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<br />A. INTRODUCTION <br /> <br />The McElmo Creek is a tributary to the San Juan River which is <br /> <br />a tributary to the Colorado River. For planning purposes the <br /> <br /> <br />McElmo Creek unit has been divided into four priority areas. <br /> <br />Public Law 93-320, as amended, requires USDA to monitor on- <br /> <br />farm salinity control activities and to evaluate program <br /> <br />effectiveness for reducing salt load contributions to the Colorado <br /> <br />River. Additionally, USDA recognized the importance of evaluating <br />project impacts on wetlands and other wildlife values and assessing <br />local economic effects of project implementation. The McElmo Creek <br /> <br />Monitoring & Evaluation Program has been set up to carry out the <br /> <br />monitoring process in Montezuma County. <br /> <br />B, GOALS AND OBJECTIVES: <br /> <br />The objective of the hydro-salinity monitoring and evaluation <br /> <br />program for the McElmo Creek unit of the CRSC program as it is <br />currently outlined in the M&E plan is to "Assess the effectiveness <br />of USDA project actions for reducing the salt load in McElmo Creek. <br /> <br />Because salt load reduction is not directly measurable it <br /> <br />becomes necessary to evaluate reduction in deep percolation during <br /> <br />field irrigation and to evaluate reduction in seepage from existing <br /> <br />earth ditches replaced by pipeline or ditch lining. Therefore, <br /> <br />these evaluations are needed in order to achieve the objective. <br /> <br />-1'1 r"'o <br />l'~1 J.. ,J t) <br />