Drainage Report

Basdin 2-2 without Exfiltration Proposed Basin 2-2 R5 NOAA 24-hr D 100-Year Rainfall=8.66" 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 2-2 pre-development Runoff = 6.47 cfs @ 12.21 hrs, Volume= 0.600 af, Depth= 5.04" 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 100-Year Rainfall=8.66" Area (sf) CN Description 62,290 70 Woods, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.5 100 0.0700 0.13 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.44" 0.7 30 0.0200 0.71 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 13.3 130 Total Subcatchment 45S: Basin 2-2 pre-development Hydrograph 7 Runoff 6.47 cfs NOAA 24-hr D 6 100-Year Rainfall=8.66" 5 Runoff Area=62,290 sf Runoff Volume=0.600 af Flow (cfs) 4 Runoff Depth=5.04" 3

ume=0.600 af Flow (cfs) 4 Runoff Depth=5.04" 3 Flow Length=130' Tc=13.3 min 2 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)