2022 08 Drainage Report

2022-07-28 Proposed Hydrology NOAA 24-hr D 2-Year Rainfall=3.44" 2022-07-28 Proposed Hydrology NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Dynamic Engineering Printed 9/5/2022 Prepared by Dynamic Engineering Printed 8/5/2022 HW “AD® 10,20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC 10.20-2d_s/n 08640 © 2021 HydroCAD Software Sotutions LLC Summary for Pond 4P: Basin B Pond 4P: Basin B Hydrograph Inflow Area= 0.831 ac, 12.83% Impervious, Inflow Depth = 1.46" for 2-Year event Inflow = —1.19cfs@ 12.18hrs, Volume= 0.101 af Outflow 0.00 cfs@ 0.00 hrs, Volume= 0,000 af, Atten= 100%, Lag= 0.0 min Primary 0.00 cfs@ _0.00hrs, Volume= 0.000 af Inflow Area=0.831 ac Routed to Link 2L : Mt, Pleasant Ave. Peak Elev=623.78" Routing by StorInd method, Time Span= 0,00-72.00 hrs, dt= 0.05 hrs = Peak Elev= 623.78' @ 24.60 hrs Surf.Area= 3,012 sf Storage= 4,396 cf Storage=4,396 cf Plug-Flow detention time= (not caloulate Center-of-Mass det. time= (not calculate Flow (cf) Volume __Invert__Avail.Storage Storage Description 1 622.00" 8,561 cf Custom Stage Data (Prismatic) Listed below (Recalo) Elevation Surf Area Inc.Store Cum.Store (feet) (sg-ft) (cubic-feet) (cubic-feet) 622.00 1,951 0 0 623.00 2,519 2,235 2,235 624.00 3,150 2,835 0 625.00 3,833 3,492 (0-2 4 6 8 3012 34 $6 18 20 22 24 26.28 90 92 34 90 38 40 42 44 40 48 50.52 S4 $6 58 00 62 64 66.60 70 72 “Time (hours) Device _ Routing Invert Outlet Devices 4 Primary 623.80 6.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Pond 4P: Basin B Stago-Discharge grimary QutFlow Max=0.00 cfs @ 0.00 hrs HW=622.00' (Free Discharge) |=Orifice/Grate ( Controls 0.00 cfs) a | Elevation (foot) Discharge (cfs)