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<br />, <br /> <br />. <br /> <br />RIO GRANDE WATER SUPPLY STUDY - PHASE I - STEP TWO <br /> <br />---------------------------------------------------------------- <br /> <br />Task 11-6 preparation and operation of RIBS 1M computer model to <br />estimate storable flows at four potential storage sites <br />under several assumptions. <br /> <br />---------------------------------------------------------------- <br /> <br />Purpose: To revise and operate the RIBSIM computer model of the <br />Rio Grande Basin to reflect changes to study <br />assumptions from Tasks II-I, 11-2, 11-3, and II-50 <br /> <br />Approach: The complexity of the Rio Grande Basin dictates the use <br />of a computer model for water availability studies. <br />The RIBSIM computer model was prepared and calibrated <br />for the Step One water availability simulations of the <br />Rio Grande Basin and is an appropriate tool for <br />investigating the effect of alternative water supplies <br />and demands on available flow. Activities include: <br /> <br />1. LRCWE will combine the model refinements from Task <br />II-I, 11-2, 11-3 and 11-5 into a single model and <br />test for proper operation of each refinement. If <br />necessary, revisions will be made such that the <br />refinements operate correctly together. <br /> <br />2. <br /> <br />LRCWE will operate the model and <br />storable flows for each of the <br />scenarios: <br /> <br />determine <br />following <br /> <br />Case A: <br /> <br />Case B: <br /> <br />Case C: <br /> <br />June 17, 1988 <br /> <br />This is the base scenario for the Rio Grande <br />Basin excluding the Closed Basin proj ect. <br />This scenario is similar to the base scenario <br />used in Step One of the study but includes <br />model refinements made in Tasks II-I, 11-3 <br />and 11-5. The Rio Grande Project Demand will <br />be operated at the 650,000 af/year in this <br />scenario. This scenario is included for <br />comparison purposes with the other scenarios 0 <br /> <br />The first Closed Basin Project scenario (from <br />Task II-2) will be superimposed on the base <br />scenario (Case A). Comparison of the results <br />of this Case with Case A will allow <br />determinations of the effect of a Closed <br />Basin operating scenario on storable flows. <br /> <br />The second Closed Basin Project scenario <br />(from Task 11-2) will be superimposed on the <br />base scenario (Case A) 0 Comparison of the <br />results of this Case with Case A will allow <br />determinations of the effect of an <br /> <br />14 <br /> <br />ct> Leonard Rice Consulting Waier Engineers,lnc, <br />