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 roCAD® 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC 4 ‘Summary for Pond 5P; Basin C Inflow Area = 0.821 ac, 12.95% impervious, Inflow Depth = 1.46" for 2-Year event Inflow = 4.12cfs@ 12.18hrs, Volume= 0.100 af Outfiow = 0.00 cfs @ 0.00 hrs, Volume= 0,000 af, Atten= 100%, Lag= 0.0 min Primary = 0.00 cfs @ 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= 620.24' @ 24.60 hrs SurfArea= 3,049 sf Storage= 4,350 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume. Invert___Availl Storage _ Storage Description ca 618.50" 8,744 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation ‘Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 618.50 1,966 0) 0 619.00 2,285 4,063 1,063, 620.00 2,892 2,589 3,651 621.00 3,560 3,226 6,877 621.50 3,907 1,867 8,744 Device Routing Invert __Outlet Devices #1 Primary 620.50' 8.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads imary OutFlow Max=0.00 cfs @ 0.00 hrs HW=618.50' (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 8/5/2022 HydroCAD® 10.20-2d sin 08640 © 2021 HydroCAD Software Solutions LLC Page 42 Pond 5P: Basin C Hydrograph eS) Inflow Area=0.821 ac Peak Elev=620.24' Storage=4,350 cf Flow (cfs) © 2 4 6 8 1042 $4 6 820 22 24 26 20 30 32 34 30 38 40 42 44 46 40 50 52 54 $6 58 60 62 64 60 68 70 72 ‘Time (hours) Pond 5P: Basin C ‘Stage-Discharge eat Elevation (oet) § i] 7 Discharge (cfs)