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 33 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 53S: Basin 9 - Imp Runoff = 1.13 cfs @ 12.14 hrs, Volume= Routed to Pond 42P : Basin 9 4,311 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) 6,889 9,244 16,133 16,133 Tc (min) 7.2 Length (feet) 100 0.2 40 7.4 140 CN 98 98 98 Description Paved parking, HSG D Paved parking, HSG C Weighted Average 100.00% Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.1000 0.23 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" 0.0750 4.41 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps Total Subcatchment 53S: Basin 9 - Imp Hydrograph Runoff 1.13 cfs Flow (cfs) 1 0 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=16,133 sf Runoff Volume=4,311 cf Runoff Depth=3.21" Flow Length=140' Tc=7.4 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)