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<br />L" <br />()J <br />N <br />C) <br />(~) <br /> <br />CHAPTER V <br /> <br />STAGE TWO PLAN OF DEVELOPMENT <br /> <br />~".'. <br />-,' <br /> <br />Nets. cables, and safety ladders would be installed inmediately <br /> <br />upstream of all siphons. flumes, and checks. <br /> <br />Handrails would be con- <br /> <br />structed on the operating platforms of the check structures and safety <br /> <br />ladders would be installed on both sides of the canal at 750-foot <br /> <br />intervals. <br /> <br />Cross-drainage structures would be constructed to protect the <br /> <br />concrete-lined canal. Based on analyses of Stage One construction costs, <br /> <br />cross-drainage designs for Stage Two would include a 25-year design <br /> <br />flood instead of a lOO-year flood. Present cross-drainage facilities in <br /> <br />the minor drainages consist of a series of culverts which are in poor <br /> <br />condition due to age and siltation. These facilities would be replaced <br /> <br />with a detention ditch and dike system. As in Stage One, they would be <br /> <br />constructed uphill and parallel to the canal. <br /> <br />The ditch would collect <br /> <br />floodflows and convey them to drainage channels where they would cross <br /> <br />under the canal through concrete boxes or corrugated metal culverts <br /> <br />or through overchutes. <br /> <br />Existing facilities on the drainages below the canal would be <br /> <br />evaluated individually during preconstruct ion. Any of these structures <br /> <br />that would not safely carry the flood that the canal facilities pass <br /> <br />would be either improved or replaced. <br /> <br />If it is determined to be more <br /> <br />practical to leave these structures as they are, detention dikes would be <br /> <br />constructed on those drainages above the detention ditch to limit the <br /> <br />floodflows to the capacity of the existing downstream structures. <br /> <br />The Stage Two portion of the Government Highline Canal is divided <br /> <br />into three segments: the east end, the middle, and the west end. These <br /> <br />segments are discussed on the following pages. Government Highline Canal <br /> <br />32 <br />