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, OO~241 4l;.\ ' -'. CRDSS Task Order Task Order Title: Task Order Number: Consultant: Estimated Duration: Estimated Cost: Colorado River Water Resource Model Enhancements LR-2 Ross Bethel of Leonard Rice Consulting Engineers February 27 through June 30, 1997 $ 20,610 The state desires technical assistance from Leonard Rice to provide engineering services related to CRDSS development. The following two task orders are being executed at the same time, LR-l.. Management Issue Support LR-2... Enhancements to Colorado River Water Resources Planning Model. In the event that activities in these task orders compete for the available resources, LR-I activities will take precedence over those activities described in LR-2. As additional task orders are executed those task orders will describe the priority of those activities in relation to activities in other on-going task orders. These additional task orders may include the support of model development on the Gunnison River and the development of scope for a pc-based consumptive use model. Background Planning models for each major river basin in Western Colorado were developed as part of the Colorado River Decision Support System (CRDSS). The planning model for the Colorado River mainstem has been applied to help evaluate flows int he IS-mile reach of the Colorado River mainstem at Grand Junction and to help determine the possible impact of additional depletion above the reach and the benefits of the flow related RlPRAP items to the reach. During the initial application of the planning model for the Colorado River, several items were observed that require further refinements to the model in order to provide improved and more useful results, These refinements are described in the tasks outlined below. The work required under each task will be performed pursuant to the existing contract amendment with Ross Bethel and Leonard Rice Consulting Water Engineers dated January 15, 1997, The LR-2 task order has been divided into subtasks to facilitate description. Subtask LR-2a Reservoir Operations Modifications to Colorado River Calculated Scenario Obiective: Wintertime release patterns for the 16 major reservoirs in the Colorado River WRPM in the Baseline scenario do not appear to be consistent with current operating rules of the USBR, Denver and others. The objective of this subtask is to revise the modeled wintertime operation of these reservoirs by implementing changes suggested by the USBR and Denver. Emphasis will be placed on Green Mountain Reservoir, Granby/Windy Gap reservoirs, Willow Creek, Dillon, Williams Fork, Ruedi and Vega Reservoirs. I