Accession Number:

ADA106221

Title:

National Dam Safety Program. Dessieux Lake Dam (MO 30994), Mississippi - Kaskaskia - St. Louis Basin, Washington County, Missouri. Phase I Inspection Report.

Descriptive Note:

Final rept.,

Corporate Author:

HORNER AND SHIFRIN INC ST LOUIS MO

Personal Author(s):

Report Date:

1978-12-01

Pagination or Media Count:

44.0

Abstract:

The purpose of the inspection was to assess the general condition of the dam with respect to safety and, based upon this inspection and available data, determine if the dam poses a hazard to human life or property. Based on the criteria set forth in the recommended guidelines, and since numerous homes and a summer camping facility lie within the estimated flood zones, recommended spillway design flood for this dam, which is classified as small in size and of high hazard potential, is Probable Maximum Flood PMF. 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. Results of a hydrologichydraulic analysis indicated that the existing spillways principal and emergency are inadequate to pass the lake outflow resulting from a storm of PMF magnitude without overtopping the dam. A similar analysis also indicated that the spillways are inadequate to pass the lake outflow resulting from the 1 percent chance 100-year frequency flood without overtopping the dam. The spillways are capable of passing lake outflow corresponding to approximately 13 percent of the PMF without overtopping the dam. The length of the downstream damage zone, should failure of the dam occur, is estimated to be six miles.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE