Revised Stormwater Management Report

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 81 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 19S: Basin 3 - Imp Runoff = 3.40 cfs @ 12.15 hrs, Volume= Routed to Pond 21P : Basin 3 13,465 cf, Depth= 4.98" 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 10-Year Rainfall=5.22" Area (sf) 6,970 18,295 7,163 32,428 32,428 Tc (min) 8.3 Length (feet) 75 CN 98 98 98 98 Description Roofs, HSG D Roofs, HSG C Paved parking, HSG C Weighted Average 100.00% Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0400 0.15 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Subcatchment 19S: Basin 3 - Imp Hydrograph Runoff 3.40 cfs Flow (cfs) 3 2 1 0 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=32,428 sf Runoff Volume=13,465 cf Runoff Depth=4.98" Flow Length=75' Slope=0.0400 '/' Tc=8.3 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)