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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 12HydroCAD® 10.00-21 s/n 01934 © 2018 HydroCAD Software Solutions LLC <br />Primary OutFlow Max=1.30 cfs @ 14.50 hrs HW=880.63' TW=0.00' (Dynamic Tailwater) <br />1=Culvert (Passes 1.30 cfs of 13.87 cfs potential flow) <br />2=Orifice/Grate (Orifice Controls 0.70 cfs @ 8.05 fps) <br />3=Exfiltration (Passes 0.70 cfs of 2.03 cfs potential flow) <br />4=Sharp-Crested Rectangular Weir (Weir Controls 0.60 cfs @ 1.17 fps) <br />Summary for Pond P2: Back Yard Pond <br />Inflow Area = 124,296 sf, 23.22% Impervious, Inflow Depth = 1.45" for 2-Year event <br />Inflow = 2.88 cfs @ 12.58 hrs, Volume= 15,025 cf <br />Outflow = 2.59 cfs @ 12.74 hrs, Volume= 15,023 cf, Atten= 10%, Lag= 9.3 min <br />Primary = 2.59 cfs @ 12.74 hrs, Volume= 15,023 cf <br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-90.00 hrs, dt= 0.01 hrs <br />Peak Elev= 884.70' @ 12.74 hrs Surf.Area= 3,774 sf Storage= 1,868 cf <br />Plug-Flow detention time= 23.2 min calculated for 15,021 cf (100% of inflow) <br />Center-of-Mass det. time= 23.4 min ( 849.0 - 825.6 ) <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=2.59 cfs @ 12.74 hrs HW=884.70' TW=0.00' (Dynamic Tailwater) <br />1=Culvert (Inlet Controls 2.59 cfs @ 2.86 fps) <br />Summary for Pond P3: South Pond <br />Inflow Area = 54,213 sf, 10.49% Impervious, Inflow Depth = 1.26" for 2-Year event <br />Inflow = 1.32 cfs @ 12.46 hrs, Volume= 5,708 cf <br />Outflow = 1.16 cfs @ 12.59 hrs, Volume= 5,705 cf, Atten= 12%, Lag= 7.7 min <br />Primary = 1.16 cfs @ 12.59 hrs, Volume= 5,705 cf <br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-90.00 hrs, dt= 0.01 hrs <br />Peak Elev= 884.96' @ 12.59 hrs Surf.Area= 2,051 sf Storage= 852 cf <br />Plug-Flow detention time= 33.3 min calculated for 5,705 cf (100% of inflow) <br />Center-of-Mass det. time= 33.3 min ( 862.4 - 829.1 )