Drainage Report

Basin 1 without exfiltration Proposed basin 1 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 27 Summary for Subcatchment 36S: Basin 1 Predevelopment Runoff = 11.02 cfs @ 12.46 hrs, Volume= 1.553 af, Depth= 2.20" 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 368,926 70 Woods, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.4 100 0.0500 0.12 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.44" 17.6 1,260 0.0570 1.19 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 31.9 1,360 Total Subcatchment 36S: Basin 1 Predevelopment Hydrograph 12 Runoff 11.02 cfs 11 NOAA 24-hr D 10 10-Year Rainfall=5.22" 9 Runoff Area=368,926 sf 8 Runoff Volume=1.553 af 7 Flow (cfs) Runoff

Runoff Volume=1.553 af 7 Flow (cfs) Runoff Depth=2.20" 6 Flow Length=1,360' 5 4 Tc=31.9 min 3 CN=70/0 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)