PERMFILE42075

• Permit No: C1981033A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 11 DRAINAGE AND SEDIMENT CONTROL PLAN
• Media Type: D
• Archive: Yes

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MINE BENCH ACCESS ROAD COLLECTION DITCH - SEGMENT 1
FLOW IN A TRIANGULAR CHANNEL
DEPTH 0.900 FEET 1. 20' W/Freeboard
SLOPE OF DITCH 0.020 EXPRESS AS DECIMAL
MANNINGS "N" 0.030 EXPRESS AS DECIMAL
SIDE SLOPE 1.500 SLOPE = X:1
AREA=(W*D)+(X*D)= 1.22 FEET^2
WETTED PERIMETER=(W)+2((XD^2+D^2))^.5 3.24 FEET
R=AREA/WETTED PERMITER 0.37
V=(1.49/N)*(R^.667)*(S^.5)= 3.65 FEET/SEC
Q = A X V = 4.43 CFS
Q REQUIRED AREAS 1, 2 4.03
MINE BENCH ACCESS ROAD COLLECTION DITCH - SEGMENT 2
•
•
FLOW IN A TRIANGULAR CHANNEL
DEPTH 0.900 FEET 1.20' W/Freeboard
SLOPE OF DITCH 0.100 EXPRESS AS DECIMAL
MANNINGS "N" 0.030 EXPRESS AS DECIMAL
SIDE SLOPE 1.500 SLOPE = X:1
AREA=(W*D)+(X*D)=
WETTED PERIMETER=(W)+2((XD^2+D^2))^.5
R=AREA/WETTED PERMITER
V=(1.49/N)*(R^.667)*(S^.5)=
Q = A X V =
Q REQUIRED AREAS 1, 2, 3, 4
RUNOFF3.WK3
11-7
1.22 FEET^2
3.24 FEET
0.37
8.16 FEET/SEC
9.91 CFS
7.91
Rev. 02-15-94