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 81HydroCAD® 10.20-2g s/n 04431 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment EX 3 - P: Runoff = 0.86 cfs @ 12.15 hrs, Volume= 0.067 af, Depth= 2.72" Routed to Reach 3R : 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 10-Year Rainfall=5.22" Area (sf) CN Description 11,505 74 >75% Grass cover, Good, HSG C 1,312 89 Gravel roads, HSG C 12,817 76 Weighted Average 12,817 100.00% 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 EX 3 - P: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=12,817 sf Runoff Volume=0.067 af Runoff Depth=2.72" Flow Length=109' Tc=7.8 min CN=76 0.86 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.