Appendix 8 to Annex J


DAM FAILURE


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DEFINITION

 

•          Dam Failure - downstream flooding due to the partial or complete collapse of any impoundment.



SITUATION

 

•          Dam failure is associated with intense rainfall and prolonged flood conditions. However, dam breaks may also occur during dry periods as a result of progressive erosion of an embankment caused by seepage leaks. Dam failure may also be caused by earthquake.

 

•          The greatest threat from dam breaks is to areas immediately downstream. The seriously affected population would be located in the potential downstream inundation area as identified by the Corps of Engineers or State agencies.



1980 DAM INVENTORY

 

•          The 1980 Inventory of Non-Federal Dams in Missouri was compiled by the Missouri Department of Natural Resources, Division of Geology and Land Survey, under a contract with the U.S. Army Corps of Engineers, St. Louis District.

 

•          The term "dam," is defined as an artificial barrier which impounds or diverts water and:


Is more than 6 feet high and stores 50 acre-feet or more, or,

Is 25 feet or more high and stores more than 15 acre-feet.

Excluded are:

Levees used to prevent water from reaching certain areas.

Sewage lagoon levees.

 

•          The 1980 dam inventory identified twenty-three dams in Saline County. These dams are listed in Attachment A to this Appendix. A map showing their location is provided in Attachment B .



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