Revised Stormwater Management Report

POA 1 proposed 2024-05-12 HydroCad - Proposed POA 1 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 69 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 22S: Basin 6 - Imp Runoff = 23.28 cfs @ 12.11 hrs, Volume= Routed to Pond 24P : Basin 6 79,870 cf, Depth= 8.42" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf) 10,890 26,136 41,818 34,987 113,831 113,831 CN 98 98 98 98 98 Tc (min) 0.6 Length (feet) 40 3.0 3.6 450 490 Description Roofs, HSG D Paved parking, HSG D Roofs, HSG C Paved parking, HSG C Weighted Average 100.00% Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0200 1.19 Sheet Flow, Sheet Flow (A-B) Smooth surfaces n= 0.011 P2= 3.47" 2.50 Direct Entry, Pipe Flow (B-C) Total Subcatchment 22S: Basin 6 - Imp Flow (cfs) Hydrograph 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Runoff 23.28 cfs 0 2 4 6 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=113,831 sf Runoff Volume=79,870 cf Runoff Depth=8.42" Flow Length=490' Slope=0.0200 '/' Tc=3.6 min CN=98 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)