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Mineral Joe 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 cfs @ <br />21.99 hrs, Volume= <br />0.053 af, Atten= 99 %, Lag= 597.7 min <br />Primary = <br />0.19 cfs @ <br />21.99 hrs, Volume= <br />0.053 of <br />Routing by Stor -Ind method, Time Span= 1.00 -30.00 hrs, dt= 0.05 hrs <br />Peak Elev= 5,872.53'@ <br />21.99 hrs Surf.Area= 0 sf Storage= <br />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 Invert Avail.Storage Storage Description <br />#1 5,864.50' 42,066 cf Custom Stage Data (Irregular) Listed below (Recalc) - Impervious <br />Elevation <br />Surf.Area <br />Perim. Inc.Store <br />Cum.Store <br />Wet.Area <br />(feet) <br />(sq -ft) <br />(feet) (cubic -feet) <br />(cubic -feet) <br />(sq -ft) <br />5,864.50 <br />329 <br />77.5 0 <br />0 <br />329 <br />5,865.00 <br />837 <br />137.5 282 <br />282 <br />1,357 <br />5,865.50 <br />1,222 <br />182.8 512 <br />794 <br />2,514 <br />5,866.00 <br />1,652 <br />234.9 716 <br />1,509 <br />4,249 <br />5,866.50 <br />2,242 <br />323.8 970 <br />2,479 <br />8,204 <br />5,867.00 <br />2,585 <br />334.8 1,206 <br />3,685 <br />8,804 <br />5,867.50 <br />2,953 <br />346.7 1,383 <br />5,068 <br />9,471 <br />5,868.00 <br />3,310 <br />358.4 1,565 <br />6,633 <br />10,151 <br />5,868.60 <br />3,663 <br />371.6 2,091 <br />8,724 <br />10,948 <br />5,869.00 <br />4,218 <br />452.2 1,575 <br />10,299 <br />16,235 <br />5,869.50 <br />4,635 <br />467.0 2,212 <br />12,512 <br />17,342 <br />5,870.00 <br />5,049 <br />477.4 2,420 <br />14,932 <br />18,158 <br />5,870.50 <br />5,468 <br />487.9 2,629 <br />17,560 <br />19,000 <br />5,871.00 <br />5,889 <br />498.5 2,839 <br />20,399 <br />19,868 <br />5,871.50 <br />6,318 <br />508.7 3,051 <br />23,450 <br />20,723 <br />5,872.00 <br />6,756 <br />518.8 3,268 <br />26,718 <br />21,588 <br />5,872.50 <br />7,304 <br />546.0 3,514 <br />30,232 <br />23,908 <br />5,873.00 <br />7,727 <br />560.0 3,757 <br />33,989 <br />25,171 <br />5,873.50 <br />8,194 <br />589.3 3,980 <br />37,969 <br />27,866 <br />5,874.00 <br />8,194 <br />589.3 4,097 <br />42,066 <br />28,161 <br />Device Routing <br />Invert Outlet Devices <br />#1 Primary <br />5,872.50' 10.0' long x 14.0' breadth Broad - Crested Rectangular Weir <br />Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 <br />1.40 1.60 <br />Coef. (English) 2.64 2.67 <br />2.70 2.65 2.64 2.65 <br />2.65 2.63 <br />Primary OutFlow <br />Max =0.11 cfs @ 21.99 hrs HW= 5,872.53' <br />(Free Discharge) <br />L1= Broad - Crested Rectangular Weir (Weir Controls 0.11 cfs @ 0.42 fps) <br />4148B.131029 Whetstone Associates • <br />