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, . . i. A discussion of the use of hydrologic models is presented later in this section. TUdor plans to use the MODSIH model developed by the Colorado Water Resources Research Institute (CWRRI) in the preliminary plan formulation phase. Tudor has explored the possibility of using the services of the CWRRI and has made tentative arrangements to enter into an agreement with them to assist in use of the model. It is anticipated that one of the operation simulation models developed by the u.s. Corps of Engineers' Hydrologic Engineering Center will be used in the reconnaissance plan formulation phase. During the reconnaissance plan formulation phase Tudor plans to use economic impact models to estimate output of the project. Tudor recognizes, however, that use of the automatic computer capability does not eliminate the need for experienced engineering and planning judgement. Maximum use will be made of Tudor's expertise and experience developed in accomplishing investigations of similar scope and complexity to make the computer capability more meaningful. Throughout the study, Tudor proposes to use methodologies and techniques that are technically sound and accepted by the engineering and planning professions. Tudor recognizes that close coordination with the Colorado Water Conservation Board (CWCB) must be maintained throughout the study to gain input from the involved public and state agencies. i, PHASE I: PRELIMINARY TASKS During Phase I of the study all existing data and information relevant to the development and beneficial use of the development of the surface water resources of the Cache la Poudre Basin will be collected and reviewed. The data will be reviewed in order to identify what data are pertinent to the study in their present form, which data must be modified and upgraded, and where data gaps ,exist. Additional efforts will be made to update existing data and fill in data gaps. A detailed management plan will be prepared as part of this phase. I-2