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<br />Table 2. Summary of Discharges <br /> <br />Flooding Source <br />and Location <br /> <br />Drainage Area <br />(Square Miles) <br /> <br />Peak Discharges <br />(Cubic Feet per Second) <br />la-Year 50-Year lOa-Year SOO-Year <br /> <br />Animas River <br />At Confluence With <br />Mineral Creek <br />At Confluence With <br />Cement Creek <br />Power Plant (1 Mile <br />Upstream of Silverton) <br /> <br />Mineral Creek <br />u.S. Highway 550 <br />West of Bear Creek <br /> <br />149.81 3,050 5,180 6,460 11,280 <br />96.77 2,270 3,850 4,770 8,270 <br />72.48 1,870 3,160 3,910 6,740 <br />51.63 1,490 2,500 3,090 5,300 <br />42.67 1,310 2,200 2,710 4,630 <br /> <br />Cement Creek <br />At Confluence With <br />Animas River <br /> <br />20.65 <br /> <br />800 <br /> <br />1,340 <br /> <br />1,640 <br /> <br />2,760 <br /> <br />3.2 Hydraulic Analyses <br /> <br />Analyses of the hydraulic characteristics of streams in the commu- <br />nity were carried out to provide estimates of the elevations of <br />floods of the selected recurrence intervals along each stream <br />studied in the community. <br /> <br />Cross section data for streams in the area were obtained from aerial <br />photographs (Reference 9); below-water cross sections were obtained <br />by field measurement. All bridges and culverts were measured to <br />obtain elevation data and structural geometry. <br /> <br />Locations of selected cross sections used in the hydraulic analyses <br />are shown on the Flood Profiles (Exhibit 1). For stream segments <br />for which a floodway is computed (Section 4.2)! selected cross <br />section locations are also shown on the Flood Boundary and Floodway <br />Map (Exhibi t 2). <br /> <br />A proposed tailings pond on the east side of Silverton (Reference 10) <br />is presently under construction. In the vicinity of the new tailings <br />pond, State Highway 110 and Animas River channel have been relocated. <br />The new locations of State Highway 110 and Animas River were con- <br />sidered in the hydraulic analyses. <br /> <br />9 <br />