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 Printed 11/25/2025 Page 33 Summary for Reach DP1-EX: Inflow Area = Inflow = Outflow = 2.669 ac, 11.97% Impervious, Inflow Depth = 8.54" for 100-Year event 18.32 cfs @ 12.20 hrs, Volume= 1.899 af 18.32 cfs @ 12.20 hrs, Volume= 1.899 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach DP1-EX: Flow (cfs) Hydrograph 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Outflow 18.32 cfs 18.32 cfs 0 2 4 Inflow Area=2.669 ac 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)