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 9 Summary for Subcatchment 23S: Basin 5 Runoff = 4.83 cfs @ 12.19 hrs, Volume= 0.466 af, Depth= 2.46" Routed to Pond 24P : Infiltration basin 5 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 62,281 98 Roofs, HSG D 36,803 74 >75% Grass cover, Good, HSG C 99,084 89 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.1 100 0.0170 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 1.0 164 0.0305 2.62 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.1 50 0.0760 5.60 Shallow Concentrated Flow, Paved Kv= 20.3 fps 11.3 314 Total Subcatchment 23S: Basin 5 Hydrograph Runoff 5 4.83 cfs NOAA 24-hr D 2-Year Rainfall=3.44" 4

-hr D 2-Year Rainfall=3.44" 4 Runoff Area=99,084 sf Runoff Volume=0.466 af Flow (cfs) 3 Runoff Depth=2.46" Flow Length=314' 2 Tc=11.3 min CN=74/98 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)