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).
The dams (the main dam and the check dam) are in significant hazard potential classification. Significant hazard potential category structures will be those located in predominantly rural or agricultural areas where failure may damage isolated homes, secondary highways or minor railroads or cause interruption of use or service of relatively important public utilities. The main dam is classified as small in the dam size category because its height is less than 40 feet, and it impounds less than 1,000 acre-feet of water. The check dam, which is three feet in height, forms a continuous barrier to the impoundment created by the main dam. The spillway of C & A Lake Dam does not meet the criteria set forth in the guidelines for dams having the above size and hazard potential. C & A Lake Dam being a small size dam with a significant hazard potential, is required by the guidelines to pass from 100-year to one-half of the Probable Maximum Flood without overtopping. Since there is significant hazard potential downstream of the dam and because of its location just upstream of a highway, the appropriate spillway design flood for C & A Lake Dam is one-half of the Probable Maximum Flood.
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).
Kohl Irrigation Lake South Dam is located in Audrain County in the State of Missouri, and crosses an unnamed tributary of Shady Creek. As the name of the dam implies, the water impounded by the dam is used for crop irrigation. The crest and the downstream slope of the dam have a tall, dense grass cover, which adequately protects the embankment material from surface runoff erosion. However, the upstream slope has a sparse vegetative cover, and surface runoff has eroded small drainage rivulets on the order of 1 to 3 inches on the upstream face. The upstream slope also has no riprap protection and, consequently, has been eroded by wave action. Nearly vertical faces up to 2 feet high were exposed near the crest of the dam and smaller scallops were also exposed along the reservoir rim. The dam material underlying the grayish-brown topsoil cover was revealed to be a mottled red, brown, and gray, moderately plastic clay with some silt and sand. There was no evidence of seepage or leakage through or below the dam. No signs of past or present instability were seen on the embankment except for the wave eroded upstream slope.
Based on the criteria in guidelines, the dam is in the high hazard potential classification, which means that loss of life and appreciable property loss could occur in the event of failure of the dam. Three to four farmhouses with associated farm buildings, three County roads, and one unimproved road would be subjected to flooding with possible damage and/or destruction, and possible loss of life. Monroe City Dam is in the intermediate size classification since it is more than 40 feet, but less than 100 feet high and impounds more than 1,000 acre-feet of water. Inspection and evaluation indicates that the spillway of Monroe City Dam meets the criteria set forth in the guidelines for a dam having the above size and hazard potential. Monroe City Dam is an intermediate size dam with a high hazard potential required by the guidelines to pass the Probable Maximum Flood without overtopping. It was determined that the spillway will pass 67 percent of the Probable Maximum Flood without overtopping the dam. Also, our evaluation indicates that the spillway will pass the 100-year flood; that is, a flood having a 1 percent chance of being equalled or exceeded in any given year.
Based on criteria set forth in the 'Recommended Guidelines for Safety Inspection of Dam', the dam is in the high hazard potential classification, which means that loss of life and appreciable property loss could occur in the event of failure of the dam. Perry City Dam is in the small size classification since it is less than 40 feet high and impounds less than 1,000 acre-feet of water. This inspection and evaluation indicates that the spillway of Perry City Dam does not meet the criteria set forth in the guidelines for a dam having the above size and hazard potential. It was determined that the spillway will pass 41 percent of the Probable Maximum Flood without overtopping the dam. The evaluation indicates that the spillway will pass the 100-year flood.
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).
