2022 08 Drainage Report

2022-07-28 Proposed Hydrology NOAA 24-hr D 100-Year Raintall=8.66" 2022-07-28 Proposed Hydrology NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 8/5/2022 Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d_s/n 08640 © 2021 Hy \D Software Solutions LLC 7 Hy 40.20-24_sin 08640 © 2021 HydroCAD Software Solutions LLC Et ‘Summary for Pond 6P: Basin D Pond 6P: Basin D Hydrograph Inflow Area= 0.422. ac, 13.06% Impervious, Inflow Depth = 5.90" for 100-Year event Inflow = 2.37 cfs@ 12.17 hrs, Volume= 0.207 af Outflow = — 0.82cfs@ 12.43 hrs, Volume= 0.125 af, Atten= 65%, Lag= 15.7 min Primary = 0.82cfs@ 12.43 hrs, Volume= 0.125 af Inflow Area=0.422 ac Routed fo Link 21: Mt, Pieasant Ave. : Peak Elev=616.75 Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs = Peak Elev= 616.75' @ 12.43 hrs SurfArea= 2,990 sf Storage= 4,291 cf Storage=4,291 cf Plug-Flow detention time= 235.1 min calculated for 0.126 af (60% of Center-of-Mass det. time= 118.5 min ( 928.4 - 809.9 ) Flow (cfs) Volume ____Invert__A\ 7 615.00 8,561 of Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 615.00 1,951 0 0 616.00 2.519 2,235 2,235 617.00 3,150 2,835 5,070 618.00 3,833 3.492 8.561 O24 6 6 Mo IZ 1020221 2628 02 303-40 2 46404 202 4 890 OD G2 46008 7072 Device Routing Invert_Outlet Devices #1 Primary 616.50° 8.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Pond 6P: Basin D Stage-Dischargo rimary OutFlow Max=0.83 cfs @ 12.43 hrs HW=616.75' (Free Discharge) 4=Orifice/Grate (Orifice Controls 0.83 cfs @ 2.39 fps) [can | Elevation (feet) cr a 7 Discharge (cfs)