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<br />About two-thirds of the average annual salt load flowing from Moapa <br />Valley is due to natural causes. Other factors which increase salinity <br />are evaporation from stream surfaces, erosion, consumptive use by plants, <br />and movement of water through strata containing soluable salts: saline <br />soils (Figures 8, 9A-C) and underlying geologic formations (Figures 4A, <br />48, 5) with high salt content. Salts are only added to the river system <br />by irrigation drainage waters when more saline waters or readily soluble <br />salts are present in the flow path. <br /> <br />Uncoln Co. <br />!'IarrEO:" - - - -1_ <br /> <br />) <br />I <br />'11. <br /> <br /> <br />--r---y- -r <br />/' I <br /> <br />N <br /> <br />'" <br />~ <br />.d" <br />~ ~ <br />~ .; <br />/' <br /> <br />o <br />SCALE <br /> <br />5 MILES <br /> <br />LEGEND <br /> <br />~ Saline <br />C=:J Non-Saline <br /> <br />"""""" Hydrologfc Boundary <br /> <br />Note: Sources could be combination <br />of geology, sofls and water <br /> <br />Figure 8 <br />SALINE SOILS <br /> <br />USDA-SCS <br /> <br />25 <br /> <br />Moapa Valley Subevaluatfon Unit, tlevadl <br />of the Virgin River Unit <br />Colorado River Basin Salinity Control Progrlm <br />0027J5 <br />