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<br />. <br /> <br />. <br /> <br />, <br /> <br />RIO GRANDE WATER SUPPLY STUDY - PHASE I - STEP TWO <br /> <br />---------------------------------------------------------------- <br /> <br />Task 11-3 Refinement of Step One Study Assumptions on Rio Grande <br />Compact Operation. <br /> <br />---------------------------------------------------------------- <br /> <br />Purpose: <br /> <br />To review step One Study assumptions relative to <br />certain operational aspects of the Rio Grande Compact <br />and to revise those assumptions as necessary. <br /> <br />Approach: <br /> <br />An initial review of the original Step One Study <br />methodology with representatives - of local water user <br />organizations indicates several areas (indicated below) <br />of the Rio Grande Compact modeling which need further <br />investigation and possible refinement 0 <br /> <br />a) The demand on Rio Grande proj ect storage was <br />assumed in Step One to be 650,000 acre-feet (af) <br />per year. Investigations on the Rio Grande <br />Project demand will lead to the formulation of an <br />al ternative demand level to consider in the Step <br />Two study. <br /> <br />b) The step One assumptions on the accrual, <br />evaporation and use of credit water will be <br />reviewed for reasonableness. For example, Step <br />Two studies will model evaporation charges to <br />Colorado I s credit account which were not modeled <br />in step One. <br /> <br />C) The modeled operation of Abiquiu and Cochiti flood <br />control reservoirs in New Mexico will be modified <br />to release of stored flood flows prior to the next <br />runoff season. <br /> <br />d) Assumptions on the accrual and use of Colorado's <br />debit allowance will be investigated. <br /> <br />The generalized activities involved in this task are <br />indicated below. <br /> <br />1. LRCWE and MacDougall will investigate each Compact <br />aspect indicated above and report on the Step One <br />treatment, research conducted subsequent to Step <br />One modeling, and suggested refinements. <br /> <br />2. LRCWE and MacDougall will discuss suggested <br />refinements with the Study Advisorso Refinemen~s <br />will be incorporated into the R1BS1M model and <br />tested for proper operationo Model testing will <br />utilize the most recent version of the model (with <br /> <br />June 17, 1988 8 <br /> <br />~ Leonard Rice Consulting Water Engineers,lnc, <br />