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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 />o <br />,-~) <br />w <br />... <br />Q') <br />N <br /> <br />GRAND VALLEY SUBBASIN <br /> <br />Location and Description <br />The Grand Valley Subbasin includes the drainage <br />area of the Colorado River from the mouth of Plateau Creek <br />down to the Colorado-Utah State line except for the Gunnison <br />River Basin. The altitude varies from an elevation of 4,300 <br />feet at the State line to about 8,000 feet on the Colorado <br />River~White River divide north of Grand Junction. Subbasin <br />watershed strear..s are intermittent. Seventy percent of the <br />subbaSin is located in Kesa County and 30% in Garfield County. <br />The subbasin contains only about 12.9% of the river <br />basin :drainage area but in tern,s of basin developn;ent it <br />accounts for about 26.1% of the irrigated land and 64.l~~ of <br />the basin population. The agriculture income amounts to 44% <br />of the total for the entire river basin. <br />\Jater Runoff <br />The river runoff discharged from the subbasin at the <br />Colorado-Utah State line for the 18 year study period averaged <br />152,200 acre feet per year less than the total an;ount of water <br />enteri~g the subbasin from the Rifle-\1est Divide Subbasin, the <br />Plateau Creek Subbasin and the Gunnison River. The water run_ <br />off of each of these subbasins along with the net subbasin in- <br />flow is given in the following table: <br /> <br />36 <br />