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 5 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 21S: Basin 4 - Imp Runoff = 3.77 cfs @ 12.12 hrs, Volume= Routed to Pond 22P : Basin 4 13,377 cf, Depth= 3.21" 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) 6,970 43,091 50,061 50,061 Tc (min) 0.9 Length (feet) 70 4.6 5.5 685 755 CN 98 98 98 Description Roofs, HSG D Paved parking, HSG C Weighted Average 100.00% Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0200 1.33 Sheet Flow, Sheet Flow (A-B) Smooth surfaces n= 0.011 P2= 3.47" 2.50 Direct Entry, Pipe Flow (B-C) Total Subcatchment 21S: Basin 4 - Imp Hydrograph 4 Flow (cfs) 3 2 1 0 Runoff 3.77 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=50,061 sf Runoff Volume=13,377 cf Runoff Depth=3.21" Flow Length=755' Slope=0.0200 '/' Tc=5.5 min CN=98 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)