241018_42 ERW_Stormwater Report_compiled

NOAA 24-hr D 100-Year Rainfall=8.66"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 44HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PDA-1B(PERV): (new Subcat) Runoff = 8.79 cfs @ 12.14 hrs, Volume= 0.689 af, Depth= 6.13" Routed to Reach PDA-1B : (new Reach) 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 100-Year Rainfall=8.66" Area (sf) CN Description 39,275 74 >75% Grass cover, Good, HSG C 19,497 89 Gravel roads, HSG C 58,772 79 Weighted Average 58,772 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.2 100 0.0400 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.3 80 0.0812 4.59 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.5 180 Total Subcatchment PDA-1B(PERV): (new Subcat) Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 9 8 7 6 5 4 3 2 1 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=58,772 sf Runoff Volume=0.689 af Runoff Depth=6.13" Flow Length=180' Tc=7.5 min CN=79 8.79 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.