complete drainage report rev 9

POA-2 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 11 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 20S: 15775.6 Runoff = 0.43 cfs @ 12.16 hrs, Volume= Routed to Pond 21P : Basin 3 1,507 cf, Depth= 1.20" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) 15,086 15,086 CN 74 Description >75% Grass cover, Good, HSG C 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.3 75 0.0400 0.15 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Sheet Flow (A-B) Subcatchment 20S: 15775.6 Subcatchment 20S: 15775.6 Flow (cfs) Hydrograph 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Runoff 0.43 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=15,086 sf Runoff Volume=1,507 cf Runoff Depth=1.20" Flow Length=75' Slope=0.0400 '/' Tc=8.3 min CN=74 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 74 76 78 80 Time (hours)