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<br />MAY 1982 <br /> <br />The undulating topography, ranging between 2 to 12 percent land slopes, <br /> <br />essentially precludes attaining uniform application of irrigation water <br /> <br />using surface methods of application in much of the Montezuma Valley. <br /> <br />Without uniformity of application a primary element of irrigation water <br /> <br />management is lacking. Sprinkler irrigation systems, easily operable under <br /> <br />local topographic conditions, are well suited to achieving uniform <br /> <br />distribution and other aspects of irrigation water management needed for <br /> <br />salinity control. Land slopes offer opportunity to develop gravity pressure <br /> <br />needed to effectively operate sprinklers on 10,400 acres of land; and the <br /> <br />pipelines used to carry water under pressure to the sprinklers will <br /> <br />essentially eliminate seepage from that portion of the existing water <br /> <br />delivery system. Therefore, sprinkler irrigation systems are a primary <br /> <br />element of plan formulation supplementing irrigation water management as the <br /> <br />non-structural means for salinity control. <br /> <br />Incremental units of development used in plan formulation are: <br /> <br />1. Continuation of Ongoing Programs - the no accelerated action <br /> <br />program. <br /> <br />2. Irrigation Water Management - the non-structural program. <br /> <br />3. Irrigation Water Management with limited use of sprinklers. <br /> <br />4. Irrigation Water Management and extensive use of sprinklers <br /> <br />using only gravity pressure. <br /> <br />5. Irrigation Water Management and extensive use of sprinklers <br /> <br />using gravity and pumped pressure <br /> <br />6. Ditch lining only. <br /> <br />It should be noted that there is a low likelihood of achieving the <br /> <br />indicated degree of potential salt load reduction attributed to irrigation <br /> <br />water management. Present onfarm irrigation practices, developed and <br /> <br />suited to each farmer's circumstances, experience and perference, <br /> <br />are not <br /> <br />001833 <br /> <br />likely to be changed without some incentive for doing so. <br /> <br />11-7 <br />