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WSP04272
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Last modified
1/26/2010 12:54:37 PM
Creation date
10/12/2006 12:15:16 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
3/1/1989
Title
Planning Report Concluding the Study on Big Sandy River Unit - Wyoming
Water Supply Pro - Doc Type
Report/Study
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<br />/i~ <br /> <br />CHAPTER I <br /> <br />INTRODUCTION <br /> <br />improvements. Early in the process of selecting the salinity <br />units to be studied, the Big Sandy River Unit was identified as a <br />possible irrigation source of salt loading. <br /> <br />~., <br /> <br />A Memorandum of Agreement, effective March 27, 1975, was entered <br />into by the Soil Conservation Service (SCS) and Reclamation to <br />implement the specific cooperative activities called for under <br />Title II of Public Law 93-320. <br /> <br />,. \ <br /> <br />The SCS objectives were to determine the contribution of salt <br />loading from the irrigated areas of the Eden Project to the Big <br />Sandy River and to determine on-farm opportunities for reducing <br />it. The SCS established an interdisciplinary study team in 1977 <br />that developed alternative solutions including sprinkler and <br />border irrigation, land retirement, and mandatory reduced water <br />deliverie~. The SCS has completed its study and is awaiting <br />completion of the Reclamation study. <br /> <br />~.. ~ <br /> <br />Further information on the SCS study is available in the report <br />entitled Big Sandy River, Colorado River Basin Salinity Control <br />Study, Final Report, U.S. Department of Agriculture, Soil <br />Conservation Service, Casper, Wyoming, November 1980. As a <br />supplement to this report, the SCS conducted an alternative study <br />on low-pressure sprinklers. A draft report on the study, Big <br />Sandy River Unit Salinity Study-Selected Plan, was released in <br />January 1986 and the Final Environmental Impact Statement for the <br />Big Sandy River Unit, Sublette and Sweetwater Counties, Wyoming, <br />was released in September 1987. <br /> <br />Previous Reclamation Studies <br /> <br />~h; <br /> <br />Reclamation began studying the salt-loading mechanisms along the <br />Big Sandy River in 1972. Early investigations included <br />establishing a network of water quality sampling stations along <br />the main stem of the river and its tributaries. A contract was <br />awarded to the University of Wyoming to investigate the <br />possibility of desalting the saline water by atmospheric <br />freezing. Later, a contract was awarded to drill a deep test <br />well into the underlying freshwater aquifer to determine if <br />reducing the high pressure in that aquifer, which was believed to <br />be causing water to flow upward through the shale formations, <br />would stop the flow in the seeps. This was unsuccessful, and <br />further drilling showed that the water emerging from the seeps <br />was moving downslope through shallow aquifers usually less than <br />300 feet deep. A grid of 98 test wells had been drilled into the <br />shallow aquifers by 1978 and pump tested by 1980. <br /> <br />1'.' <br /> <br />6 <br /> <br />l"., 11 r .' , <br />i", 4. .-.;,11 <br /> <br />:'l" <br />",-\, <br />~. <br />
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