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<br />III. INSTALLATION OF SELECTED PLAN <br /> <br />A. What Will Be Installed <br /> <br />Works of improvement to be installed consist of the following <br />(See Measure Map): <br /> <br />Map Location #1 - <br /> <br />A reinforced concrete combination gate and drop structure in <br />Shelton irrigation ditch that can be closed during flood times <br />and stop flow from continuing in the ditch west of Shelton <br />Lane. The gate portion of the structure will consist of two <br />openings, each 3 feet (91 cm) wide by 2 feet (61 cm) high to <br />allow the normal ditch flow of 20 cfs (0.S7 m3/s) to pass with <br />a small loss of head. The drop portion of the st'ructure would <br />have the capacity to lower the 100-year frequency design flood <br />flow, 162 cfs (4.6 m3/s) with the flashboards removed, into <br />the proposed earth floodway. <br /> <br />Map Location #2 - <br /> <br />A 2,071 foot (631 m) safety guard rail constructed of wood <br />posts and steel rail between Lincoln Street and the floodway. <br /> <br />Map Location #3 - <br /> <br />An excavated earth floodway would carry the 100 year frequency <br />flood flows 7,300 feet (2,22S m) to the Yampa River. The <br />floodway excavated along the east side of Shelton Lane be- <br />ginning at the Shelton irrigation ditch drop structure would <br />have a bottom width of 4 feet (122 cm) and a flow depth of 4.8 <br />feet (146 em) for the 169 cfs (4.8 m3/s) at the culvert inlet <br />under Shelton Lane south of the railroad tracks. The floodway <br />would continue west between Lincoln Street and the railroad <br />tracks. The limited distance between the street and tracks <br />will require taking half of Uncoln Street for the south side <br />slope of the floodway. The floodway would have a bottom width <br />of 6 feet (183 cm) and 2:1 side slopes. The floodway velo- <br />cities to the railroad track culvert inlet would be about 3.9 <br />ft/sec. (119 em/sec.) for the design flow. The flood~ay north <br />of the railroad tracks would carry the 191 cfs (S.4 m Is) In <br />varying bottom widths and side slopes, but most of the reach <br />would have a 4 foot (122 em) bottom width and 6:1 side slopes <br />with a flow depth of 3.S feet (107 cm) with velocities of 3.2 <br />fps (98 cm/s) , The county road culvert would restrict the <br />design flow of 191 cfs (S.4 m3/s) and some over land flow <br />would occur with no damage to the pastureland. The outside <br />curve of all sharp alignment turns will be rip-rapped for bank <br />protection. <br /> <br />4 <br />