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<br />-7~ <br /> <br />As a result of this situation, but also because of the availability of both <br />clays and clay sealing services, a considerable amount of ditch and <br />pond sealing work has been accomplished in this area--especially in the <br />Salida-Buena Vista area. <br />Area east of Pueblo -- In this area of the District, the canals are <br />--- <br /> <br />relatively flat and slow, the soils commonly clayey to sandy, and the <br />seepage losses f.or both canals and ponds, variable from low to high. To <br />date, very little Colorado State University project work has been devoted <br />to this area--mainly because the irrigation waters in many parts of this <br />area do intermittently carry a clay sediment. The need for clay sealing <br />on a planned basis, however, does e1dst in some areas--especially in <br />clear-water canals below large reservoirs. (Seel1i:tadleQ article-- <br />Lets Muddy the Ditch Water). <br /> <br />Procedure <br />Two general methods have been used in the initial clay sealing <br />activities in the District Area: (1) The float-in methods, and (z) the <br />membrane or blanket methods. Since most of the work, to date, has been <br />pointed at sealing rocky to gravelly soils. the discussion that follows reflects <br />this emphasis. Sealing finer-grained soils involves problems different <br />from those pre(lented by the rocky soils, but the idea of fitting the clay and <br />the procedure to the site conditions applies equally well in either case. <br />Float-J!! methods -- These methods -- where the clay sealing <br />material is carried into place by flowing water -- have been used almost <br />exclusively in canals. The actual procedures have varied with the accessi- <br />bility and steepness of canal. In instances where the canals are very steep <br />and inaccessible to trucks, the sealing procedure has been accomplished by <br />washing the clay into the flowing canal water at the upper end of the canal <br />section being sealed. On flatter. more accessible canals, the multiple-dam <br />method of installation has been used. It consists of the following steps: <br />1037 <br />