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Stormwater Report_Peak Rates_rev 01-2012
Tighe&Bond Kollmorgen Stormwater Report Peak Rate Attenuation TABLE 2 Peak Discharge Rates for DP-4 (Basin 6) Return Freq. BTI’s Existing Peak Discharge (cfs) Adjusted Existing Peak Discharge (cfs) BTI’s Proposed Post- development Peak Discharge (cfs) Proposed Post- development Peak Discharge With Infiltration (cfs) Actual Post-development Peak Discharge With Infiltration (cfs) 1-year 3.5 3.5 3.0 2.2 2.2 2-year 7.5 5.9 5.15 3.0 3.6 10-year 18.9 17.0 18.0 12.9 14.1 25-year 24.4 23.5 22.3 19.0 20.3 100-year 37.0 34.9 36.8 30.5 31.6 TABLE 3 Peak Discharge Rates for DP-5 (Basin 5) Return Freq. BTI’s Existing Peak Discharge (cfs) Adjusted Existing Peak Discharge (cfs) BTI’s Proposed Post- development Peak Discharge (cfs) Proposed Post- development Peak Discharge (cfs) Actual Post- development Peak Discharge (cfs) 1-year 8.74 9.1 2.3 2.9 2.9 2-year 14.6 12.6 4.0 4.1 4.4 10-year 29.5 27.2 8.4 11.2 11.5 25-year 36.4 35.0 10.5 14.9 15.1 100-year 51.4 48.5 17.3 23.6 23.7