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I I I I I I I I I I I I I I I I I I I period of roughly November 1 through March 3 is. limited to the amount available in Louisville Reservoir at the beginning of the winter from previous storage of transferred direct flow rights, plus approximately 290 acre-feet which is decreed to Louisville Reservoir. The reservoir decree is normally in priority to divert water during this winter period which allows up to 290 acre-feet to be diverted into the reservoir and throvgh the water treatment plant. Due to hydraulic constraints and water quality problems at low volume in Louisville Reservoir, the usable capacity is estimated to be 130 acre-feet when the reservoir is full to the normal high water line. Therefore, the amount of water available for use from November 1 to March 31 of any year is currently limited to 130 acre- feet of usable carry-over storage plus the decreed volume of 290 acre-feet, for a total of 420 acre-feet. Actual water supply available for winter requirements may be less during drought years whe~ Louisville Reservoir is not able to be filled from transferred direct flow decrees. An analysis of treatment plant production records shows that the average total winter water use during the period November 1 through March 31 was approximately 300 acre-feet for the winters of 1978-79, 1979-80 and 1981-82. This correspondsto a per capita use of approximately 119 gallons per capita per day. Using the figure 119 gcd, future winter demands can be estimated based on previously discussed population projections. Projections indicate that the winter storage demand will equal or exceed the presently available storage supply of 420 acre-feet by the winter of 1984-85. A summary of projected storage requirements for both winter supply and summer carry-over storage is shown on Table 8. Assuming a 10 month period for construction, inspection and filling, the 20