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<br />JI""'" <br /> <br />BREAK.'iN OF TOTAL BASIN SALINITY AREA <br />Figures at each gaging station (triangles) represent quantity of salt from drainage area between that station and <br />next station upstream, <br /> <br /> <br />! <br />( <br />f <br />I <br />\ <br />\ <br />\ <br />(22% <br />L NATURAL RUNOFF <br />IRRIGATION DRAINAGE <br /> <br />20% <br />NATURAL RUNOFF <br />IRRIGATION DRAINAGE <br />COAL MINE DISCHARGE <br /> <br />8% <br />NATURAL RUNOFF <br />SPRINGS <br />I <br />I <br />'-..... <br /> <br />\ <br />,; <br /> <br />I <br />I <br />( <br /> <br />37% <br />NATURAL RUNOFF <br />SPRINGS <br />l....\ <br />\ <br />, <br />-,,,,, <br />" <br />\ <br />I <br />, <br />\ <br />) <br />/ <br />./ <br />.- <br />./ <br /> <br />\ <br /> <br />( <br />) <br />/ <br /> <br />I <br /> <br />, .- <br />L/'-/' <br /> <br />" <br />-- <br />--".r-~\ <br /> <br />f ~o/o <br />IRRIGATION DRAINAGE <br />NATURAL RUNOFF <br /> <br />Approximately 140,000 tons of salt per Year enters <br />the Colorado from the Dirty Devil. That salt comes <br />from the areas of the basin shown on the map. This <br />conclusion is based on analysis of data collected by <br />others over the past several years and measurements <br />and observations we have made since initiating this <br />study last summer, We've also gained some knowledge <br />by talking to area ranchers and other residents who <br />know about water movement and salinity in the basin. <br />To confirm and refine our estimates, we need to <br />collect more data, <br /> <br />In general, we're looking for locations where the <br />water is of sufficient volume and the salt concentrated <br />enough that control measures will be economical. <br /> <br />'-~,-/. <br /> <br />The effectiveness of a method is measured by how <br />much it will cost per unit of salt removed (expressed as <br />"$ per mg(L"), <br /> <br />Although about 61 percent of salt loading in the <br />basin results from natural surface runoff, that salt is of <br />such a low concentration or so difficult to control that <br />it has poor cost-effectiveness. Point sources on the <br />other hand, like springs and mine discharge, which <br />account for about 24 percent of the total, are more <br />cost-effective to control. Irrigation improvements can <br />be cost-effective as well. Irrigation drainage accounts <br />for about 15 percent of basin salinity, <br />002456 <br />