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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 reservoir/spillway system can accommodate approximately 50 percent of the Probable Maximum Flood without overtopping the dam. Our evaluation also indicates that the reservoir/spillway system can accommodate the one-percent chance flood (100-year flood) without overtopping the dam.
This report was prepared under the National Program of Inspection of Non-Federal Dams. 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. (Author).
This report was prepared under the National Program of Inspection of Non-Federal Dams. 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. (Author).
This report was prepared under the National Program of Inspection of Non-Federal Dams. 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. (Author).
Ray County Dam No. A-1 was inspected to make an assessment of the general condition of the dam with respect to safety, based upon available data and visual inspection, in order to determine if the dam poses hazards to human life or property. Our inspection and evaluation indicates the spillway does not meet the criteria set forth in the guidelines for a dam having the above size and hazard potential. The spillway will not pass the probable maximum flood without overtopping but will pass 60 percent of the probable maximum flood, which is greater than the 100-year flood. The spillway design flood recommended by the guidelines is the probable maximum flood. The probable maximum flood is defined as the flood discharge that may be expected from the most severe combination of critical meteorologic and hydrologic conditions that are reasonably possible in the region. Deficiencies visually observed by the inspection team were minor amounts of erosion along cattle paths, and erosion of the discharge channel.
The Loch Leonard Dam is an earthfill structure approximately 19 ft. high and 1900 ft. long at the crest. The appurtenant works consist of: a pump station with an 8-inch discharge pipe from the lake to a Missouri Public Service Co. power plant; a pump station in the stream by the lake with one 18 inch diameter pipe to the settling basin; a 15 inch diameter CMP from the settling basin to the stream; and a 60 inch diameter pipe between the lake and settling basin. Our inspection and evaluation indicates that the combined spillways do not meet the criteria set forth in the guidelines fro a dam having the above size and hazard potential. The combined spillways will pass 9 percent of the Probable Maximum Flood without overtopping. Deficiencies visually observed by the inspection team were: (1) Some brush and small trees on both faces of the dam; (2) Seepage area the downstream toe across from Sta. 2 + 50; (3) Seepage through the embankment across from the pump station at Sta. 11 + 30; and (4) Inlet to 15 inch primary spillway pipe out of the settling basin is blocked with vegetation and debris.