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13 <br />.~ ~ 2ound off to 1.77 million acre-feet per year depletion. <br />(5) Amain stem Colorado River project's fair share cost of <br />the conservation plan can be calculated by the following <br />formula: <br />Project's Averace_Annual Water Depletion X $20 million <br />COST = 1.77 million acre-feet <br />d. For Green River Projects - Use Green River Gage <br />V <br />(1) Predevelopment Flows = 5,419,700 acre-feet per year obtained <br />from WPRS computer studies for the years 1906-1978. <br />(2) The average predevelopment flows at the Green River gage for <br />the years 1965-1978 were 5,367,200 acre-feet per year. The <br />ratio of yield of the long term hydrologic period to the <br />short term hydrologic period is: <br />5,419,700 <br />5,367,200 = 1.01 <br />This means that the long term hydrologic period (1906-1978) <br />was 1% wetter than the short term hydrologic period (1965- <br />._~. <br />' 1978) . - ~ -~ <br />(3) Present Flows. Flaming Gorge on the Green River began <br />filling in November 1962. Figuring at least 2 years to <br />fill up, the period 1965-1978 should clearly show the influ- <br />. ence of the reservoir on the river system. The historical <br />(recorded) flows at the Green River gage for that period <br />averaged 4,243,400 acre-feet per year. .The long term (1906- <br />1978) would be 1% greater than the figure above, based on <br />observations in part (2). Present flow at the Green River <br />