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National Dam Safety Program. Cadet Mine Tailings Dam (MO 30715), Mississippi - Kaskaskia - St. Louis Basin, Washington County, Missouri. Phase I Inspection Report.

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Final rept.,

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Cadet Mine Tailings Dam, I.D. No. 30715 was inspected to assess the general condition of the dam with respect to safety. The assessment was based on an evaluation of the available data, a visual inspection, and an evaluation of the hydrology and hydraulics of the site to determine if the dam poses hazards to human life or property. The purpose of the dam is to impound tailings from a barite separation and beneficiation operation. The results of the inspection indicate an absence of facilities for discharging flood water, inadequate freeboard, and that the dam does not meet the criteria given in the Guidelines for a structure with the size and hazard potential of Cadet Mine Tailings Dam. As an intermediate size dam with a high hazard potential, the Guidelines specify that the discharge capacity andor storage capacity should be capable of safely handling the Probable Maximum Flood PMF without overtopping the crest. The PMF is the flood that may be expected from the most severe combination of critical meteorologic and hydrologic conditions that are reasonably possible in the region. It was calculated that the impoundment can retain the 100-year flood a flood having a one percent chance of being equalled or exceeded in any one year without overtopping the dam. It was also estimated that the impoundment can retain 75 percent of the PMF without overtopping the crest. However, the impoundment cannot retain the PMF without overtopping the embankment. Adequate overflow facilities andor freeboard should be provided so that the impoundment can handle the PMF without overtopping the crest and without significant erosion of the embankment.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

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