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<br />To be able to evaluate these alternatives ~ffectively, we established a set of <br /> <br />criteria. This criteria was derived from our conversations and meetings with <br /> <br />the stockholders of the ditch, ditch compa~ies in the region with similar prob- <br /> <br /> <br />lems, contractors who install irrigation ditches and pipes, and our own observa- <br /> <br />tions and studies of the irrigation ditche$ in the area. The following guide <br /> <br /> <br />lines were generated from the above mentioned research and will be used in the <br /> <br /> <br />evaluation of each alternative. <br /> <br />1. Ultimate life span characteristics <br />2. Operation and Maintenance Costs <br />3. Ecological Considerations <br />4. Reliability of Water Supply to User's <br />5. Benefit/Cost Analysis <br /> <br />21 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />