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<br />. Task IIIa-3 <br /> <br />Yampa River Basin Model Enhancement <br /> <br />Objective: The Yampa River basin model will be enhanced to include the approximately 25 percent of <br />current water use which was left "in the gage" in the Phase II model. Additional diversions and storage <br />structures will be aggregated to produce a manageable data set and to avoid significantly degrading <br />computational performance. The final model will be calibrated and documented. <br /> <br />Prerequisite: The Phase II Yampa River Basin model is documented and calibrated with <br />approximately 75 percent of the current water use modeled and with irrigation demands based on the <br />1993 GIS mapping in the calculated scenario. <br /> <br />Assumptions: - Study period is 1975 through 1991. <br />- Total irrigation consumptive use is defined as the consumptive use associated with the <br />irrigated acreage recorded in the CRDSS irrigated acreage spatial database, Structures and water rights <br />not tied to irrigated parcels will not be included in the model, but will be documented as being <br />excluded, <br /> <br />Task Leader: Meg Frantz (Boyle) <br />Task3.0l Phase II Instream Flow Revision <br /> <br />'. Objective: The objective of this task was to I) modify the Yampa River Basin Phase II model input to <br />treat instream flows as a reach rather than a series of discrete points and 2) compare model results <br />before and after the change: Based on discussions between the STATE and Boyle as part of the <br />January 31, 1997 contract amendment, activities associated with the revised instream flow reach <br />designation are described in task 3.12 while a comparison to Phase II will occur in Task 3,15, <br />Therefor, no activities are scoped in this task. This task has not been deleted in order to maintain <br />consistency in task numbering and progress reporting, <br /> <br />Approach: <br /> <br />1, None, <br /> <br />flf ,v--t. 1-0 <br /> <br />H-~~ <br /> <br />Oeliverables: <br />1. None, <br /> <br />Task 3.02 Map Preparation ( J' ~9 <br /> <br />Objective: Prepare an electronic and hard copy map of irrigated lands, headgates, hydrology, and <br />baseflow nodes, differentiating between that modeled in Phase II and remaining to be modeled in Phase <br />III. This map will be a useful aid in spatial aggregation of diversion structures. <br /> <br /> <br />Approach: <br /> <br />1163 <br /> <br />Phase IIIa Scope of Services <br /> <br />A-2! <br /> <br />Jan3!, !997 <br />