National Dam Safety Program. Dr. Henson Lake Dam (MO 31570), Missouri - Kansas City River Basin, Gasconade County, Missouri. Phase I Inspection Report.
PRC CONSOER TOWNSEND INC ST LOUIS MO
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This report assesses the general condition of the dam with respect to safety, based on available data and on visual inspection, to determine if the dam poses hazards to human life or property. Based upon the criteria in the guidelines, the dam is in the high hazard potential classification, which means that urban development with more than a small number of habitable structures could be effected in the event of failure of the dam. The inspection and evaluation indicates that the spillway of Dr. Henson Lake Dam does not meet the criteria set forth in the guidelines. Dr. Henson Lake Dam being a small size dam with a high hazard potential is required by the guidelines to pass from one-half of the Probable Maximum Flood to the Probable Maximum Flood without overtopping. Considering the number of inhabited dwellings located downstream of the dam, the PMF is considered the appropriate spillway design flood for Dr. Henson Lake Dam. It was determined that the reservoirspillway system can accommodate approximately 50 percent of the Probable Maximum Flood without overtopping the dam. Our evaluation also indicates that the reservoirspillway system can accommodate the one-percent chance flood 100-year flood without overtopping the dam.
- Hydrology, Limnology and Potamology
- Civil Engineering