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WSP06290
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Last modified
1/26/2010 2:22:05 PM
Creation date
10/12/2006 1:32:37 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8277.600.10
Description
Big Sandy River Unit - Colorado River Salinity Control Program
State
WY
Basin
Colorado Mainstem
Date
5/1/1986
Title
U.S.D.A. Selected Plan - Big Sandy River
Water Supply Pro - Doc Type
Definite Plan Report
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<br />I <br /> <br />I <br /> <br />The alternative of placing the entire canal system in pipeline for <br />low pressure sprinkler irrigation proved to be very costly with a total <br />installation cost of near $70 million. Although this alternative showed <br />benefits exceeding costs, the project would have been very marginal and <br />again showed that the operations, maintenance, and replacement costs <br />could not be paid for from landowner increased agricultural production. <br />Therefore, this alternative is not considered viable. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />In 1984, the Soil Conservation Service evaluated the low pressure <br />sprinkler irrigation project (individual on-farm pumping stations). In <br />addition, an economic evaluation was made to update landowner benefits <br />that would result from a sprinkler irrigation system. This evaluation <br />was presented to the State of Wyoming in November 1984. The Eden Valley <br />Irrigation and Drainage District held a public meeting December 17, <br />1984, at which time the low pressure sprinkler alternative was <br />presented. Consensus from both meetings was that both the State of <br />Wyoming and local landowners would support the low pressure sprinkler <br />alternative, The Soil Conservation Service was asked to prepare a USDA <br />selected on-farm low pressure sprinkler alternative. Letters from the <br />State of Wyoming and Big Sandy Conservation District are shown in the <br />appendix. As a result of these requests, the USDA selected salinity <br />control plan that is presented in this report will be a low pressure <br />on-farm sprinkler irrigation plan with a total project cost of <br />approximately $17 million. Although sprinkler irrigation is the primary <br />component of this alternative, other irrigation water management <br />practices will be cost shared at the same rate as the sprinkler <br />systems. The cost share as set up in the report will be 30 percent <br />local and 70 percent Federal for those qualifying conservation <br />practices. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Projects and Programs of Other Agencies <br /> <br />I <br /> <br />The Bureau of Reclamation is also conducting preliminary <br />investigations for salinity reduction for the Big Sandy River Unit. <br />Their work has consisted of identifying the saline aquifers that <br />contribute the bulk of the salt load to the Big Sandy River and <br />determining the mechanisms by which these aquifers are recharged. The <br />potential of intercepting these aquifers and use of the saline waters <br />for industrial purposes prior to their discharge into the Big Sandy <br />River has been examined and an experiment in desalting by natural <br />freezing was conducted. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />The Bureau of Reclamation drilled a total of 92 test wells between <br />1975 and 1978 to locate and characterize the various saline aquifers. <br />These holes range in depth from 30 to 300 feet and cover an area that <br />extends from the Big Sandy Reservoir to the Gasson Bridge on the Big <br />Sandy River, which is a distance of about 25 miles. These wells are <br />being monitored for water level and quality. All the test wells have <br />been pump tested to determine the extent and transmissibility of the <br />aquifer. <br /> <br />I <br /> <br />I <br /> <br />Eighteen of the test wells were drilled near the Big Sandy <br />Reservoir. It appears that the reservoir does not contribute <br />significantly to the salinity problem. <br /> <br />( \".-, <br />(1'.)( -.IV":' <br /> <br />I <br /> <br />I <br /> <br />1-4 <br />
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