2022 08 Drainage Report

2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5,22" Prepared by Dynamic Engineering Printed 8/5/2022 © 2021 HydroCAD Software Solutions LLC P: 72 Summary for Pond 3P: Basin A Inflow Area = 0.669 ac, 15.97% Impervious, Inflow Depth = 2.93" for 10-Year event Inflow = = 1.87 cfs @ 12.17 hrs, Volume= 0.163 af Outflow = 0.09 cfs @ 15.32 hrs, Volume= 0.047 af, Atten= 95%, Lag= 188.8 min Primary = 0.09 cfs @ 15.32 hrs, Volume= 0.047 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= 626.06 @ 15.32 hrs Surf,Area= 3,194 sf Storage= 5,275 cf Plug-Flow detention time= 479.7 min calculated for 0.047 af (29% of inflow) Center-of-Mass det, time= 309.1 min ( 1,132.2 - 823.1 ) Volume. Invert __Avail,Storage _Storage Description #1 624.00" 8,561 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation ‘Surf.Area Inc.Store ‘Cum.Store (feet) (sg-ft) (cubic-feet) (cubic-feet) 624.00 1,951 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 26.00’ 6.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads rimary OutFlow Max=0.08 fs @ 15.32 hrs HW=626.06' (Free Discharge) |=Orifice/Grate (Weir Controls 0.08 cfs @ 0.83 fps) 2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD@ 10.20-2d sin 08640 © 2021 HydroCAD Software Solutions LLC Pond 3P: Basin A Hydrograph Inflow Area=0.669 ac Peak Elev=626.06' Storage=5,275 cf Flow (cfs) 0-2-4 6 B 1012 1416 18.20 22 26 26 20 90:32 34 90 38 40 42 44 46 48 599 52 94 96 58 60 62 64 68 05.70 72 Time (hours) Pond 3P: Basin A ‘Stage-Discharge “ Eom Elevation (feat) Ce 0 Obs Of OW 02 G2 03 O55 O4 O45 OS O68 O68 OBS OT O15 08 Obs 09 DDlecharge (cts)