Drainage Report

Basin 3 without exfiltration proposed basin 3 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 24 Summary for Subcatchment 36S: Basin 3 undetained Runoff = 1.34 cfs @ 12.17 hrs, Volume= 0.122 af, Depth= 3.43" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 10-Year Rainfall=5.22" Area (sf) CN Description 11,836 74 >75% Grass cover, Good, HSG C 6,737 98 Paved roads w/curbs & sewers, HSG C 18,573 83 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.1000 0.20 Sheet Flow, Grass: Dense n= 0.240 P2= 3.44" 3.8 45 Total, Increased to minimum Tc = 10.0 min Subcatchment 36S: Basin 3 undetained Hydrograph Runoff 1.34 cfs NOAA 24-hr D 10-Year Rainfall=5.22" 1 Runoff Area=18,573 sf Runoff Volume=0.122 af Flow (cfs) Runoff Depth=3.43"

Runoff Volume=0.122 af Flow (cfs) Runoff Depth=3.43" Flow Length=45' Slope=0.1000 '/' Tc=10.0 min CN=74/98 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)