Drainage Report

Basin 2-3 without exfiltration Proposed Basin 2-3 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 31 Summary for Subcatchment 40S: Basin 2-3 Runoff = 14.34 cfs @ 12.18 hrs, Volume= 1.353 af, Depth= 7.19" Routed to Pond 44P : pond 2-3 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 41,793 74 >75% Grass cover, Good, HSG C 46,190 98 Roofs, HSG C 10,412 98 Water Surface, 0% imp, HSG C 98,395 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 100 0.0300 0.21 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.4 60 0.0330 2.72 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.2 72 0.0800 5.74 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.9 1,326 0.0300 11.85 14.55 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.010 10.5 1,558 Total