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<br />. <br /> <br />. <br /> <br />. <br /> <br />V. <br /> <br />DATA COLLECTION <br /> <br />On October 23, 1995, the CWCB completed a field visit to the Town of Frisco to meet <br />with local officials and to gather information and field data pertinent to the project. In <br />addition, a field survey was performed by the CWCB on November IS, 1995. The <br />purpose of the field survey was to obtain channel cross-sections of Tenmile Creek <br />between Highway 9 and 4th A venue, and to measure the existing pedestrian bridge and <br />roadway culverts. <br /> <br />VI. AL TERNA TIVE PROJECT PLANS <br /> <br />Three selected methods of providing lOG-year flood protection along the study reach of <br />Tenmile Creek were investigated. They are as follows: <br /> <br />1. Fill material placement to create a uniform landform (levee) along the <br />right (south) bank of the creek downstream of 4th Avenue. <br /> <br />2. Fill material placement combined with a grouted rock wall to create a <br />uniform levee system along the right (south) bank of the creek downstream <br />of 4th Avenue. <br /> <br />3. Channel capacity improvements (widening) in combination with fill <br />placement to create a uniform landform (levee) along the right (south) <br />bank of the creek downstream of 4th Avenue. <br /> <br />The first alternative consists of placing fill material along the right (south) bank of <br />Tenmile Creek from station 13+00 to 17+37. The fill would be an embankment, which <br />could be considered as a levee system, with a 10' top width (minimum) and 3H to I V (or <br />flatter) side slopes. The levee system would be shaped and landscaped so as not to appear <br />like an "engineered" levee. Alternative I would be the least cost alternative. <br /> <br />The second alternative consists of placing a smaller amount of fill material, in the same <br />manner as the first alternative, with the addition of a grouted rock wall that would <br />complete the levee system. Both alternative I and alternative 2 would accomplish the <br />same goal, but would provide different options in terms of construction materials and <br />aesthetics. Alternative 2 would be more expensive than alternative I, but less expensive <br />than alternative 3. <br /> <br />The third alternative consists of excavating the left (north) overbank area through a <br />portion of Walter Byron Park, possibly in conjunction with a levee system as in <br />alternative I and alternative 2. The existing bike path and pedestrian bridge would be <br />relocated, and the existing vegetation (trees, shrubs, grass) would be replaced or <br />relocated. The excavation would increase the channel conveyance area in hopes of <br />reducing the lOO-year water surface elevation through that reach. The channel widening <br /> <br />5 <br />