National Dam Safety Program. Duck Creek State Wildlife Refuge - Pond Number 2 (MO 40093), Mississippi - St. Francis River Basin, Stoddard County, Missouri. Phase I Inspection Report

摘要

Duck Creek State Wildlife Refuge - Pond 2 was inspected by an interdisciplinary team of engineers. The purpose of this inspection was 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 that the spillways do not meet the criteria set forth in the guidelines for a dam having the above size and hazard potential. The spillways will pass 40 percent of the Probable Maximum Flood without overtopping. 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. The guidelines require that a dam of intermediate size with a significant downstream hazard potential pass 50 to 100 percent of the PMF. Considering the small height of the dam, the low storage capacity, and the short duration of permanent water impoundment, 50 percent of the PMF has been determined to be the appropriate spillway design flood. The 100-year flood (1 percent probability flood) will not overtop the dam. The 1 percent probability flood is one that has a 1 percent chance of being exceeded in any given year.