2001-12-11_PERMIT FILE - C1991078

• Permit No: C1991078
• 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: No

• Sediment Pond A
POND A EMERGENCY SPILLWAY
MANNING'S EQUATION
FLOW IN A TRAPEZOIDAL CHANNEL
ENTER DEPTH D 0.830
ENTER WIDTH W 6.000
ENTER SLOPE S 0.020
ENTER "N" N 0.040
ENTER SIDE SLOPE X 2.000
AREA=(W*D)+(X*D"2)=
WETTED PERIMETER=IW)+2((XD "2+D"2))".5
R=AREA/WETTED PERMITER
V=(1.49/N)*(R".667)*(S".5)=
Q = A X V =
Q REQUIRED
RIPRAP SIZING
• D50
D50
D50
V
S
FEET
FEET
EXPRESS AS DECIMAL
EXPRESS AS DECIMAL
SLOPE = X:1
6.36 FEET"2
9.71 FEET
0.65
3.97 FT/SEC
25.25 CFS
25.07 CFS
Spillway Channel Across Top of Embankment
Size of Riprap
((V X S".17)/7.58))"2
Diameter in feet
Velocity
Slope
D50 = 0.073 feet 0.871 inches
DETERMINE VELOCITY OF FLOW DOWN 5:1 EMBANKMENT
ENTER DEPTH D 0.430 FEET
ENTER WIDTH W 6.000 FEET
ENTER SLOPE 5:1 S 0.200 EXPRESS AS DECIMAL
ENTER "N" N 0.040 EXPRESS AS DECIMAL
ENTER SIDE SLOPE X 2.000 SLOPE = X:1
AREA=(W*DI+(X*D"2)= 2.95 FEET"2
WETTED PERIMETER=(W)+2((XD"2 +D"2))".5 7.92 FEET
R=AREA/WETTED PERMITER 0.37
V=(1.49/N)*(R".667)*(S".5)= 8.62 FT/SEC
Q = A X V = 25.43 CFS
• Q REQUIRED 25.07 CFS
9-3