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PERMFILE138126
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PERMFILE138126
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Last modified
8/24/2016 10:38:44 PM
Creation date
11/26/2007 7:04:37 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1991078A
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
Exhibit 09 Protection of the Hydrologic Balance
Media Type
D
Archive
Yes
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• Sediment Pond C <br />RIPRAP SIZING - Spillway Channel Across Top of Embankment <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 = 0.072 feet 0.860 inches <br />• <br />DETERMINE VELOCITY OF FLOW DOWN 5:1 EMBANKMENT <br />ENTER DEPTH D 0.420 FEET <br />ENTER WIDTH W 6.000 FEET <br />ENTER SLOPE 5:1 S 0.200 EXPRESS AS DECIMAL <br />ENTER "N" N 0.040 EXPRESS AS DECIMAL <br />ENTER SIDE SLOPE ti 2.000 SLOPE = X:1 <br />AREA=(W*DI+(X*D"2)= <br />WETTED PERIMETER=(W)+2((XD"2+D"2))".5 <br />R=AREA/WETTED PERMITER <br />V=(1.49/N1*(R".667)*(S".5)= <br />Q = A X V = <br />Q REQUIRED <br />RIPRAP SIZING - Spillway Channel Down Face of Embankment` <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 = 0.728 feet 8.736 inches <br />2.87 FEET"2 <br />7.88 FEET <br />0.36 <br />8.50 FT/SEC <br />24.43 CFS <br />24.29 CFS <br />The spillway for sediment pond C will be a trapezoidal <br />channel 6.0 feet wide and 0.82 feet deep <br />with a freeboard of 12" for a total depth of 1.820 <br />feet. Rip rap, 6" minus, will be placed in the spillway <br />channel across the top of the embankment and riprap, <br />9" minus, will be placed in the spillway channel down <br />the face of the embankment and in the inlet channel <br />that feeds the pond. <br />I1 <br />lJ <br />9-12 <br />
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