Drainage Report

Basin 2-1 Proposed Basin 2-1 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 21 Summary for Subcatchment 34S: Pre-dev basin 2 All Runoff = 32.35 cfs @ 12.45 hrs, Volume= 4.485 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 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 36 Runoff 34 32.35 cfs 32 NOAA 24-hr D 30 28 100-Year Rainfall=8.66" 26 Runoff Area=465,453 sf 24 22 Runoff Volume=4.485 af Flow (cfs) 20 18 Runoff Depth=5.04"

Runoff Volume=4.485 af Flow (cfs) 20 18 Runoff Depth=5.04" 16 Flow Length=1,360' 14 12 Tc=31.9 min 10 CN=70/0 8 6 4 2 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)