05 Stormwater Statementrcd 10 14 24

NOAA 24-hr D 100-Year Rainfall=8.66"2024-10-08_HydroCAD Calcs Printed 10/8/2024Prepared by Stonefield Engineering & Design Page 34HydroCAD® 10.20-5a s/n 10626 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment E-1: Existing Drainage to Franklin Avenue Municipal System Runoff = 1.83 cfs @ 12.13 hrs, Volume= 6,660 cf, Depth= 7.99" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.02 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf) CN Description * 8,524 98 Impervious Area 1,476 74 >75% Grass cover, Good, HSG C 10,000 94 Weighted Average 1,476 74 14.76% Pervious Area 8,524 98 85.24% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum ToC Subcatchment E-1: Existing Drainage to Franklin Avenue Municipal System Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 2 1 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=10,000 sf Runoff Volume=6,660 cf Runoff Depth=7.99" Tc=6.0 min CN=74/98 1.83 cfs