s) = 11.59 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-67) Total Area, A (ac) =Design Flow Rate, Q (cfs) =1.29 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =2.79 cfs Area Grass (ac) = Pipe Size (in) =12 Area Woods (ac) =Pipe Slope, S (%) =0.61%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.006 Flow Rate, Q (cfs) =1.29 S1/2 =0.08 Velocity, V (ft/s) = 3.55 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-68) Total Area, A (ac) =Design Flow Rate, Q (cfs) =2.81 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =7.78 cfs Area Grass (ac) = Pipe Size (in) =12 Area Woods (ac) =Pipe Slope, S (%) =4.74%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.047 Flow Rate, Q (cfs) =2.81 S1/2 =0.22 Velocity, V (ft/s) = 9.90 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-75) Total Area, A (ac) =Design Flow Rate, Q (cfs) =5.00 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =191.90 cfs Area Grass (ac) = Pipe Size (in) =60 Area Woods (ac) =Pipe Slope, S (%) =0.54%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =19.63 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 15.71 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 1.25 R2/3 =1.160 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.005 Flow Rate, Q (cfs) =5.00 S1/2 =0.07 Velocity, V (ft/s) = 9.77 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-80) Total Area, A (ac) =0.02 Design Flow Rate, Q (cfs) =0.13 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.02 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =3.31 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =0.86%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.009 Flow Rate, Q (cfs) =0.13 S1/2 =0.09 Velocity, V (ft/s) = 4.22 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-82) Total Area, A (ac) =0.03 Design Flow Rate, Q (cfs) =0.19 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.03 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =3.96 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =1.23%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.012 Flow Rate, Q (cfs) =0.19 S1/2 =0.11 Velocity, V (ft/s) = 5.04 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-100) Total Area, A (ac) =0.11 Design Flow Rate, Q (cfs) =0.62 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.11 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =5.82 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =2.65%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.027 Flow Rate, Q (cfs) =0.62 S1/2 =0.16 Velocity, V (ft/s) = 7.40 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-102) Total Area, A (ac) =0.16 Design Flow Rate, Q (cfs) =0.89 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.16 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =5.15 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =2.08%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.021 Flow Rate, Q (cfs) =0.89 S1/2 =0.14 Velocity, V (ft/s) = 6.56 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-104) Total Area, A (ac) =0.09 Design Flow Rate, Q (cfs) =0.51 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.09 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =18.07 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =25.59%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.256 Flow Rate, Q (cfs) =0.51 S1/2 =0.51 Velocity, V (ft/s) = 23.01 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-112) Total Area, A (ac) =0.01 Design Flow Rate, Q (cfs) =0.05 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.01 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =36.01 cfs Area Grass (ac) =0.00 Pipe Size (in) =36 Area Woods (ac) = 0.00 Pipe Slope, S (%) =0.29%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =7.07 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 9.42 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.75 R2/3 =0.825 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.003 Flow Rate, Q (cfs) =0.05 S1/2 =0.05 Velocity, V (ft/s) = 5.10 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-120) Total Area, A (ac) =0.14 Design Flow Rate, Q (cfs) =0.76 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.14 Pipe Material (HDPE, RCP, PVC) =DI (1.49/n )AR2/3S1/2 =7.40 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =3.66%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.012 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.88 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.037 Flow Rate, Q (cfs) =0.76 S1/2 =0.19 Velocity, V (ft/s) = 9.43 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-121) Total Area, A (ac) =0.04 Design Flow Rate, Q (cfs) =0.22 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.04 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =4.23 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =1.40%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.014 Flow Rate, Q (cfs) =0.22 S1/2 =0.12 Velocity, V (ft/s) = 5.38 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-126) Total Area, A (ac) =0.05 Design Flow Rate, Q (cfs) =0.28 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.05 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =2.90 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =0.66%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.007 Flow Rate, Q (cfs) =0.28 S1/2 =0.08 Velocity, V (ft/s) = 3.70 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-127) Total Area, A (ac) =0.34 Design Flow Rate, Q (cfs) =1.80 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.32 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =6.02 cfs Area Grass (ac) =0.01 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =2.84%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.88 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.028 Flow Rate, Q (cfs) =1.80 S1/2 =0.17 Velocity, V (ft/s) = 7.67 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-141) Total Area, A (ac) =0.18 Design Flow Rate, Q (cfs) =0.97 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.18 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =2.53 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =0.50%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.89 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.005 Flow Rate, Q (cfs) =0.97 S1/2 =0.07 Velocity, V (ft/s) = 3.22 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-176) Total Area, A (ac) =0.12 Design Flow Rate, Q (cfs) =0.63 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =0.12 Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =4.21 cfs Area Grass (ac) =0.00 Pipe Size (in) =12 Area Woods (ac) = 0.00 Pipe Slope, S (%) =1.39%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.90 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.014 Flow Rate, Q (cfs) =0.63 S1/2 =0.12 Velocity, V (ft/s) = 5.36 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-178) Total Area, A (ac) =Design Flow Rate, Q (cfs) =3.22 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =3.66 cfs Area Grass (ac) = Pipe Size (in) =12 Area Woods (ac) =Pipe Slope, S (%) =1.05%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.011 Flow Rate, Q (cfs) =3.22 S1/2 =0.10 Velocity, V (ft/s) = 4.66 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-179) Total Area, A (ac) =Design Flow Rate, Q (cfs) =5.00 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =12.37 cfs Area Grass (ac) = Pipe Size (in) =15 Area Woods (ac) =Pipe Slope, S (%) =3.65%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =1.23 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 3.93 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.31 R2/3 =0.461 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.037 Flow Rate, Q (cfs) =5.00 S1/2 =0.19 Velocity, V (ft/s) = 10.08 PROJECT NAME:Northampton, MA DATE:2/21/2024 CALCS BY:MM CHECKED BY: Rational Method Flow Rate Pipe Capacity Analysis (Pipe-185) Total Area, A (ac) =Design Flow Rate, Q (cfs) =5.00 Manning's Equation Q = VA = (1.49/n )AR2/3S1/2 [cfs] Area Impervious (ac) =Pipe Material (HDPE, RCP, PVC) =RCP (1.49/n )AR2/3S1/2 =5.60 cfs Area Grass (ac) = Pipe Size (in) =12 Area Woods (ac) =Pipe Slope, S (%) =2.46%Pipe Sufficiently Sized:Yes Time of Concentration, Tc (min) =6.0 Manning's Roughness Coefficient, n =0.013 Return Frequency Period (years) =25 Wetted Area, A (sf) =0.79 Cover Characteristics, C =0.00 Wetted Perimeter, P (ft) = 3.14 Rainfall Intensity, i (in/hr) =6.09 Hydraulic Radius, R [A/P] (ft) = 0.25 R2/3 =0.397 Q = CiA [cfs] Pipe Slope, S (ft/ft) = 0.025 Flow Rate, Q (cfs) =5.00 S1/2 =0.16 Velocity, V (ft/s) = 7.13