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Alternative Agricultural Water Transfer Methads -Grant Application Form <br />January 201)8 <br />Subtask D-2. Transfer of Reduced Flow Diversions: Determine the effects of reduced <br />flaw diversions through the headgates of participating canals, associated with leasing and <br />transfer of such flow reductions to upstream locations, on: <br />a. return flows and mass loadings (salt and selenium) to the main stem river and <br />tributaries <br />b. streamflow rates in the mainstem river and tributaries <br />c. water quality {concentrations of dissolved constituents) along the river and <br />tributaries. <br />Subtask D-3. Water Rights Compliance: Provide assistance to members of the project <br />team with primary responsibility for this task in determining how leasing options can be <br />exercised to insure compliance with Colorado water rights and the Arkansas River Compact. In <br />collaboration with members of the project team focused on this task, the GeoDSS will be <br />applied to providing assistance in evaluating the combination of leasing scenarios resulting in <br />avoidance of adverse impacts on existing water rights along the main stem and tributaries, as <br />well as enhancing beneficial influences on the irrigated stream-aquifer system. <br />Subtask D-4. Groundwater Basin and Return Flow Impacts: Estimate how reduced <br />canal diversions associated with leasing transfers would impact groundwater table depths and <br />non-beneficial consumptive use of water from uncultivated lands if current recharge quantities <br />from deep percolation and canal seepage associated with lands to be fallowed are instead <br />stored in reservoirs. Optimal reservoir release strategies will be evaluated to mimic streamflows <br />as affected by historical return flow patterns {i.e. patterns that would have occurred had the <br />Super Ditch lease-fallowing program not been implemented}. <br />Subtask D-5. Proposed Pipeline Alternatives: Simulate the impacts on water rights, <br />water quality, and the Colorado-Kansas Compact of proposed pipeline alternatives to augment <br />the existing exchange capacity of the Arkansas River for transport of flow to the lease-fallowing <br />program customers. <br />Subtask D-6. Water Right Change Case: Provide assistance to members of the project <br />team with primary responsibility for this task in evaluating the feasibility of changing several <br />direct flow rights awned by participants in the Super Ditch Cooperative to storage rights in <br />available reservoirs to enhance the ability to lease year-round flows. Based on available <br />exchange potential, the GeoDSS will applied to providing assistance in evaluating the impacts <br />of these change cases on existing water rights, water quality, water conservation, and the <br />Arkansas River Compact will be evaluated. <br />Subtask D-7. Optimize Water Quality Improvement: Although the Super Ditch <br />Cooperative is a voluntary program to l,e administered by the shareholders themselves, the <br />Arkansas River Basin GeoDSS will be applied to initialize the process of developing preliminary <br />lease-fallowing schemes under the Super Ditch that will optimize water quality improvements <br />and water conservation along the river. <br />Deliverables: Six Month Progress Report, Final Project Report, and Executable GeoDSS <br />Software for Lower Arkansas River Basin. <br />27 <br />