Drainage Report

Basin 2-1 Proposed Basin 2-1 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 9 Summary for Subcatchment 34S: Pre-dev basin 2 All Runoff = 5.69 cfs @ 12.49 hrs, Volume= 0.865 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 465,453 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 34S: Pre-dev basin 2 All Hydrograph Runoff 6 5.69 cfs NOAA 24-hr D 5 2-Year Rainfall=3.44" Runoff Area=465,453 sf 4 Runoff Volume=0.865 af Flow (cfs) Runoff Depth=0.97" 3 Flow Length=1,360'

Runoff Depth=0.97" 3 Flow Length=1,360' Tc=31.9 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)