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• <br />2.04.7 Hydrology Description <br />Surface Water <br />By virtue of the hydrologic protection which has been <br />implemented and is described in the Gingery Associates report <br />(contained in Section 2.05.3(4)) our operation is not <br />expected to directly adversely affect surface water systems. <br />Existing and proposed mining areas of Sunland Mining <br />Corporation lie in the Trout Creek drainage system which heads <br />in the panhandle area of Rio Blanco County, and. flows generally <br />north through the south-central part of Routt County to its <br />confluence with the Yampa River near the town of Milner. <br />Trout Creek generally flows continuously; during periods <br />of low flow, ground water recharge sustains the flow. All <br />streams of the drainage system have small, intermittent trib- <br />utaries. <br />The headwaters of Trout Creek are located on Mount Orno <br />• south of the permit area at an elevation of approximately <br />12,000 feet. Thus Trout Creek derives most of its runoff from <br />snowmelt in June and July (Figure E11-5). <br /> <br />Monthly hydrographs (Figure ell-7), and yearly hydrographs <br />(Figure E11-9) show variations in mean annual flows. Average <br />annual discharge at stream gaging stations on Trout Creek <br />(1953-1958) was 19,840 acre-feet per year. The drainage area <br />for Trout Creek at the gaging site is about 17 square miles. <br />Estimates of streamflow (Dames and Moore 1975) made at <br />sites within their analysis area of September 11,1974 are shown <br />in Table E11-4. <br />50 <br />