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<br />. <br /> <br />A flood profile can be constructed from the above infor- <br />mation which graphically depicts flood elevations between <br />cross-sections. From the water surface profile shown in the <br />Appendix, the station of flood contours which correspond to <br />the base map contours was determined to create a plotting <br />table which was then used to make the following map of the <br />floodplain. <br /> <br />Flood Damages <br /> <br />A study of the flooded area map shows that a lOa-year <br />flood will inundate several mine facilities including the <br />waste dumps, storage areas, helicopter pad, concrete settling <br />pond, three earthen settling ponds, a shed, twelve propane <br />tanks, and the foundations of the Ore Sorter. Flood depths <br />at these facilities can be determined from the water surface <br />prOfile in the Appendix. <br /> <br />Several structures appear to be located above the flood- <br />plain including the temporary waste rock handling area, the <br />old water treatment plant and evaporation pond, old office <br />and change house, new office, several sheds, a warehouse, the <br />power sub-station, and the core shed. <br /> <br />. <br /> <br />Average flood velOcities range frOm 10 to 18 feet per <br />second in this reach and are quite high. For this reason, <br />the potential for severe erosion is great and the possibility <br />of mine facilities located in and even adjacent to the flOOd- <br />plain being washed downstream during a large flood should be <br />considered a definite high risk. <br /> <br />. <br />