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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />VI. PROJECT PLAN AND PRELIMINARY DESIGN <br /> <br />A. General <br /> <br />Thi s secti on of the report wi 11 present the recommendat ions for <br />rehabilitation of the structure, including a new spillway, and <br />backfilling of the existing spillway channel to stabilize the slide <br />area west of the spillway. <br /> <br />B. Spillway Alternatives <br /> <br />1. Alternative No.1 <br /> <br />This alternative consists of a closed conduit service spillway, <br />located about 240 feet + northwest of the outlet works. Figure II <br />shows the location of the service spillway in plan. Figure V shows <br />the profile of the service spillway. In order to correct the slide <br />problem to the west of the existing spillway channel, the area should <br />be backfilled with compacted material from near the slide to stabilize <br />the toe and prevent further movement of the sl i de. An emergency <br />spillway is included in addition to the service spillway to replace <br />the existing spillway. The emergency spillway would only function <br />during large floods or if the service spillway was clogged with <br />debris, etc. which would severely limit the capacity of the spillway. <br /> <br />The service spillway would consist of a concrete crest wall <br />20 feet in total length with a 10 foot straight drop into the head end <br />of a 60-inch diameter corrugated aluminum pipe (CAP) culvert. The <br /> <br />- VI-1 - <br />