251203_42 ERW_Stormwater Report

NOAA 24-hr D 10-Year Rainfall=6.37" 251202_42 ERW Waystone - Future Rainfall Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 12/3/2025 Page 34 Summary for Reach 10R: Inflow Area = 2.619 ac, 32.35% Impervious, Inflow Depth = 4.70" for 10-Year event Inflow = 11.81 cfs @ 12.10 hrs, Volume= 1.025 af Outflow = 11.81 cfs @ 12.10 hrs, Volume= 1.025 af, Atten= 0%, Lag= 0.0 min Routed to Pond BASIN : Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach 10R: Hydrograph 13 Inflow Outflow 11.81 cfs 11.81 cfs 12 Inflow Area=2.619 ac 11 10 9 Flow (cfs) 8 7 6 5 4 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)