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<br />. <br /> <br />I <br /> <br />. <br /> <br />carried to rock or shole and from its center ~ concrete cuteff ~nll <br /> <br />rises from .5 to 10 feet depend ing on the depth of cover. If neces- <br /> <br />sary the cutoff wall will be founded over grout h"les en .5-foot <br /> <br />centers. The estimate presented rrakes provision far such gr,)uting <br /> <br />over two-thirds the length of the dam, omitting groutinr where the <br />dRm rests on shale. Grouting ever the full length may be feund <br /> <br />neceSS8.ry. <br /> <br />The dikes have the same external section as the main dam, <br /> <br />but the rock fill on the downstream slope is reduced to a uniform <br /> <br />thickness of two feet on each of them. A cutoff trench and wall <br /> <br />will be used for No.3. but the cutoff trench will be sufficient <br /> <br />for Nos. 2 ~nd 4. All the structures will be provided with toe <br />dr8.ins. <br /> <br />Outlet Works <br /> <br />A concrete outlet conduit, rest ing on sCUldst one, is <br /> <br />placed in open cut under the embankment of the main dam, approxi- <br /> <br />mately in the bed of the arroyo. A circular trashrack structure of <br /> <br />concrete at its upper end, qdmits water down to elevation 7910, <br /> <br />which Will completely empty the reservoir. The conduit is three <br /> <br />feet in internal diameter above the g3te chamber which is locqted 20 <br /> <br />feet upstream from the axis of the dam; below the gate chamber, <br /> <br /> <br />the section is 7 feet 1 inch by 6 feet 3 inches in horseshoe <br /> <br /> <br />shape to provide room for the steel outlet pipes and for access <br /> <br />29 <br /> <br />z:.r\. 2. <br />