Drainage Report

Basin 5 witout exfiltration Proposed basin 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 13 Summary for Subcatchment 26S: pre-dev basin 5 Runoff = 3.33 cfs @ 12.20 hrs, Volume= 0.312 af, Depth= 0.97" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.03 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) CN Description 167,719 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" 1.4 174 0.1670 2.04 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 11.5 274 Total Subcatchment 26S: pre-dev basin 5 Hydrograph Runoff 3.33 cfs NOAA 24-hr D 3 2-Year Rainfall=3.44" Runoff Area=167,719 sf Runoff Volume=0.312 af Flow (cfs) 2 Runoff Depth=0.97"

af Flow (cfs) 2 Runoff Depth=0.97" Flow Length=274' Tc=11.5 min 1 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)