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. . known sources of data are identified. The data I'/ill be reviewed in order to determine its completeness, accuracy, and applica- bility for use in the proposed study. The need for additional data will be assessed and any additional data required will be collected or generated. PHASE II: IllVENTORY OF RESOURCES AND NEEDS The major tasks during this phase of the study "rill include an inventory and evaluation of existing and potential facilities and the compilation of hyd~ologic, water use, water rights, and economic data into a form 6uitable for input into the MODSIM program. There are more than 60 existing water storage facilities in the Cache la Poudre Basin as well as numerous diversion and carriage facilities. These will be identified, and minor ones will be evaluated in order to determine if some can be aggregated and treated as a single feature in the analyses. The major fac- ilities will be analyzed to determine their potential for improved yield by increasing the efficiency of their operation or increas- ing the efficiency of water use. Possibilities of enlarging the capacity of existing facilities, such as Horsetooth Reservoir, will be investigated, and possibilities of sediment removal to increase reservoir yield will be considered. Present and modi- fied characteristics of the facilities will be determined as necessary for input into the MODSIM model. Over the years, many alternative facilities for the develop- ment of the water resources of the Cache la poudre Basin have been identified and studied at various levels of detail. Data from these studies will be analyzed, and the characteristics of the facilities will be determined as necessary for input into the HODSI~l model. In addition to potential facilities which have been previ- ously identified and studied, it is anticipated that other pot- , ential facilities may be identified. These may include offstream storage facilities that will minimize impacts on the mainstem and II~2