250701_42 ERW_Stormwater Report

NOAA 24-hr D 2-Year Rainfall=3.44" 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 7 Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment PR 1A-P: Runoff Area=13,167 sf 0.00% Impervious Runoff Depth=1.45" Flow Length=203' Tc=5.9 min CN=78 Runoff=0.50 cfs 0.037 af Subcatchment PR 1B-I: Runoff Area=36,906 sf 100.00% Impervious Runoff Depth=3.21" Flow Length=136' Tc=1.5 min CN=98 Runoff=3.04 cfs 0.226 af Subcatchment PR 1B-P: Runoff Area=77,195 sf 0.00% Impervious Runoff Depth=1.52" Flow Length=180' Tc=7.5 min CN=79 Runoff=2.95 cfs 0.224 af Reach 10R: Inflow=5.32 cfs 0.451 af Outflow=5.32 cfs 0.451 af Reach DP1-PR: Inflow=1.22 cfs 0.132 af Outflow=1.22 cfs 0.132 af Pond BASIN: Peak Elev=16.66' Storage=0.115 af Inflow=5.32 cfs 0.451 af Discarded=0.60 cfs 0.355 af Primary=1.05 cfs 0.096 af Outflow=1.65 cfs 0.451 af Total Runoff Area = 2.922 ac Runoff Volume = 0.487 af Average Runoff Depth = 2.00" 71.00% Pervious = 2.074 ac 29.00% Impervious = 0.847 ac