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MSE 24-hr 3 10-Year Rainfall=4.19"Proposed Conditions - Filtration
<br /> Printed 12/27/2019Prepared by Larson Engineering
<br />Page 23HydroCAD® 10.00-21 s/n 01934 © 2018 HydroCAD Software Solutions LLC
<br />Primary OutFlow Max=9.02 cfs @ 13.04 hrs HW=881.25' TW=0.00' (Dynamic Tailwater)
<br />1=Culvert (Passes 9.02 cfs of 15.02 cfs potential flow)
<br />2=Orifice/Grate (Orifice Controls 0.78 cfs @ 8.90 fps)
<br />3=Exfiltration (Passes 0.78 cfs of 2.14 cfs potential flow)
<br />4=Sharp-Crested Rectangular Weir (Weir Controls 8.24 cfs @ 2.84 fps)
<br />Summary for Pond P2: Back Yard Pond
<br />Inflow Area = 124,296 sf, 23.22% Impervious, Inflow Depth = 2.61" for 10-Year event
<br />Inflow = 5.27 cfs @ 12.57 hrs, Volume= 27,005 cf
<br />Outflow = 4.77 cfs @ 12.72 hrs, Volume= 27,002 cf, Atten= 9%, Lag= 9.0 min
<br />Primary = 4.77 cfs @ 12.72 hrs, Volume= 27,002 cf
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-90.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 884.99' @ 12.72 hrs Surf.Area= 4,688 sf Storage= 3,081 cf
<br />Plug-Flow detention time= 18.6 min calculated for 26,999 cf (100% of inflow)
<br />Center-of-Mass det. time= 18.8 min ( 836.9 - 818.1 )
<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=4.77 cfs @ 12.72 hrs HW=884.99' TW=0.00' (Dynamic Tailwater)
<br />1=Culvert (Inlet Controls 4.77 cfs @ 3.39 fps)
<br />Summary for Pond P3: South Pond
<br />Inflow Area = 54,213 sf, 10.49% Impervious, Inflow Depth = 2.38" for 10-Year event
<br />Inflow = 2.53 cfs @ 12.46 hrs, Volume= 10,769 cf
<br />Outflow = 2.33 cfs @ 12.55 hrs, Volume= 10,766 cf, Atten= 8%, Lag= 5.7 min
<br />Primary = 2.33 cfs @ 12.55 hrs, Volume= 10,766 cf
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-90.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 885.16' @ 12.55 hrs Surf.Area= 2,376 sf Storage= 1,302 cf
<br />Plug-Flow detention time= 24.4 min calculated for 10,766 cf (100% of inflow)
<br />Center-of-Mass det. time= 24.2 min ( 843.0 - 818.8 )
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