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MSE 24-hr 3 2-Year Rainfall=2.81"Proposed Conditions - Filtration
<br /> Printed 12/27/2019Prepared by Larson Engineering
<br />Page 11HydroCAD® 10.00-21 s/n 01934 © 2018 HydroCAD Software Solutions LLC
<br />Summary for Pond P1: North Pond with Forebay
<br />Inflow Area = 651,998 sf, 31.54% Impervious, Inflow Depth = 1.57" for 2-Year event
<br />Inflow = 19.96 cfs @ 12.17 hrs, Volume= 85,459 cf
<br />Outflow = 1.30 cfs @ 14.50 hrs, Volume= 85,460 cf, Atten= 93%, Lag= 139.6 min
<br />Primary = 1.30 cfs @ 14.50 hrs, Volume= 85,460 cf
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-90.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 880.63' @ 14.50 hrs Surf.Area= 54,812 sf Storage= 56,690 cf
<br />Plug-Flow detention time= (not calculated: outflow precedes inflow)
<br />Center-of-Mass det. time= 798.2 min ( 1,603.5 - 805.3 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 878.00' 9,427 cf Forebay (Prismatic) Listed below (Recalc) -Impervious
<br />#2 877.99' 28,398 cf Infiltration Area (Prismatic) Listed below (Recalc)
<br />#3 880.01' 209,850 cf Main Pond (Prismatic) Listed below (Recalc)
<br />247,675 cf Total Available Storage
<br />Elevation Surf.Area Inc.Store Cum.Store
<br />(feet) (sq-ft) (cubic-feet) (cubic-feet)
<br />878.00 3,593 0 0
<br />879.00 4,688 4,141 4,141
<br />880.00 5,884 5,286 9,427
<br />Elevation Surf.Area Voids Inc.Store Cum.Store
<br />(feet)(sq-ft) (%) (cubic-feet) (cubic-feet)
<br />877.99 15,971 0.0 0 0
<br />878.00 15,971 40.0 64 64
<br />878.99 19,377 40.0 6,999 7,063
<br />879.00 19,377 100.0 194 7,257
<br />880.00 22,906 100.0 21,142 28,398
<br />Elevation Surf.Area Inc.Store Cum.Store
<br />(feet)(sq-ft) (cubic-feet) (cubic-feet)
<br />880.01 29,109 0 0
<br />881.00 33,587 31,035 31,035
<br />882.00 38,188 35,888 66,922
<br />883.00 42,889 40,539 107,461
<br />884.00 47,691 45,290 152,751
<br />885.00 66,508 57,100 209,850
<br />Device Routing Invert Outlet Devices
<br />#1 Primary 876.37'18.0" Round Culvert
<br />L= 175.0' RCP, square edge headwall, Ke= 0.500
<br />Inlet / Outlet Invert= 876.37' / 875.50' S= 0.0050 '/' Cc= 0.900
<br />n= 0.011 Concrete pipe, straight & clean, Flow Area= 1.77 sf
<br />#2 Device 1 877.67'4.0" Vert. Orifice/Grate C= 0.600
<br />#3 Device 2 877.99'1.600 in/hr Exfiltration over Surface area
<br />#4 Device 1 880.50'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
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