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<br />~ <br />OJ <br />N <br />o <br />::> <br /> <br />CHAPTER V <br /> <br />STAGE TWO PLAN OF DEVELOPMENT <br /> <br />.-""-, <br />-,' <br /> <br />of Mack.l/ The additional 6.8 miles is the canal segment recently lined <br /> <br />under Stage One. <br /> <br />Major existing structures along the canal, including siphons, flumes, <br /> <br />and bridges would be evaluated as to their structural and hydraulic <br /> <br />soundness, and would be replaced if necessary. <br /> <br />All turnout structures <br /> <br />would be replaced and several new wasteway and centerline check struc- <br /> <br />tures would be added to control the canal water surface elevation. <br /> <br />The concrete lining would be 2 1/2 inches thick for canal capacities <br /> <br />less than 500 cubic feet per second (cfs) and 3 inches thick for capaCl- <br /> <br />ties greater than 500 cfs. Transverse contraction joints would be pro- <br /> <br />vided at 10- to l5-foot intervals for the entire length of the canal, and <br /> <br />longitudinal contraction joints would be provided in the larger sections. <br /> <br />Canal base widths would vary from 3 to 12 feet, depths from 2 to 9 feet, <br /> <br />and all side slopes would be 1 1/2:l. Canal lining freeboard would range <br /> <br />from 1/2 to 1 1/2 feet and the total canal freeboard would range from <br /> <br />1 1/2 to 3 1/2 feet. <br /> <br />Operation and maintenance roads would be constructed on both sides <br /> <br />of the canal where practical. <br /> <br />The roads upstream of Stage One would <br /> <br />be 16 feet wide, while the roads downstream would be 12 feet wide. <br /> <br />The canal would generally be fenced on both sides. Wire mesh fence <br /> <br />would be used on the south side of the canal, while stock fence would be <br /> <br />used on the north side. The siphon inlets would be enclosed by a 7-foot <br /> <br />chain link safety fence. The need and exact location of other safety <br /> <br />fences would be determined during the preconstruct ion studies. <br /> <br />1/ The first 6 miles of the canal from the Grand Valley Diversion <br />Dam to Palisade was excluded because the canal traverses the Mesa Verde <br />Formation, a much less saline formation than the Mancos Formation; and <br />because of its large capacity, it would be expensive to line. <br /> <br />31 <br />