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JD -6 Mine - Drainage Design Plan 42
<br />Spillway crest
<br />Figure 20. Depth of Water above Spillway Crest
<br />Table 24. Planned Retention Pond Spillway Analysis
<br />Inflow Area = 6 734 ac, Inflow Depth = 1.33" for 100 -yr event
<br />Inflow
<br />= 12.59 cfs @
<br />12.03 hrs, Volume=
<br />0.747 of
<br />Outflow
<br />= 0.19 cis @
<br />21.99 hrs, Volume=
<br />0.053 af, Atten= 99 %,
<br />Lag= 597.7 min
<br />Primary
<br />= 0.19 cfs @
<br />21.99 hrs, Volume=
<br />0.053 of
<br />Routing by
<br />Stor -Ind method, Time Span=
<br />1.00 -30.00 hrs, dt= 0.05 hrs
<br />Peak Elev= 5,872.53'@ 21.99
<br />hrs Surf.Area= 0 sf Storage= 30,420 cf
<br />Plug -Flow detention time= 694.3 min calculated for 0.053 of (7% of inflow)
<br />Center -of -Mass det. time= 520.5 min (1,361.7 - 841.2 )
<br />Volume
<br />Invert Avail.Storage
<br />Storage Description
<br />#1
<br />5,864.50' 42,066 cf
<br />Custom Stage Data (Irregular) Listed below (Recalc) - Impervious
<br />Elevation
<br />Surf.Area
<br />Perim.
<br />Inc.Store
<br />Cum.Store
<br />Wet.Area
<br />(feet)
<br />(sq -ft)
<br />(feet)
<br />(cubic -feet)
<br />(cubic -feet)
<br />(sq -ft)
<br />5,864.50
<br />329
<br />77.5
<br />0
<br />0
<br />329
<br />5,865.00
<br />837
<br />137.5
<br />282
<br />282
<br />1,357
<br />5,865.50
<br />1,222
<br />182.8
<br />512
<br />794
<br />2,514
<br />5,866.00
<br />1,652
<br />234.9
<br />716
<br />1,509
<br />4,249
<br />5,866.50
<br />2,242
<br />323.8
<br />970
<br />2,479
<br />8,204
<br />5,867.00
<br />2,585
<br />334.8
<br />1,206
<br />3,685
<br />8,804
<br />5,867.50
<br />2,953
<br />346.7
<br />1,383
<br />5,068
<br />9,471
<br />5,868.00
<br />3,310
<br />358.4
<br />1,565
<br />6,633
<br />10,151
<br />5,868.60
<br />3,663
<br />371.6
<br />2,091
<br />8,724
<br />10,948
<br />5,869.00
<br />4,218
<br />452.2
<br />1,575
<br />10,299
<br />16,235
<br />5,869.50
<br />4,635
<br />467.0
<br />2,212
<br />12,512
<br />17,342
<br />5,870.00
<br />5,049
<br />477.4
<br />2,420
<br />14,932
<br />18,158
<br />5,870.50
<br />5,468
<br />487.9
<br />2,629
<br />17,560
<br />19,000
<br />5,871.00
<br />5,889
<br />498.5
<br />2,839
<br />20,399
<br />19,868
<br />5,87150
<br />6,318
<br />508.7
<br />3,051
<br />23,450
<br />20,723
<br />5,872.00
<br />6,756
<br />518.8
<br />3,268
<br />26,718
<br />21,588
<br />5,872.50
<br />7,304
<br />546.0
<br />3,514
<br />30,232
<br />23,908
<br />5,873.00
<br />7,727
<br />560.0
<br />3,757
<br />33,989
<br />25,171
<br />5,873.50
<br />8,194
<br />589.3
<br />3,980
<br />37,969
<br />27,866
<br />5,874.00
<br />8,194
<br />589.3
<br />4,097
<br />42,066
<br />28,161
<br />Device Routing Invert Outlet Devices
<br />#1 Primary 5,872.50' 10.0' long x 14.1Y breadth Broad - Crested Rectangular Weir
<br />Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
<br />Coef. (English) 2.64 2.67 2.70 2 65 2.64 2.65 2.65 2.63
<br />Primary OutFlow Max=0.11 cfs @ 21.99 hrs HW= 5,872.53' (Free Discharge)
<br />11= 13road - Crested Rectangular Mir (Weir Controls 0.11 cfs @ 0.42 fps)
<br />4148A.131028 Whetstone Associates
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