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<br />. <br /> <br />Figure III-2 <br />Year-by-Year Water Use <br /> <br />. <br /> <br /> 350,000 <br /> 300,000 <br /> 250,000 <br />- <br />" 200,000 <br />" <br />'" <br />, <br />" 150,000 <br />.. <br />" <br />< 100,000 <br /> 50,000 <br /> 0 <br /> 1963 1966 1969 1972 1975 1978 1981 <br /> <br /> <br />. <br /> <br />. <br /> <br />1984 1987 1990 1993 <br /> <br />. <br /> <br />Typically, direct flow (run-of-the-river) rights are the first water rights used to meet <br />demand. The next increment of supply usually comes from exchanges using reusable <br />return flows (exchanges are explained later in this chapter), The remaining water <br />demand, if any, is normally supplied with storage water from Strontia Springs, Marston, <br />or Ralston reservoirs. Most of the water in Marston and Strontia Springs is transferred <br />from Dillon and Cheesman reservoirs or stored in Strontia by exchange; Ralston <br />Reservoir water is primarily transferred from Gross Reservoir. The water stored in <br />Antero and Eleven Mile reservoirs is normally reserved for use in droughts, while <br />Williams Fork Reservoir water is used for replacement for out-of-priority diversions <br />elsewhere in the system. <br /> <br />. <br /> <br />. <br /> <br />In 1993, Denver Water staff prepared a Drought Response Plan to be used as a guideline <br />for Denver Water in managing water supply and use during a severe or multi-year <br />drought. The plan has been updated and is being issued separately from this report. <br /> <br />. <br /> <br />System Yield <br /> <br />The concept of yield is critical to any analysis of Denver Water supplies. It enables staff <br />to compare existing and new resources on an equivalent basis. It also permits the <br />comparison of available supply and customer demand. Thus, a prerequisite to evaluating <br />alternative resource strategies is an understanding of the manner in which Denver Water <br />quantifies system yield, <br /> <br />. <br /> <br />Denver's approach to determining the yield of its existing water collection system is <br />based on calculating the water demand that could be met during a representative study <br />period. This approach assumes that current Denver Water facilities existed over that <br />historical period and further assumes the current status of Denver's water rights <br />ownership and operations. To accomplish this analysis, Denver relies on a detailed <br /> <br />. <br />, <br /> <br />14 <br /> <br />. <br />