251203_42 ERW_Stormwater Report

250903_42 ERW Waystone - Future Rainfall NOAA 24-hr D 100-Year Rainfall=11.52" Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment EDA-1 (IMPERV): Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.13 0.03 2.00 0.28 0.13 3.00 0.43 0.26 4.00 0.60 0.41 5.00 0.79 0.59 6.00 0.98 0.77 7.00 1.21 1.00 8.00 1.49 1.28 9.00 1.83 1.60 10.00 2.28 2.06 11.00 2.99 2.76 12.00 5.52 5.28 13.00 8.53 8.29 14.00 9.24 9.00 15.00 9.69 9.45 16.00 10.03 9.78 17.00 10.31 10.07 18.00 10.54 10.30 19.00 10.73 10.49 20.00 10.92 10.67 21.00 11.09 10.84 22.00 11.24 11.00 23.00 11.39 11.15 24.00 11.52 11.28 25.00 11.52 11.28 26.00 11.52 11.28 27.00 11.52 11.28 28.00 11.52 11.28 29.00 11.52 11.28 30.00 11.52 11.28 31.00 11.52 11.28 32.00 11.52 11.28 33.00 11.52 11.28 34.00 11.52 11.28 35.00 11.52 11.28 36.00 11.52 11.28 37.00 11.52 11.28 38.00 11.52 11.28 39.00 11.52 11.28 40.00 11.52 11.28 41.00 11.52 11.28 42.00 11.52 11.28 43.00 11.52 11.28 44.00 11.52 11.28 45.00 11.52 11.28 46.00 11.52 11.28 47.00 11.52 11.28 48.00 11.52 11.28 49.00 11.52 11.28 50.00 11.52 11.28 51.00 11.52 11.28 Runoff (cfs) 0.00 0.02 0.04 0.05 0.05 0.06 0.06 0.08 0.10 0.11 0.17 0.31 2.32 0.35 0.18 0.12 0.10 0.08 0.07 0.06 0.06 0.05 0.05 0.04 0.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 52.00 11.52 11.28 53.00 11.52 11.28 54.00 11.52 11.28 55.00 11.52 11.28 56.00 11.52 11.28 57.00 11.52 11.28 58.00 11.52 11.28 59.00 11.52 11.28 60.00 11.52 11.28 61.00 11.52 11.28 62.00 11.52 11.28 63.00 11.52 11.28 64.00 11.52 11.28 65.00 11.52 11.28 66.00 11.52 11.28 67.00 11.52 11.28 68.00 11.52 11.28 69.00 11.52 11.28 70.00 11.52 11.28 71.00 11.52 11.28 72.00 11.52 11.28 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Printed 11/25/2025 Page 28