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

• COLLECTION DITCH CDA-2
FLOW IN A TRIANGULAR CHANNEL
ENTER DEPTH D 0.950 FEET
ENTER SLOPE S 0.005 EXPRESS AS DECIMAL
ENTER "N" N 0.030 EXPRESS AS DECIMAL
ENTER SIDE SLOPE X 3.000 SLOPE = X:1
AREA=(W*D)+(X*D"2)= 2.71 FEET"2
WETTED PERIMETER=IW)+2((XD"2+D"2))".5 6.01 FEET
R=AREA/WETTED PERMITER 0.45
V=11.49/N)*(R".667)*(S".5)= 2.06 FEET/SEC
Q = A X V = 5.59 CFS
Q REQUIRED 5.45
Collection Ditch CDA-2 will be a triangular channel 0.950
feet deep with 3h:ly side slopes. With a freeboard of 0.3'
the total depth of collection ditch CDA-2 is 1.250 feet.
The flow velocity is slow enough that erosion will not be a
problem.
• COLLECTION DITCH CDA-2
ALTERNATE SIZE DESIGN
FLOW IN A TRIANGULAR CHANNEL
ENTER DEPTH D 1.000 FEET
ENTER SLOPE S 0.020 EXPRESS AS DECIMAL
ENTER "N" N 0.030 EXPRESS AS DECIMAL
ENTER SIDE SLOPE X 1.500 SLOPE = X:1
AREA=(W*D)+(X*D"2)= 1.50 FEET"2
WETTED PERIMETER=(W)+2((XD"2+D"2))".5 3.61 FEET
R=AREA/WETTED PERMITER 0.42
V=(1.49/N)*(R".667)*(S".5)= 3.91 FEET/SEC
Q = A X V = 5.87 CF9
Q REQUIRED 5.45
Collection Ditch CDA-2 will be a triangular channel 1.000
feet deep with 1.5h:1v side slopes. With a freeboard of 0.3'
the total depth of collection ditch CDA-2 is 1.300 feet.
The flow velocity is slow enough that erosion will not be a
problem.
•
9-5 July 1991