2022 08 Drainage Report

2022-07-21 Existing Hydrology Prepared by Dynamic Engineering NOAA 24-hr D 100-Year Rainfall=8.66" Printed 8/5/2022 2022-07-21 Existing Hydrology NOAA 24-hr D.100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 9/5/2022 HydroCAD® 10.20-2d_s/n 08640_© 2021 HydroCAD Software Solutions LLC Page 24 Summary for Subcatchment 3S: Mt. Pleasant Ave. - Perv. Runoff = 12.53cfs@ 12.36 hrs, Volume= 4.531 af, Depth= 5.04" 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 100-Year Rainfali=8.66" Area(sf)__CN Description 185,762 70 Woods, Good, HSG C 2,359 77 Woods, Good, HSG D 749__74__>75% Grass cover, Good, HSG C 188,870 70 Weighted Average 188,870 10.00% Pervious Area Te Length Slope Velacity Capacity Description (min) (feet) __(f/ft)__(f/sec) (cfs) 24.2 100 0.0135 = (0.07 ‘Sheet Flow, Sheet Flow (AB) Woods: Light underbrush n= 0.400 P2= 3.44" ‘Shallow Concentrated Flow, SCF - Unpaved (BC) Unpaved _Kv= 16.1 fps. 0.6 145 0.0672 4.17 24.8 245 Total Subcatchment 3S: Mt. Pleasant Ave. - Perv. Hydrograph é ~ NOAA 24-hr D 1" 100-Year Rainfall=8.66" Runoff Area=158,870 sf Runoff Volume=1.531 af Runoff Depth=5.04" Flow Length=245" Tc=24.8 min CN=70 Flow (cfs)