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<br /> <br />~ <br /> <br />Tributary streams <br />13. The South Fork. the major tributary within the affeoted <br />area. has a mean annual flow of 198 second-feet. Other tributaries <br />of importanoe are Goos.!LJlJ:Jl.ek with a mean annual flow of 59 second- <br />feet, which enters the Rio Grande ,L!D.ile below Wa&pl;!,.l1h~l Gap. and <br />Bellows Creek with an estimated mean annual flow of 40 seoond-feet. <br />which joins the river within the reservoir site. Other streams within <br />the impoundment area are Farmers. Willow, Sunnyside, Shallow, and Deep <br />Creeks. In addition there are mnall intermittent streams. <br />Geology <br />14. The area is one of high relief and has been subjeoted to <br />a long and varied history of alternating periods of deposition, <br />elevation. erosion, volcanism. and glaciation. For the most part, <br />the area is covered by rocks of Miocene age belonging to the Potose <br /> <br />volcanic series. This series is extremely complex and embraces many <br /> <br />varieties of rook ranging from water-laid pyroclastios to vast lava <br />flows. <br /> <br />Soils <br /> <br /> <br />15. The flood plain is typioal of a mountain valley with soils <br /> <br /> <br />of varying depth and texture. Salinity and alkalinity are absent <br /> <br /> <br />in the upper end of the San Luis Valley, but inorease in frequency <br /> <br /> <br />and conoentration downstree.m.. Large areas are outwash plains. West <br /> <br /> <br />of Center. Colorado. the soils are shallow (3 to 30 inohes), gravelly. <br /> <br /> <br />and light in texture. East of Center there is less gravel, more sand, <br /> <br /> <br />and excessive alkalinity. South of the Rio Grande the soils are <br /> <br /> <br />heavy and gravelly. Soils east of Ale.m.osa are heavier. less gravelly, <br /> <br /> <br />and more alkaline. <br /> <br />7 <br /> <br />1181 <br /> <br />