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WSP05149
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Last modified
1/26/2010 2:17:10 PM
Creation date
10/12/2006 12:53:12 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8180.800
Description
Purgatoire River Project
Basin
Arkansas
Water Division
2
Date
9/1/1949
Author
RJ Tipton
Title
Engineering Report on Flood Control and Irrigation District with Particular Reference to the Piedmont Bridge Dam and Reservoir Site
Water Supply Pro - Doc Type
Report/Study
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<br />o <br />en sediment would be required for the regulation of irrigat10n <br />01 <br />1\:' water. The average capacity usable for both flood control and <br /> <br />irrigation during a 50-year period would total 66,250 acre-feet. <br /> <br />It is assumed therefore that 58.49 percent of that capacity, or <br /> <br />38,750 acre-feet, should be allocated to irrigation and 41.41 <br /> <br />percent, or 27,500 acre-feet, to flood control. <br /> <br />" <br /> <br />Siltation. The Corps of Engineers estimated that an average <br />of 980 acre-feet of sediment per year would be deposited in the <br />81,500 acre-feet retention reservoir, or a total of 49,000 acre- <br />feet over a 50-year period. This quantity was determined from. <br />the sediment contained in samples taken from the river at the <br />Trinidad gaging station. The computed "measured sediment" load <br />for a 50-year periOd was 618.12 acre-feet per year. In convert- <br />ing to acre-feet the weight of the sediment was assumed to be <br />75.7 pounds per cubic foot. In addition to the measured load, an <br />allowance of 6l8.12 acre-feet was luade for the unmeasured load, <br /> <br />:~~. <br /> <br />< <br /> <br />commonly referred to as the bed load. Thus, the total estimated <br /> <br /> <br />average annual sediment load of the river at Trinidad was 1236.24 <br /> <br /> <br />acre-feet. This was reduced by 12 percent to correct for the <br /> <br />~ <br /> <br />intervening drainage area between Trinidad and the dam site. <br /> <br />The estimated sediment load at the dam site was reduced by 10 <br /> <br />percent to allow for deposition of part of the bed load above <br /> <br />.. <br /> <br />the reservoir and for suspended sediment passing through the <br />reservoir, giving an average of 980 acre-feet per year. <br />The siltation rate used in the current studies was 610 acre- <br /> <br />feet per year. Since it was constructed, the Cucharas Reservoir, <br /> <br />located on the CucharBs River about 13 miles northeast of <br />Walsenburg, has silted at a rate of 0.93 acre-feet per square <br /> <br />-11- <br />
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