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. . tribu~2~ies of the Cache la poudre River or may include other mainste~ or tributary facilities not previously considered. Engineeri~g and planning judgement will be exercised in order to insure that only reasonable alternative facilities will be con- sidered. Available hydrologic data, and data on the present and projected water uses and a~sociated storage and diversion rights will also be compiled to be used in the water use studies and projections, and will be u~ed as input into the HODSIN model. Possibilities of intra-basin transfers and exchanges will be examined. Available economic data will be compiled for use in establishing economic criteria. These criteria will be used in a preliminary economic evaluation for screening alternative pro- jects, and will be used to establish the economic factors re- quired as input into the J.10DSIi1 model. , , PHASE III: PRELIXlINARY PLAN FORHULATION This phase of the studY will begin with the tasks of eval- uation of geological and hydrological characteristics pertinent to the existing and proposed facilities. The suitability of existing data for use in the ensuing studies will be reviewed and evaluated. Any general geological information that is available for the potential facilities or that can be correlated to the poten- tial facilities sites will be evaluated. Potential sites will be visited in order to obse~e the surface geological conditions, and to correlate them with existing information. This evaluation will be necessary in order to judge whether the foundation con- ditions are adequate for potential facilities, to judge possible seepage rates and sedimentation rates, and as a guide in deter- mining preliminary costs of the facilities. Existing hydrologic data and studies will be reviewed and evaluated in order to determine whether these studies'have ade- quately considered the resources. If necessary, streamflows at specific points in the basin will be synthesized and flood hydro- I i , I, II~3