Drainage Report

Basin 2-5 without exfiltration Proposed Basin 2-5 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 11 Summary for Subcatchment 42S: Basin 2-5 predevelopment Runoff = 1.34 cfs @ 12.22 hrs, Volume= 0.134 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 71,875 70 Woods, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.9 100 0.0800 0.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.44" 1.3 120 0.1000 1.58 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 13.2 220 Total Subcatchment 42S: Basin 2-5 predevelopment Hydrograph Runoff 1.34 cfs NOAA 24-hr D 2-Year Rainfall=3.44" 1 Runoff Area=71,875 sf Runoff Volume=0.134 af Flow (cfs) Runoff Depth=0.97"

0.134 af Flow (cfs) Runoff Depth=0.97" Flow Length=220' Tc=13.2 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)