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<br />;,,1 <br />Z~I <br /> <br />C""; <br />~ <br /> <br />~ <br /> <br />~ <br />. ~ <br />'0"; <br /> <br />( ..--j <br /> <br />\'.. .~:'i <br /> <br />;;-, <br />'q <br />,I <br /> <br />o <br /> <br />:5 <br /> <br />J <br /> <br />9 <br /> <br />'-' <br /> <br />face indications are that the alluvium in the stream channel will <br /> <br />extend to considerable depth. Desi9n of the structure should be <br /> <br />such that it will resist thrust or rotation from hydrostatic or dy- <br /> <br />namic forces. A cutoff wall, or combination cutoff wall and sheet <br /> <br />piling must extend to sufficient depth to preclude significant under- <br /> <br />flow. The new structure should be located downstream sufficiently <br /> <br />to permit the drainages on the north and south sides of the creek <br /> <br />to discharge into the creek channel rather than Acequia Madre and <br /> <br />Cerro Canal, respectively, as they now do. The existing condition <br /> <br />has undoubtedly contributed to the sediment problem in the two <br /> <br />ditches. <br /> <br />V COST ESTHIATES <br /> <br />The cost estimates presented below are based on costs incurred <br /> <br />for the construction of a smaller, but similar structure which was <br /> <br />constructed on Rio San Antonio, Conejos County, Colorado, in 1970. <br /> <br />The 1970 costs have been adjusted to reflect 1974 conditions. <br /> <br />It is not possible to tie the walls to a solid abutment or to <br /> <br />rest the footings on a desirable foundation. Because of this situa- <br /> <br />tion concrete walls an~ slabs will be thicker than normally required <br /> <br />and the quantity of reinforcing steel must be increased over normal <br /> <br />requ i re~lents. The fo 11 owi ng cost est ima te refl ects an allowance for <br />thi s condition. <br />