2022 08 Drainage Report

2022-07-21 Existing Hydrology NOAA 24-hrD 10-Year Rainfall=5.22" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC P: 4 Summary for Subcatchment 1S: Mt. Pleasant Ave. - Imp. Runoff = 0.19 cfs @ 12.33 hrs, Volume= 0.026 af, Depth= 4.98" Routed to Link 2L : Mt. Pleasant Ave. 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 2,345 98 Unconnected pavement, HSG C '351__98__Unconnected pavement, HSG B 2,696 98 Weighted Average 2.696 10.00% Impervious Area 2.696 4100.00% Unconnected Te Length Slope Velocity Capacity Description (min) _(feet)__(fft)__(f/sec) (cfs) 22.4 100 0.0165 0.07 ‘Sheet Flow, Sheet Flow (AB) Woods: Light underbrush n= 0.400 P2= 3.44" 14 230 0.0489 3.56 Shallow Concentrated Flow, SCF - Unpaved (BC) Unpaved _Kv= 16.1 fps 23.5 330 Total ‘Subcatchment 1S: Mt. Pleasant Ave. - Imp. Hydrograph NOAA 24-hr D 10-Year Rainfall=5.22"- Runoff Area=2,696 sf Runoff Volume=0.026 af Runoff Depth=4.98" Flow Length=330° Tc=23.5 min CN=98 Og H GO tote Vs 46 toa aes 2 28 9092 9 9 3 4042 4448480 BE 04 G6 £060 204 COS 7072 Time 2022-07-21 Exi: ing Hydrology Prepared by Dynamic Engineering NOAA 24-hr D 10-Year Rainfall=5.22" Printed 8/5/2022 HydroCAD® 10.20-2d sin 08640 © 2021 HydroCAD Software Solutions LLC. Page 16 Hydrograph for Subcatchment 1S: Mt. Pleasant Ave. - Imp. Time Precip. Excess Time Precip. Excess Runoff (fs)