251203_42 ERW_Stormwater Report

NOAA 24-hr D 2-Year Rainfall=4.09" 250903_42 ERW Waystone - Future Rainfall Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 11/25/2025 Page 11 Summary for Reach DP1-EX: Inflow Area = Inflow = Outflow = 2.669 ac, 11.97% Impervious, Inflow Depth = 1.93" for 2-Year event 3.95 cfs @ 12.20 hrs, Volume= 0.428 af 3.95 cfs @ 12.20 hrs, Volume= 0.428 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: Hydrograph Inflow Outflow 3.95 cfs 4 3.95 cfs Inflow Area=2.669 ac Flow (cfs) 3 2 1 0 0 2 4 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)