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GA-4 <br />Surface drainage from the sodium lease tracts is controlled by a <br />series of intermittent streams, all of which flow toward Yellow <br />Creek with the exception of Horse Draw. Yellow Creek is <br />predominantly an intermittent stream, however, some reaches and the <br />mouth of the stream will flow year-round. <br />The drainage area of Yellow Creek, measured at the USGS Yellow <br />Creek station, near White River is 262 square miles. Average <br />annual discharge is 1.90 cfs (1,380 acre-feet per year) for the <br />period from October. 1972 to September 1982, with a maximum daily <br />flow of 500 cfs (USGS 1983), and a maximum instantaneous flow of <br />6,800 cfs (September 7, 1978). <br />GA.2.3 Diversions and Water Rights <br />The majority of surface waters in the region are used for <br />agricultural purposes including irrigating hay meadows in the low <br />• land areas and stock watering. Weeks et al, (1974) estimated <br />approximately 5,100 acres in Piceance Creek Basin and 200 acres in <br />Yellow Creek Basin are irrigated annually. Irrigation diversions <br />usually begin in mid-March and continue through early November. <br />The amount of water diverted and number of acres irrigated at any <br />one time are dependent on water availability, water-right <br />priorities, crop type and weather conditions. Wymore (1974) <br />estimated annual streamflow depletions due to irrigation as 3,950 <br />acre-feet in the Piceance Creek Basin and 5o acre-feet in the <br />Yellow Creek Basin. <br />NaTec is the owner of several direct flow and storage rights as <br />well as groundwater rights in the White River/Piceance Creek/Yellow <br />Creek drainage basin in Rio Blanco County. The White <br />River/Piceance Creek/Yellow Creek water rights have been secured to <br />function as an integrated system of providing a water supply for <br />uses associated with NaTec's sodium leases. <br />• NaTec's direct flow right, Wolf Ridge Feeder Pipeline, diverts <br />from White River about one mile downstream of the <br />confluence with Piceance Creek. The storage right, Wolf Ridge <br />