240916_40 ERW Stormwater Report FULL

NOAA 24-hr D 2-Year Rainfall=3.44"240913_40 ERW Waymaker Proposed Printed 9/16/2024Prepared by Colliers Engineering & Design Page 32HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment PR-2B-P: Runoff = 0.04 cfs @ 12.16 hrs, Volume= 0.003 af, Depth= 1.20" Routed to Pond 11P : Existing Drywell System Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) CN Description 1,446 74 >75% Grass cover, Good, HSG C 1,446 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.5 69 0.0170 0.15 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.4 31 0.0220 1.17 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.44" 0.1 14 0.0180 2.72 Shallow Concentrated Flow, Paved Kv= 20.3 fps 8.0 114 Total Subcatchment PR-2B-P: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 0.046 0.044 0.042 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=1,446 sf Runoff Volume=0.003 af Runoff Depth=1.20" Flow Length=114' Tc=8.0 min CN=74 0.04 cfs This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.