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 13 Summary for Reach DP2-EX: Inflow Area = Inflow = Outflow = 0.423 ac, 0.00% Impervious, Inflow Depth = 1.66" for 2-Year event 0.77 cfs @ 12.15 hrs, Volume= 0.059 af 0.77 cfs @ 12.15 hrs, Volume= 0.059 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 DP2-EX: Hydrograph 0.85 0.8 0.75 Inflow Outflow 0.77 cfs 0.77 cfs Inflow Area=0.423 ac 0.7 0.65 0.6 Flow (cfs) 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 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)