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MSE 24-hr 3 100-Year Rainfall=7.36"Proposed Conditions - Filtration
<br /> Printed 12/27/2019Prepared by Larson Engineering
<br />Page 34HydroCAD® 10.00-21 s/n 01934 © 2018 HydroCAD Software Solutions LLC
<br />Primary OutFlow Max=17.95 cfs @ 13.07 hrs HW=883.08' TW=0.00' (Dynamic Tailwater)
<br />1=Culvert (Barrel Controls 17.95 cfs @ 10.16 fps)
<br />2=Orifice/Grate (Passes < 0.96 cfs potential flow)
<br />3=Exfiltration (Passes < 2.45 cfs potential flow)
<br />4=Sharp-Crested Rectangular Weir (Passes < 47.11 cfs potential flow)
<br />Summary for Pond P2: Back Yard Pond
<br />Inflow Area = 124,296 sf, 23.22% Impervious, Inflow Depth = 5.51" for 100-Year event
<br />Inflow = 11.12 cfs @ 12.57 hrs, Volume= 57,110 cf
<br />Outflow = 9.39 cfs @ 12.76 hrs, Volume= 57,108 cf, Atten= 16%, Lag= 11.5 min
<br />Primary = 9.39 cfs @ 12.76 hrs, Volume= 57,108 cf
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-90.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 885.53' @ 12.76 hrs Surf.Area= 9,251 sf Storage= 6,821 cf
<br />Plug-Flow detention time= 15.7 min calculated for 57,108 cf (100% of inflow)
<br />Center-of-Mass det. time= 15.6 min ( 823.0 - 807.3 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 884.00' 33,006 cf Custom Stage Data (Prismatic) Listed below (Recalc)
<br />Elevation Surf.Area Inc.Store Cum.Store
<br />(feet) (sq-ft) (cubic-feet) (cubic-feet)
<br />884.00 1,526 0 0
<br />885.00 4,715 3,121 3,121
<br />886.00 13,276 8,996 12,116
<br />887.00 28,503 20,890 33,006
<br />Device Routing Invert Outlet Devices
<br />#1 Primary 884.00'21.0" Round Culvert
<br />L= 129.0' RCP, square edge headwall, Ke= 0.500
<br />Inlet / Outlet Invert= 884.00' / 882.71' S= 0.0100 '/' Cc= 0.900
<br />n= 0.011 Concrete pipe, straight & clean, Flow Area= 2.41 sf
<br />Primary OutFlow Max=9.39 cfs @ 12.76 hrs HW=885.53' TW=0.00' (Dynamic Tailwater)
<br />1=Culvert (Inlet Controls 9.39 cfs @ 4.21 fps)
<br />Summary for Pond P3: South Pond
<br />Inflow Area = 54,213 sf, 10.49% Impervious, Inflow Depth = 5.25" for 100-Year event
<br />Inflow = 5.53 cfs @ 12.43 hrs, Volume= 23,706 cf
<br />Outflow = 5.16 cfs @ 12.53 hrs, Volume= 23,703 cf, Atten= 7%, Lag= 6.0 min
<br />Primary = 5.16 cfs @ 12.53 hrs, Volume= 23,703 cf
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-90.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 885.54' @ 12.53 hrs Surf.Area= 3,034 sf Storage= 2,313 cf
<br />Plug-Flow detention time= 16.9 min calculated for 23,700 cf (100% of inflow)
<br />Center-of-Mass det. time= 17.1 min ( 822.4 - 805.4 )
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