2022 08 Drainage Report

2022-07-28 Proposed Hydrology NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC Summary for Pond 3P: Basin A Inflow Area= 0.669 ac, 15.97% Impervious, Inflow Depth= 1.52" for 2-Year event Inflow = — 0.94cfs@ 12.18 hrs, Volume= 0.085 af Outfow = — 0.00cfs@ 0.00 hrs, Volume= 0,000 af, Atten= 100%, Lag= 0.0 min Primary = — 0.00cfs@ 0.00 hrs, Volume= 0.000 af Routed to Link 2L : Mt. Pleasant Ave. Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 625.54’ @ 24.60 hrs Surf.Area= 2,861 sf Storage= 3,691 cf (not calculated: initial storage exceeds outflow) ‘not calculated: no outfiow) Plug-Flow detention ti Center-of-Mass det. ti Volume Invert___Avail.Storage_ Storage Description #4 624.00" 8,561 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 624.00 7,951 0 0 625.00 2.519 2,235 2,235 626.00 3,150 2,835 5,070 627.00 3,833 3,492 8,561 Device Routing Invert__Outlet Devices #1 Primary 626.00’ 6.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads rimary OutFlow Max=0.00 cfs @ 0.00 hrs HW=624,00' (Free Discharge) |=Orifice/Grate (Controls 0.00 cfs) 2022-07-28 Proposed Hydrology NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Dynamic Engineering Printed 9/5/2022 HydroCAD® 10.20-2d_s/n 08640_© 2021 HydroCAD Software Solutions LLC Pond 3P: Basin A Hydrograph Inflow Area=0.669 ac Peak Elev=625.54" Storage=3,691 cf Flow (os) © 2 4 6 © 1012 14 10 8 20 22 24 26.28 30.92 94 96 38 40 42 44 40 40 50 52 54 56 56.00 02 64 GO 63.70.72 ‘Timo (hours) Pond 3P: Basin A Stage-Discharge Elevation (feet) cor 0 G08 01 O18 02 O25 03 O55 04 O48 05 O55 08 08S OF OFS O8 OBS 09 Discharge (cfs) 30