Drainage Report

Basin 2-4 without exfiltration Proposed Basin 2-4 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 23 Summary for Subcatchment 45S: Basin 2-4 pe-development Runoff = 3.80 cfs @ 12.27 hrs, Volume= 0.404 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 96,036 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" 3.6 290 0.0720 1.34 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 18.0 390 Total Subcatchment 45S: Basin 2-4 pe-development Hydrograph Runoff 4 3.80 cfs NOAA 24-hr D 10-Year Rainfall=5.22" 3 Runoff Area=96,036 sf Runoff Volume=0.404 af Flow (cfs) Runoff Depth=2.20" 2

fs) Runoff Depth=2.20" 2 Flow Length=390' Tc=18.0 min CN=70/0 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)