2022 08 Drainage Report

2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" 2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Dynamic Engineering Printed 8/5/2022 Prepared by Dynamic Engineering Printed 9/5/2022 HydroCAD® 10.20-2d s/n 08640 © 2021 Hi HydroCAD® 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC. ‘Summary for Pond 5P: Basin C Pond 5P: Basin C Hydrograph Inflow Area= 0.821 ac, 12.95% Impervious, Inflow Depth = 2.86" for 10-Year event Inflow = —-2.24cfs@ 12.18 hrs, Volume= 0.196 af re) Outflow = 0.18 cis@ 13.74 hrs, Volume= 0.077 af, Atten= 92%, Lag= 93.6 min Primary = 0.18cfs@ 13.74hrs, Volume= 0.077 af _ Inflow Area=0.821 ac Routed to Link 2L : Mt. Pleasant Ave. Peak Elev=620.59" Storage=5,470 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 620.59' @ 13.74 hrs Surf.Area= 3,285 sf Storage= 5,470 cf Plug-Flow detention time= 369.8 min calculated for 0.077 af (39% of inflow) g Center-of-Mass det. time= 222.9 min ( 1,050.5 - 827.5 ) & Volume ___Invert__Avail.Storage Storage Description i "1 618.50" 8,744 cf_ Custom Stage Data (Prismatic) Listed below (Recalc) Elevation SurfArea Inc.Store - Cum.Store (feet) (sa-ft) __(cubic-feet) __(cubic-feet) 618.50 1,966 0 0 619.00 2,285 1,063 1,083 620.00 2.892 2,589 3,651 621.00 3560 3226 e877 OTe a 8 toe Yo WoDO Beat 268903. 36 384042 40400 49 060 040807072 621.50 3,907 1,867 8,744 Device _ Routing Invert__Qutlet Devices Pond 5P: Basin C #1 Primary 620.50' 8,0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Stage-Dischargo Frimary OutFlow Max=0.18 cfs @ 13.74 hrs HW=620.59' (Free Discharge) {| |=Orifice/Grate (Weir Controls 0.18 cfs @ 0.98 fps) eat i é ty 7 Discharge (cfs)