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MSE 24-hr 3 2-Year Rainfall=2.86"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 9HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Summary for Pond P2i: Infiltration Basin 2
<br />Inflow Area =0.488 ac, 37.70% Impervious, Inflow Depth = 1.50" for 2-Year event
<br />Inflow =1.12 cfs @ 12.15 hrs, Volume=0.061 af
<br />Outflow =0.60 cfs @ 12.26 hrs, Volume=0.061 af, Atten= 47%, Lag= 6.5 min
<br />Discarded =0.01 cfs @ 12.26 hrs, Volume=0.030 af
<br />Primary =0.59 cfs @ 12.26 hrs, Volume=0.031 af
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 945.15' @ 12.26 hrs Surf.Area= 1,164 sf Storage= 1,097 cf
<br />Plug-Flow detention time= 724.4 min calculated for 0.061 af (100% of inflow)
<br />Center-of-Mass det. time= 724.6 min ( 1,507.5 - 782.9 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 944.00'3,707 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 />944.00 744 0 0
<br />946.00 1,475 2,219 2,219
<br />947.00 1,500 1,488 3,707
<br />Device Routing Invert Outlet Devices
<br />#1 Discarded 944.00'0.250 in/hr Exfiltration over Surface area
<br />#2 Primary 942.00'8.0" Round Culvert L= 20.0' Ke= 0.500
<br />Inlet / Outlet Invert= 942.00' / 941.80' S= 0.0100 '/' Cc= 0.900
<br />n= 0.013, Flow Area= 0.35 sf
<br />#3 Device 2 945.00'12.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads
<br />Discarded OutFlow Max=0.01 cfs @ 12.26 hrs HW=945.15' (Free Discharge)
<br />1=Exfiltration (Exfiltration Controls 0.01 cfs)
<br />Primary OutFlow Max=0.59 cfs @ 12.26 hrs HW=945.15' TW=0.00' (Dynamic Tailwater)
<br />2=Culvert (Passes 0.59 cfs of 2.82 cfs potential flow)
<br />3=Orifice/Grate (Weir Controls 0.59 cfs @ 1.26 fps)
<br />Summary for Pond P3i: Infiltration Basin 3
<br />Inflow Area =1.114 ac, 19.12% Impervious, Inflow Depth = 1.17" for 2-Year event
<br />Inflow =2.03 cfs @ 12.16 hrs, Volume=0.108 af
<br />Outflow =0.83 cfs @ 12.32 hrs, Volume=0.108 af, Atten= 59%, Lag= 9.7 min
<br />Discarded =0.01 cfs @ 12.32 hrs, Volume=0.049 af
<br />Primary =0.82 cfs @ 12.32 hrs, Volume=0.059 af
<br />Secondary =0.00 cfs @ 0.00 hrs, Volume=0.000 af
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 953.18' @ 12.32 hrs Surf.Area= 1,893 sf Storage= 1,856 cf
<br />Plug-Flow detention time= (not calculated: outflow precedes inflow)
<br />Center-of-Mass det. time= 677.0 min ( 1,478.2 - 801.2 )
<br />MSE 24-hr 3 2-Year Rainfall=2.86"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 10HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Volume Invert Avail.Storage Storage Description
<br />#1 952.00'9,255 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 />952.00 1,250 0 0
<br />953.00 1,783 1,517 1,517
<br />955.00 2,970 4,753 6,270
<br />956.00 3,000 2,985 9,255
<br />Device Routing Invert Outlet Devices
<br />#1 Discarded 952.00'0.250 in/hr Exfiltration over Surface area
<br />#2 Primary 950.00'8.0" Round Culvert L= 30.0' Ke= 0.500
<br />Inlet / Outlet Invert= 950.00' / 949.80' S= 0.0067 '/' Cc= 0.900
<br />n= 0.013, Flow Area= 0.35 sf
<br />#3 Device 2 953.00'12.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads
<br />#4 Secondary 954.80'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
<br />Head (feet) 0.00 0.50
<br />Width (feet) 4.00 8.00
<br />Discarded OutFlow Max=0.01 cfs @ 12.32 hrs HW=953.18' (Free Discharge)
<br />1=Exfiltration (Exfiltration Controls 0.01 cfs)
<br />Primary OutFlow Max=0.82 cfs @ 12.32 hrs HW=953.18' TW=0.00' (Dynamic Tailwater)
<br />2=Culvert (Passes 0.82 cfs of 2.62 cfs potential flow)
<br />3=Orifice/Grate (Weir Controls 0.82 cfs @ 1.41 fps)
<br />Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=952.00' TW=0.00' (Dynamic Tailwater)
<br />4=Custom Weir/Orifice ( Controls 0.00 cfs)
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