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 21 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 35S: DA 2 Und - Imp Runoff = 3.49 cfs @ 12.16 hrs, Volume= Routed to Link 34L : DA 2 Undetained 14,033 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) 19,504 33,009 52,513 52,513 Tc (min) 8.8 Length (feet) 100 0.3 60 9.1 160 CN 98 98 98 Description Paved parking, HSG C Paved parking, HSG D Weighted Average 100.00% Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0600 0.19 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" 0.0600 3.94 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps Total Subcatchment 35S: DA 2 Und - Imp Hydrograph Runoff 3.49 cfs Flow (cfs) 3 2 1 0 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=52,513 sf Runoff Volume=14,033 cf Runoff Depth=3.21" Flow Length=160' Slope=0.0600 '/' Tc=9.1 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)