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<br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />CHAPl'ER III <br /> <br />DESIGNS AND ESTIMATES <br /> <br />15 acres along with existing improvements. The Fruitland Canal and the <br />distribution laterals would traverse both public and private lands. <br />Because all of the privately owned lands were patented after October 2, <br />1888, the canal rights-of-way are reserved for the United States by the <br />act of August 30, 1890. <br /> <br />Project Works <br /> <br />Soap Park Dam and Reservoir <br /> <br />Soap Park Reservoir would have a total initial reservoir capac- <br />ity of 44,670 acre-feet, including 1,240 acre-feet of dead storage below <br />the outlet. An additional 4,690 acre-feet of surcharge storage capaclty <br />above the spillway crest would be utilized for temporary storage of flood <br />flows. Soap Park Reservoir would cover an area of 560 acres at normal <br />water surface elevation 8,440 feet. <br /> <br />As shCl'ln by the feasibility design drawing on the following <br />page, Soap Park Dam would be a rolled earthfill structure with a maximum <br />height of 244 feet above the present streambed. The dam would have a <br />crest width of 30 feet and a crest length of 1,120 feet at an elevation <br />of 8,454 feet. The center zone of the dam would be constructed with <br />impervious earth materials which would grade into pervious materials in <br />both the upstream and downstream zones of the dam. The upstream face of <br />the dam embankment would be protected by an outer layer of riprap 3 feet <br />in thickness extending from the dam crest down to a 20-foot berm at the <br />minimum water surface elevation of 8,280 feet. The dam embankment would <br />consist of 1,300,000 cubic yards of earth, 1,600,000 cubic yards of sand <br />and gravel, 120,000 cubic yards of misce~laneous fill, and 50,000 cubic <br />yards of riprap. With the allowances made for maintenance in the opera- <br />tion and maintenance cost estimates, the dam is expected to have a mini- <br />mum useful life of 100 years. <br /> <br />The dam site is in a narrow V-shaped gorge cut by Soap Creek <br />through the West Elk breccia formation. Exploratory drilling at the <br />site indicated little or no overburden on the abutments but showed a <br />maximum depth of about 24 feet to bedrock at the stream channel. Perco- <br />lation tests in the drill holes showed the bedrock to be watertight with <br />the exception of a few small cracks which allowed some movement of wate~ <br />Mancos shale forms the floor of the reservoir basin with more resistant <br />West Elk breccia along the sides and at the dam site. It is believed <br />that the reservoir basin is entirely watertight. <br /> <br />During preparation of the dam foundation, the area would be <br />stripped to an average depth of about 12 inches. A cutoff trench run- <br />ning perpendicular to the stream channel and located 100 feet upstream <br />from the dam axis would be excavated through overburden to bedrock. <br /> <br />16 <br />