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PERMFILE138126
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PERMFILE138126
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Entry Properties
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 B <br />COLLECTION DITCH CDB-1 <br />FLOW IN A TRIANGULAR CHANNEL <br />ENTER DEPTH D 0.910 FEET <br />ENTER SLOPE S 0.005 EXPRESS AS DECIMAL <br />ENTER "N" N 0.030 EXPRESS AS DECIMAL <br />ENTER SIDE SLOPE X 3.000 SLOPE = X:1 <br />AREA=IW*D)+(X*D"2)= 2.48 FEET"2 <br />WETTED PERIMETER=(W)+2((XD"2+D"2))".5 5.76 FEET <br />R=AREA/WETTED PERMITER 0.43 <br />V=(1.49/N)*(R".667)*(S".5)= 2.01 FEET/SEC <br />Q = A X V = 4.98 CFS <br />Q REQUIRED 4.85 <br />Collection Ditch CDB-1 will be a triangular channel 0.91 <br />feet deep with 3h:ly side slopes. With a freeboard of 0.3' <br />the total depth fo collection ditch CDB-1 is 1.210 feet. <br />The flow velocity is slow enough that erosion will not be a <br />~ problem. <br />COLLECTION DITCH CDB-1 <br />ALTERNATE SIZE DESIGN <br />FLOW IN A TRIANGULAR CHANNEL <br />ENTER DEPTH D 1.200 FEET <br />fiNTER SLOPE S 0.020 EXPRESS AS DECIMAL <br />ENTER "N" N 0.030 EXPRESS AS DECIMAL <br />ENTER SIDE SLOPE X 1.500 SLOPE = X:1 <br />AREA=(W*D)+(X*D"2)= 2.16 FEET"2 <br />WETTED PERIMETER=(W)+2((XD"2+D"2))".5 4.33 FEET <br />R=AREA/WETTED PERMITER 0.50 <br />V=(1.49/N)*(R".667)*(3".5)= 4.42 FEET/SEC <br />Q = A X V = 9.55 CFS <br />Q REQUIRED 4.85 <br />Collection Ditch CDB-1 will be a triangular channel 1.20 <br />feet deep with 1.5h:1v side slopes. With a freeboard of 0.3' <br />the total depth of collection ditch CDB-1 is 1.500 feet. <br />The flow velocity is slow enough that erosion will not be a <br />~ problem. <br />9-9 <br /> <br />July 1991 <br />9-10 <br />
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