Revised Stormwater Management Report

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 3 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 20S: Basin 3 - Perv Runoff = 0.55 cfs @ 12.16 hrs, Volume= Routed to Pond 21P : Basin 3 1,922 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) 19,242 19,242 Tc (min) 8.3 Length (feet) 75 CN 74 Description >75% Grass cover, Good, HSG C 100.00% Pervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0400 0.15 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Subcatchment 20S: Basin 3 - Perv Hydrograph Runoff 0.6 0.55 cfs 0.55 0.5 0.45 Flow (cfs) 0.4 0.35 0.3 0.25 0.2 0.15 0.1 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=19,242 sf Runoff Volume=1,922 cf Runoff Depth=1.20" Flow Length=75' Slope=0.0400 '/' Tc=8.3 min CN=74 0.05 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 74 76 78 80 Time (hours)