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I / ,- -...) r, below the mouth of the Washi ta River, Denison Dam forms Lake Texoma, with total capacity of 5,719,000 acre-feet at crest of spillway. This reservoir is used for power development and flood control. The mean annual flow past the gaging station near Colbert, immediately below Denison Dam, where the drainage area 'is 39, TT2 square miles, liaS 3,911,000 acre-feet during the period 1921-49; the average flow for the period 1938-49 liaS 4,288,000 acre-feet, 1-0. l'V -.,J C,,;, The Washita River rises in the eastern Texas Panhandle north of the North Fork drainage basin and flow southeasterly to enter Lake Texoma near Durvood, Oklahoma. The mean annual flow at the gage near Durwood, with a drainage area of 7,930 square miles, is about 1,400,000 acre-feet for the period 1938-49. The Washita River flows through a generally cultivated flood plain where bank-caving is becoming a problem. The flow of this stream is much more sus- tained than for the other major tributaries or for the main Red River above Denison Dam. Several hundred acres are irrigated by pumping from the river. Ley-water floys are highl,y mineralized, the dissolved solids being largely calcium sulphate. A study of the rainfall records in the Red River Basin on an annual basis reveals that the period of stream-flow records, 1938-49, bad an average rainfall considerably above the long-time average. For example, the 1938-49 average precipitation at Childress, Texas, liaS 23.3 inches compared with 47-year average of 21.9 inches. At Ardmore, Oklahoma, the average annual rainfall for 1938-49 is 40.45 inches, compared with a 48-year average of 37.4-0 inches. These records indicate that existing stream-flow records for the upper part of the basin shoy an average yield that is above noriDal. , 2-11