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<br />. <br /> <br />O~184~ <br />ber.veen a 1-.3/1,.: 1 slope and the upstreaEl face is composed of pervious, <br /> <br />stable material, rolled in place. The section between the 1-3/4:1 <br /> <br />upstrewn slope cend n 3/4:1 dovmstream slope is composed of selected <br /> <br />impervious materiLlls Of s~md, clay, and some gravel, and rolled in <br /> <br /> <br />plaCE). Adjacent to this section, between the 3/4: 1 downstream slope <br /> <br /> <br />c,nd a l-3/4:1 downstream slope, which extends to elevation Gl90 and <br /> <br />thence on 0. 1:1 back slope is a section of semi-:ir.lpervious cempacted <br /> <br />mcl'Gerial composed of some clay, sand, grllvel, cobbles, Ilnd fine rock, <br /> <br />grading to coarse at the outer .3:1 slope. Covering this section and <br /> <br />forming the outside portion of the embankr.-.cnt is Il dumped rock Gnd <br /> <br />gre,vel fill grading to the COGrser reeks on the downstr"am f'"ce. <br /> <br />Upstream from the axis, lend under the ilnpervioul3 section <br /> <br />of the dmn, the overburden is excavated to b"drock. The cut-off <br /> <br />. <br /> <br />trench will have (l minimwJ Vlidth equal to the depth of overburd"n. <br /> <br />Concrete cutoff walls are not considered necessQry since only for rnr" <br /> <br />Qnd very short intervals will there be en npprecic.ble hcJl.ld on the dam. <br /> <br />The Spillway <br /> <br />The rnin spillway is a concrete-lined horseshee conduit 23 <br /> <br />feet in diameter placed in n trench cut tl~ough the rock of the left <br /> <br />abutment. Cutoff collllrs "round the tunnel arc provided <'l.t 20-foot <br /> <br />centers. A stillins basin is provided at the outlet ond in orcl"r to <br /> <br />clissipntc the energ;'l of clifJcharging water to prevent erosion of the <br /> <br />strellm bed. The inlet is a concrete gravity crest 40 feet wide, set <br /> <br />at elevation 6205, with r, bell-mouth entrl).nce. <br /> <br />. <br /> <br />59 <br /> <br />