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 9 Summary for Subcatchment 38S: Basin 2-5 [47] Hint: Peak is 388% of capacity of segment #2 Runoff = 4.60 cfs @ 12.17 hrs, Volume= 0.441 af, Depth= 3.21" Routed to Pond 39P : pond 2-5 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 60,317 98 Roofs, HSG C 11,558 98 Water Surface, 0% imp, HSG C 71,875 98 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.5 100 0.0100 1.08 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.44" 3.0 920 0.0410 5.17 1.18 Pipe Channel, 12.0" Round w/ 8.0" inside fill Area= 0.2 sf Perim= 2.2' r= 0.11' n= 0.013 4.5 1,020 Total, Increased to minimum Tc = 10.0 min Subcatchment 38S: Basin 2-5 Hydrograph 5 Runoff 4.60 cfs NOAA 24-hr D 4 2-Year Rainfall=3.44"

NOAA 24-hr D 4 2-Year Rainfall=3.44" Runoff Area=71,875 sf 3 Runoff Volume=0.441 af Flow (cfs) Runoff Depth=3.21" Flow Length=1,020' 2 Tc=10.0 min CN=98/98 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)