2022 08 Drainage Report

NOAA 24-hr D 100-Year Rainfall=8.66" 2022-07-28 Proposed Hydrology ee Printed 8/5/2022 4 Prepared by Dynamic Engineering HydroCAD® 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC ‘Summary for Pond 4P: Basin B Inflow Area = 0.831 ac, 12.83% Impervious, Inflow Depth = 5.89" for 100-Year event Inflow = = 4.67 cls @ 12.17 hrs, Volume= 0.408 af Outflow = 1.02 cfs@ 12.64 hrs, Volume= 0.306 af, Atten= 78%, Lag= 27.8 min Primary = 1.02cfs@ 12.64 hrs, Volume= 0.306 af Routed to Link 2L : Mt. Pleasant Ave. Routing by Stor-Ind method Peak Elev= 624.97' @ 12. Plug-Flow detention time= 201.2 min calculated for 0.306 af (75% of inflow) Center-of-Mass det. time= 105.6 min ( 915.7 - 810.1 ) ime Span= 0,00-72.00 hrs, dt= 0.05 hrs rs. Surf.Area= 3,811 sf Storage= 8,436 of Volume __Invert__Avail,Storage _ Storage Description 8,561 cf Custom Stage Data (Prismatic) Listed below (Recalc) ca 622.00" Elevation Surf.Area Inc.Store Cum.Store cubic-feet) (cubic-feet) 622.00 1,951 0 0 623.00 2,519 2,235 2,235 624.00 3,150 2,835 5,070 625.00 3,833 3,492 8,561 Device _Routing Invert __Outlet Devices #4 Primary 623.80' 6.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads rimary OutFlow Max=1.02 cfs @ 12.64 hrs HW=624.97' (Free Discharge) =OrificelGrate (Orifice Controls 1.02 cfs @ 5.20 fps) 2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering HydroCAD® 10.20-2d s/n 08640 © 2024 HydroCAD Software Solutions LLC NOAA 24-hr D 100-Year Rainfall=8.66" Printed 8/5/2022 Page 136 Pond 4P: Basin B Hydrograph Inflow Area=0.831 ac Peak Elev=624.97' Storage=8,436 cf Flow (fs) 2 46 8 M0 2 tet tab 2424 228 9052 3838404 4 4848 BOS 6 0 9800 2 408087072 2 (hours) Pond 4P: Basin B ‘Stage-Discharge Elevation (Fest) Discharge (cfs) es)