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MSE 24-hr 3 100-Year Rainfall=7.32"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 23HydroCAD® 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 = 5.36" for 100-Year event
<br />Inflow =4.08 cfs @ 12.15 hrs, Volume=0.218 af
<br />Outflow =3.08 cfs @ 12.21 hrs, Volume=0.218 af, Atten= 24%, Lag= 3.6 min
<br />Discarded =0.01 cfs @ 12.21 hrs, Volume=0.032 af
<br />Primary =3.07 cfs @ 12.21 hrs, Volume=0.186 af
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 945.68' @ 12.21 hrs Surf.Area= 1,358 sf Storage= 1,764 cf
<br />Plug-Flow detention time= 222.3 min calculated for 0.218 af (100% of inflow)
<br />Center-of-Mass det. time= 222.5 min ( 993.9 - 771.4 )
<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 @ 12.21 hrs HW=945.68' (Free Discharge)
<br />1=Exfiltration (Exfiltration Controls 0.01 cfs)
<br />Primary OutFlow Max=3.07 cfs @ 12.21 hrs HW=945.68' TW=0.00' (Dynamic Tailwater)
<br />2=Culvert (Inlet Controls 3.07 cfs @ 8.81 fps)
<br />3=Orifice/Grate (Passes 3.07 cfs of 3.11 cfs potential flow)
<br />Summary for Pond P3i: Infiltration Basin 3
<br />Inflow Area =1.114 ac, 19.12% Impervious, Inflow Depth = 4.85" for 100-Year event
<br />Inflow =8.72 cfs @ 12.15 hrs, Volume=0.450 af
<br />Outflow =3.30 cfs @ 12.31 hrs, Volume=0.450 af, Atten= 62%, Lag= 9.8 min
<br />Discarded =0.02 cfs @ 12.31 hrs, Volume=0.052 af
<br />Primary =3.29 cfs @ 12.31 hrs, Volume=0.398 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= 954.76' @ 12.31 hrs Surf.Area= 2,825 sf Storage= 5,560 cf
<br />Plug-Flow detention time= 182.2 min calculated for 0.450 af (100% of inflow)
<br />Center-of-Mass det. time= 182.5 min ( 966.5 - 784.0 )
<br />MSE 24-hr 3 100-Year Rainfall=7.32"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 24HydroCAD® 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=0.02 cfs @ 12.31 hrs HW=954.75' (Free Discharge)
<br />1=Exfiltration (Exfiltration Controls 0.02 cfs)
<br />Primary OutFlow Max=3.29 cfs @ 12.31 hrs HW=954.75' TW=0.00' (Dynamic Tailwater)
<br />2=Culvert (Barrel Controls 3.29 cfs @ 9.41 fps)
<br />3=Orifice/Grate (Passes 3.29 cfs of 5.01 cfs potential flow)
<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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