Laserfiche WebLink
<br />1542 <br /> <br />August 19, 1999 <br /> <br />of Project yield data (1966-1990) obtained from the USBR and the maximum demands that <br />could occur under the current Project operating principles (total Western Slope diversions limited <br />to 120,000 ac-ft/yr, etc.). The study concluded that a total of 92,500 ac-ft of storage in Eastern <br />Slope Fry-Ark reservoirs (Turquoise, Twin Lakes and Pueblo) which is currently allocated to <br />Project Storage could be used for other purposes without injury to Project beneficiaries. Of this <br />total, 57,900 ac-ft was available in Pueblo Reservoir. However, the study did non include in- <br />priority east slope Arkansas River water rights, which need to be protected under any reoperation <br />plan. <br /> <br />Modeling Approach to Evaluation and Analvsis of Storage Utilization <br /> <br />The current approach is to use a MODSUvI model in a series of incremental steps to evaluate the <br />impact of storage of non-project water in project space. The first step is to extend the current <br />MODSlM model recently developed by Montgomery Watson for CSU to include the years 1966 <br />through 1995. This extension primarily includes the inclusion of additional years of Boustead <br />Tunnel inflows to Turquoise Reservoir. In addition, as a part of model development, the <br />reservoir capacities, reservoir evaporation rates, and system operation rules will be reviewed and <br />checked for current validity. <br /> <br />Once the base model is complete the yield from Fry Ark native Arkansas River water rights will <br />be added to the model. These water rights generate project yield in very wet times of certain <br />years during free river conditions. The periods when Fry-Ark native Arkansas River water rights <br />are in priority that have occurred through the study period include: <br />1985- May 26 through June 29 <br />1987- March 24 through April 30; May 5 through June 28; and June 30 through July 6 <br />1995- July 12 through August 3 <br /> <br />The storable yield that occurs from these water rights will then be determined through the use of <br />the model. The native water will be delivered to project beneficiaries under the projected <br />agricultural and municipal demand schedule developed by GEl (1999). Storage priorities will be <br />assigned in the following order: <br />I) FryArk Project Water <br />2) Winter Water <br />3) Other Storage <br /> <br />Sources of FryArk project water are Boustead Tunnel imports from the Upper Roaring Fork <br />River basin and native Arkansas River flows. Project agricultural demands must be used before <br />May I of the following year during which the water was stored; no multi-year carryover storage <br />of agricultural demands can occur without District approval. Project municipal demands are <br />used according to the projected demand schedules and carryover storage can occur. Winter <br />water is stored from November 15 to March 14, and must be used in the following irrigation <br />season. Nonproject water in project space can then be stored in the remaining storage space. As <br />a result of performing this analysis the amount of storage space available for storing non-project <br />water in project space will be determined on a monthly basis over the thirty year study period. <br /> <br />3 <br />