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 97 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 31S: Basin 7 - Imp Runoff = 4.28 cfs @ 12.20 hrs, Volume= Routed to Pond 49P : Basin 7 19,438 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) 15,723 31,089 46,812 46,812 Tc (min) 8.9 Length (feet) 83 1.1 272 0.1 40 2.4 12.5 365 760 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) 0.0400 0.15 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Using McCuen-Spiess flow length 0.0600 3.94 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 0.0670 5.25 Shallow Concentrated Flow, SCF (C-D) Paved Kv= 20.3 fps 2.50 Direct Entry, Pipe Flow Total Subcatchment 31S: Basin 7 - Imp Hydrograph Runoff 4.28 cfs 4 Flow (cfs) 3 2 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=46,812 sf Runoff Volume=19,438 cf Runoff Depth=4.98" Flow Length=760' Tc=12.5 min CN=98 1 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)