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<br />the Grand Valley has shown that the most significant progress <br />is made when the gamut of questions can be answered regarding <br />~ the interrelationships between water management and agricultural <br />o production. The concept of a technology package, along with an <br />~ understanding of the "system" including other agricultural <br />c) inputs, provides the necessary base for providing sound advice <br />to the farmer. This, in turn, facilitates the development of <br />credibility and, consequently, farmer acceptance. <br /> <br />A two-day "Field Days" was conducted during the third year <br />of this project in the month of August. This event was primarily <br />directed towards the growers in the Grand Valley and secondly <br />to irrigation leaders (mostly growers) throughout the Upper <br />Colorado River Basin. State and Federal agency personnel also <br />attended. This was coupled with an irrigation equipment show <br />and was cosponsored by the Colorado State University Cooperative <br />Extension Service. <br /> <br />The concurrent EPA research project, "Irrigation Practices, <br />Return Flow Salinity, and Crop Yields," which was also conducted <br />in the Grand Valley, provided necessary input for developing the <br />cost-effectiveness of each salinity control measure. The results <br />from that project provided valuable information regarding <br />increased crop yields that can be expected from improved water <br />management practices. The combined results of these two projects <br />are extremely important in establishing the benefits to be <br />derived from implementing a salinity control technology package. <br />The detailed results of this project can be found in the EPA <br />reports entitled, "Potential Effects of Irrigation Practices on <br />Crop Yields in Grand Valley" and "Irrigation Practices and Return <br />Flow Salinity in Grand Valley." The combined results of the two <br />projects are incorporated in the EPA report "Best Management <br />Practices for Salinity Control in Gr.and Valley." <br /> <br />As a part of the demonstration project, the effects of <br />various institutional influences upon salinity control were <br />analyzed. These included the effects of tailwater runoff con- <br />trol, the requirements for implementing a permit system, and the <br />alternative of setting "influent" standards. The information <br />necessary for analyzing the effects of each of the above alter- <br />natives was collected as a part of the demonstration project. <br />To allow the analysis to be projected valley-wide, some field <br />data were collected on a random sample basis throughout the <br />Valley. <br /> <br />Although not all of the institutional alternatives for <br />implementing salinity control technology were thoroughly <br />analyzed under this demonstration project, every attempt was <br />made to collect the necessary "field" data for assessing the <br />constructed alternatives. Thus, any remaining alternatives must <br />be analyzed on a much larger scale (i.e., regional, state, or <br />federal). Even though each irrigated area is somewhat different, <br /> <br />l2 <br />