Drainage Report

Basin 2-6 without exfiltration Proposed basin 2-6 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 29 Summary for Subcatchment 36S: Basin 2-6 [47] Hint: Peak is 747% of capacity of segment #3 Runoff = 13.04 cfs @ 12.17 hrs, Volume= 1.292 af, Depth= 8.42" Routed to Pond 37P : Pond 2-6 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 69,441 98 Roofs, HSG C 10,782 98 Water Surface, 0% imp, HSG C 80,223 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" 0.3 40 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 4.8 1,622 0.0370 5.63 1.74 Pipe Channel, 12.0" Round w/ 7.0" inside fill Area= 0.3 sf Perim= 2.4' r= 0.13' n= 0.013 6.7 1,762 Total, Increased to minimum Tc = 10.0 min Subcatchment 36S: Basin 2-6 Hydrograph Runoff 14 13.04 cfs 13

Runoff 14 13.04 cfs 13 NOAA 24-hr D 12 11 100-Year Rainfall=8.66" 10 Runoff Area=80,223 sf 9 Runoff Volume=1.292 af Flow (cfs) 8 Runoff Depth=8.42" 7 6 Flow Length=1,762' 5 Tc=10.0 min 4 CN=98/98 3 2 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)