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2015-01-30_PERMIT FILE - C1996083A (17)
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2015-01-30_PERMIT FILE - C1996083A (17)
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Last modified
8/24/2016 5:57:02 PM
Creation date
7/13/2015 9:54:19 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1996083A
IBM Index Class Name
Permit File
Doc Date
1/30/2015
Doc Name
Appendix A through Appendix C
Section_Exhibit Name
Volume IX Coal Mine Waste Disposal Area No. 2
Media Type
D
Archive
Yes
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S Ril[ Tway Pond F <br />Determine flow characteristics down 10.3% Grade <br />Pond F Emergency Spillway <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />Depth <br />D <br />0.78 <br />Feet <br />Width <br />W <br />5 <br />Feet <br />Slope <br />S <br />0.103 <br />Express as Decimal <br />Mannings "N" <br />N <br />0.04 <br />Express as Decimal <br />Side Slope <br />X <br />2 <br />Slope = X:1 <br />AREA=(W*D)+(X*D"2)= <br />WETTED PERIMETER=(W)+2*[((X*D)"2+D^2)^0.5] <br />R=AREA/WETTED PERIMETER <br />V=(1.49/N)*(R^.667)*(S^.5)= <br />Q=AXV= <br />Q REQUIRED - Peak Discharge <br />Sediment Pond F <br />Riprap Sizing - Down Face of Embankment - Pond F <br />D50 = Size of Riprap <br />D50 = ((V X S^.17)/7.58))^2 <br />D50 = Diameter in feet <br />V = Velocity <br />S = Slope <br />D50 = 0.58 feet <br />5.12 FEET ^2 <br />8.49 FEET <br />0.60 <br />8.53 FT/SEC <br />43.65 CFS <br />42.89 CFS <br />7 inches Use 6" to 18" Rock <br />TR -98 App. B-8 04/15 <br />
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