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 28HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment PR 3 - P: Runoff = 0.30 cfs @ 12.15 hrs, Volume= 0.024 af, Depth= 1.20" Routed to Reach DP3 : TOTAL 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 10,406 74 >75% Grass cover, Good, HSG C 10,406 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.4 72 0.0280 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 1.4 28 0.1790 0.33 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.0 9 0.2220 7.59 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.8 109 Total Subcatchment PR 3 - P: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=10,406 sf Runoff Volume=0.024 af Runoff Depth=1.20" Flow Length=109' Tc=7.8 min CN=74 0.30 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.