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<br />APPENDIX B <br /> <br />USE OF EVALUATION FACTORS FOR PLANNING STUDIES <br /> <br />A. Introduction <br /> <br />After alternatives have been developed, they must be evaluated to distinguish the <br />differences between them. The number of evaluation factors used and the extent of the analyses <br />w:ill vary with the scope of the study. In general, feasibility studies will require more detailed <br />evaluations than reconnaissance studies. The type of evaluations to be performed for each study <br />should be developed in consultation with the CWCB staff. <br /> <br />B. Evaluation Factors <br /> <br />Six evaluation factors are suggested for use in studies funded by the CWCB. They are: <br />(1) Description of project outputs or yields; (2) Project costs including capital costs, operation <br />and maintenance costs, total annual costs and cost per unit of output; (3) Impacts on the <br />man-made environment, the natural environment, and the existing social structure; (4) The <br />financial feasibility of the proposed project as measured by the project sponsor's ability to repay <br />all reimbursable costs; (5) Institutional requirements for project implementation; and (6) Any <br />special technical problems which should be taken into consideration. Each of these evaluation <br />factors is discussed in the following paragraphs. <br /> <br />1. Project Outputs <br /> <br />The expected output of each alternative under investigation should be described, insofar <br />as possible, in quantitative terms. For most projects funded by the CWCB, the outputs <br />will be expressed in terms of acre-feet of water supply or in units of energy for <br />hydropower. <br /> <br />For municipal water supply projects, the estimated safe annual yield of the project should <br />be given. The safe annual yield is the amount of water the project is expected to yield <br />during each year of a critical dry period. The criteria and methodology used for the safe <br />yield estimate should be provided in the study report. <br /> <br />For irrigation projects, the yield of the project should be expressed in terms of acre-feet <br />of water supplied to the project service area on an annual basis. The degree of reliability <br />or fIrmness of supply associated with a particular yield should also be given. For <br />example, the analysis might indicate a project yield of 20,000 acre-feet per year with a <br />reliability of 90 percent or a yield of 22,000 acre-feet per year with a reliability of 85 <br />percent. <br /> <br />For new irrigation projects, or for expansion of existing projects, the incremental increase <br /> <br />B-1 <br />