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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />the reservoir, including spills, and end of the month reservoir content <br />when the Snowball Reservoir is used to meet the entire Pagosa Springs <br />demand. <br /> <br />3.7.4 Conclusion <br /> <br />The operation study showed conclusively that there is- adequate water <br />available to supply the proj ected future demand of the town. The study <br />also showed that there would be no significant shortage throughout the <br />historic period of operation, if a reservoir of 2,900 acre-foot capacity <br />were constructed. The 1960 through 1980 period of operation represents a <br />below average sequence of years, and includes the driest year of record in <br />the San Juan Basin. The estimated recurrence interval of the critical 1977 <br />year, based on such long-term gage records as are available, is <br />approximately once in 30 years. The reservoir size could be reduced <br />slightly if some capability to use water from the San Juan River on an <br />emergency basis was provided, or if water saving restrictions - curtailing <br />outdoor watering, for example - were imposed in critical years. Continuing <br />to use water from the San Juan River would allow a smaller reservoir to be <br />built to avoid shortages, but this alternative would not allow the Town to <br />benefit from the improved water quality that would be available from using <br />the Snowball Reservoir and diversions from Turkey Creek. Finally, using <br />diversions from the San Juan River only to supplement water from Snowball <br />Reservoir does not significantly reduce the required capacity at the <br />reservoir. <br /> <br />3-18 <br />