251203_42 ERW_Stormwater Report

251202_42 ERW Waystone - Future Rainfall NOAA 24-hr D 25-Year Rainfall=6.44" Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: BASIN - FAILURE Time (hours) 0.00 2.50 5.00 7.50 10.00 12.50 15.00 17.50 20.00 22.50 25.00 27.50 30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00 52.50 55.00 57.50 60.00 62.50 65.00 67.50 70.00 Inflow (cfs) 0.00 0.05 0.08 0.16 0.45 2.82 0.52 0.32 0.24 0.20 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 Storage Elevation (acre-feet) (feet) 0.000 15.00 0.005 15.07 0.019 15.28 0.041 15.61 0.091 16.03 0.307 17.60 0.139 16.37 0.102 16.11 0.095 16.06 0.092 16.04 0.081 15.96 0.074 15.91 0.072 15.90 0.071 15.90 0.071 15.89 0.071 15.89 0.071 15.89 0.071 15.89 0.071 15.89 0.071 15.89 0.071 15.89 0.071 15.89 0.071 15.89 0.071 15.89 0.071 15.89 0.071 15.89 0.071 15.89 0.071 15.89 0.071 15.89 Primary (cfs) 0.00 0.00 0.00 0.00 0.20 4.76 0.93 0.38 0.26 0.22 0.07 0.01 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 12/3/2025 Page 22