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I I I I I I I I I I I I I I I I I I I o ':"'l W ...... Q') m 86,600 acres. It is estimated that 4,600 acres of this will ultimately be used for industrial purposes and urbanization leaving 82,000 acres as the net area of irrigated land. The increase in stream depletion resulting from expanded irriga- tion would be 13,900 acre feet per year. Subbasin population expanded from 22,242 in 1930 to 47,999 in 1960. This is a 30 year growth of 25,757 persons or 116% over the population of 1930. Estimates of futrue growth indicate the population may well reach 126,000 about the y~ar 2000. This would be a 40 year growth of 78,000 per- sons. This anticipated growth provides allowance for shale oil development in the Rifle-West Divide Subbasin as previously discussed. Based on a population of 126,000, the n,unicipal, domestic and industrial water use would be about 40,000 acre feet per year. The increase in stream depletion resulting from this expanded ffiunicipal, do~estic, industrial and asso- ciated use of water would amount to 11,300 acre feet per year. The esti~ated present and potential stream deple- tion for the Grand Valley Subbasin is summarized in the follow- ing table: Anticipated Total Stream Depletion - Acre Feet Present annual stream depletion *Anticipated annual stream depletion for expanded irrigation Anticipated annual stream depletion for expanded n.unicipal and indus- trial use and reservoir evaporation Sub-total potential stream depletion Anticipated total annual stream depletion 214,700 13,900 11,300 25,200 25.200 239,900 i,cIncludes allowance for natural vegetation, seeped land and water surfaces without limitation to man-made depletion. 40 .i ~~