Drainage Report

Basin 2-3 without exfiltration Proposed Basin 2-3 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 12 Summary for Subcatchment 45S: basin 2-3 pre-development Runoff = 1.92 cfs @ 12.21 hrs, Volume= 0.185 af, Depth= 0.97" 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 2-Year Rainfall=3.44" Area (sf) CN Description 99,393 70 Woods, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.1 100 0.1200 0.16 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.44" 2.1 180 0.0830 1.44 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 12.2 280 Total Subcatchment 45S: basin 2-3 pre-development Hydrograph Runoff 2 1.92 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=99,393 sf Runoff Volume=0.185 af Flow (cfs) Runoff Depth=0.97" 1

(cfs) Runoff Depth=0.97" 1 Flow Length=280' Tc=12.2 min CN=70/0 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)