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WSP05094
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Last modified
1/26/2010 2:16:55 PM
Creation date
10/12/2006 12:51:40 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
2/1/1988
Title
U.S.D.A. Selected Plan - Big Sandy River Unit
Water Supply Pro - Doc Type
Definite Plan Report
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<br />Diffused Area Watershed Management <br /> <br />The evaluation indicates that contribution of salt to the Colorado River <br />system by the rangeland areas above the irrigated cropland is generally <br />low. Since only minimal salinity reduction benefits from improving <br />range areas could be expected, no treatment measures have been proposed <br />for this area. <br /> <br />Climate <br /> <br />The climate of the Eden-Farson area is classified as semiarid. The <br />essential feature of a semiarid climate is that the potential evaporation <br />from the soil surface and the vegetation exceeds the average annual <br />precipitation. <br /> <br />Precipitation ranges from 40 inches or more annually on the Wind River <br />Mountain Range to about 7 inches annually for the irrigated area in Eden <br />Valley. Due to low annual precipitation in the farmland area, irrigation <br />is essential. Peak precipitation months are April, May, and June. The <br />average monthly precipitation at Farson varies form 0.32 to 0.96 inches. <br /> <br />While snowfall may occur as early as September and as late as July, the <br />common period of snowfall is from October to May. Rock Springs, located <br />40 miles south of Farson, averages 44.6 inches of snow annually. although <br />snowfall in excess of 80 inches has been recorded. The snow cover <br />generally remains on the ground during the winter months, <br /> <br />The high altitude and relative low humidity cause considerable variance <br />in temperatures. The mean annual temperature is 370F with a recorded <br />extreme range of _ssoF to 9soF. Freezing temperatures have occurred in <br />every month of the year. There is only a fifty-fifty chance that the <br />growing season will be as long as 85 days (assuming 280F threshold <br />temperature). <br /> <br />Geology <br /> <br />The plateaus and mountains in the Colorado River Basin are the product <br />of a series of uplifted land masses deeply eroded by wind and water. <br />However, long before the earth movements which created the uplifted land <br />masses, the region was the scene of alternate encroachment and retreat <br />of great inland seas. The sedimentary rock formations underlying large <br />portions of the basin are the result of material accumulated at the <br />bottom of these seas. <br /> <br />By the early part of the Tertiary Period, southwestern Wyoming had been <br />uplifted, and warping and faulting of the crust was beginning to build <br />mountains. The Green River Basin was formed at that time. <br /> <br />The rocks of the Green River Basin are a succession of fluvial (Wasatch <br />and Bridger Formations) and lacustrine (Green River Formation) <br />sediments. Erosion of the surrounding uplands resulted in thick <br />deposits in the extensive alluvial plain and the lake, known as Lake <br /> <br />0Jl1~a <br /> <br />2-10 <br /> <br />'." <br />~~J <br />....,// <br /> <br />-~~~ <br />~: <br />t.lliJ <br /> <br />:>ii <br /> <br />~ <br /> <br />~~ <br /> <br />.~ ' <br /> <br />-",j <br /> <br />'C;' <br /> <br />./; <br /> <br />. ") <br /> <br />?~ <br />~ <br />frj,J <br />
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