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I I I I I A computer simulation model was used to perform operation studies to formulate and to evaluate alternative plans, Three alternative plans were evaluated in the study, o Alternative I - Tongue Creek only o Alternative 2 - Tongue Creek and Leroux Creek o Alternative 3 - Tongue Creek and Leroux Creek and Overland Ditch The basic assumptions used in the operation studies were: I I I I I I 1. A full supply of water is provided to the study area under varying degrees of reliability, 2. There is a high degree of cooperation among water right holders in the project area. 3, Water demands were based on minimum water requirements (ideal demand), 4. Upper basin demand would be met first to maximize the usage of return flows, Findings The consultant's role in the Grand Mesa Water Supply Project was to assess various sources and means of increasing the availability of water to existing irrigated land within the study area. The following are the major findings of the study: I o Sufficient water is available to provide a full supply to the project area if out of priority diversion in the upper basin is conducted and if a new storage reservoir is provided to assure that senior water right holders would receive water on call in accordance with their actual demands (minimum water requirements) throughout the irrigation season, I I I I I I I o Non-structural improvements alone would not significantly increase water availability in the basin, Storage facilities would be necessary to capture excess streamflows in the spring of the year. o Enlargement of existing Grand Mesa Reservoirs is not recommended because of constraints imposed by topography and the small size of the drainage areas above the reservoir. -4-