240916_40 ERW Stormwater Report FULL

NOAA 24-hr D 10-Year Rainfall=5.22"240913_40 ERW Waymaker Proposed Printed 9/16/2024Prepared by Colliers Engineering & Design Page 79HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment EX 2-P: Runoff = 1.92 cfs @ 12.18 hrs, Volume= 0.162 af, Depth= 2.54" Routed to Reach 2R : CHANNEL 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 10-Year Rainfall=5.22" Area (sf) CN Description 32,438 74 >75% Grass cover, Good, HSG C 989 89 Gravel roads, HSG C 33,427 74 Weighted Average 33,427 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.4 100 0.0200 0.18 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.4 47 0.0170 2.10 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.3 88 0.0680 4.20 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.0 16 0.4200 10.43 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 10.1 251 Total Subcatchment EX 2-P: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 2 1 0 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=33,427 sf Runoff Volume=0.162 af Runoff Depth=2.54" Flow Length=251' Tc=10.1 min CN=74 1.92 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.