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<br /> <br />C) <br />'J <br />~.... <br />(.;) <br />m <br />~ <br /> <br />control of irrigation sources is placed on improved irrigation <br />management through an Irrigation Management Service (IMS) and improved <br />control of waterflow in canals, laterals and drainage systems through <br />a System Improvements (SI) program. BaSically, the IMS program is a <br />non structural management technique for increasing irrigation water <br />efficiency and reducing salt loading. <br /> <br />Major benefits derived from IMS irrigation scheduling, include <br />increased yields, water savings, reduced leaching of soils, and <br />reduced drainage requirements. <br /> <br />The SI program, on the other hand, involves a structural water manage- <br />ment tool for improving water delivery conveyances and thus reducing <br />drainage and seepage salinity pickup. The lining of canals and <br />laterals, as well as field drainage systems would result in decreased <br />losses and percolation, reducing water contact with highly saline <br />soils, shales and ground water aquifers..." ~_.. - - .,.~. <br /> <br />For efficient salinity control, particularly to.meet a wide range of <br />local conditions, both the IMS and SI programs must be considered <br />under an integrated program. At present, based on available data, <br />it is difficult to separate the relative effects of each program. <br />Consequently, both schemes are considered as operating together for <br />field evaluation and feasibility studies. <br /> <br />Point sources under continuing investigatin include Littlefield <br />Springs, Glenwood-Dotsero Springs and LaVerin Springs. <br /> <br />The Littlefield Springs discharge along the south side <br />River about a mile upstream from Littlefield, Arizona. <br />have a combined outflow of about 10 cfs and contribute <br />tons of dissolved solids to the river system annually. <br /> <br />of the Virgin <br />These springs <br />about 30,000 <br /> <br />The control of these springs presents a special problem because the <br />flow is presently diverted and used for irrigation in the Littlefield <br />area. <br /> <br />The Glenwood-Dotsero group of 18 springs discharge to the Colorado <br />River at opposite ends of Glenwood Canyon in northwester Colorado. <br />These springs are estimated to contribute 25,000 acre-feet of water <br />and 500,000 tons of salt to the river annually. <br /> <br /> <br />After considering alternative methods, the geology involved, the <br />present commercial resort uses or water, and the potential loss of <br />water, it has been concluded that some type of desalting will <br />provide the most desirable solution. <br /> <br />5 <br />