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HomeMy WebLinkAboutApplication Files_85048_pg0199 ' PRE-DEVELOPMENT DRAINAGE 2007-058 Jones-PRE Type ll/24-hr 10 year Rainfall=4.70" Prepared by J.R. Russo &Associates Printed 12/11/2010 HydroCAD®8.50 s/n 002386 02007 HVdroCAD Software Solutions LLC Page 9 I)iscarded OutFlow Max=3.96 cfs @ 13.38 hrs HW=82.59' (Free Discharge) 3=Exfiltration (Exfiltration Controls 3.96 cfs) Primary OutFlow Max=24.03 cfs @ 13.38 hrs HW=82.59' (Free Discharge) �l=Culvert (Inlet Controls 10.34 cfs @ 8.42 fps) 2=Sharp-Crested Vee/Trap Weir (Weir Controls 13.69 cfs @ 1.82 fps) Summary for Pond RS: Red Star Basin Inflow Area = 8.170 ac, 41.25% Impervious, Inflow Depth = 2.13" for 10-year event Inflow 19.66 cfs @ 12.10 hrs, Volume= 1.448 of Outflow 5.14 cfs @ 12.51 hrs, Volume= 1.448 af, Atten= 74%, Lag=24.6 min Discarded = 2.70 cfs @ 12.51 hrs, Volume= 0.851 of Primary = 2.44 cfs @ 12.51 hrs, Volume= 0.598 of Routing by Stor-Ind method, Time Span= 1.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 85.93' @ 12.51 hrs Surf.Area=38,874 sf Storage= 18,359 cf Plug-Flow detention time= 35.4 min calculated for 1.448 of(100% of inflow) Center-of-Mass det. time= 35.4 min (876.7-841.3) Volume Invert Avail.Storage Storage Description #1 84.90' 65,565 cf Custom Stage Data(Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet). 84.90 10 0 0 85.00 400 20 20 86.00 41,600 21,000 21,021 87.00 47,488 44,544 65,565 Device Routing Invert Outlet Devices #1 Primary 84.90' 12.0" x 680.0' long Culvert RCP, mitered to conform to fill, Ke= 0.700 Outlet Invert= 81.50' S= 0.0050 T Cc= 0.900 n=.0.012 #2 Discarded 84.90' 3.000 in/hr Exfiltration over Surface area Qiscarded OutFlow Max=2.70 cfs @ 12.51 hrs HW=85.93' (Free Discharge) 2=Exfiltration (Exfltration Controls 2.70 cfs) ' Primary OutFlow Max=2.44 cfs @ 12.51 hrs HW=85.93' (Free Discharge) L1=Culvert (Inlet Controls 2.44 cfs @ 3.10 fps)