National Dam Safety Program. Duck Creek - State Wildlife Refuge - Pond 1 (MO 40063), Lower Mississippi - St. Francis Basin, Bollinger and Stoddard Counties, Missouri. Phase I Inspection Report

摘要

The purpose of the 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. This dam is classified as an intermediate size dam with a high downstream hazard potential. Failure could threaten the life and property of approximately 5 families at Idlewild, MO and 10 families at Kinder, MO as well as endanger traffic and disrupt transportation on Highway 51 immediately south of the Refuge. The inspection and evaluation indicate that the discharge system is adequate to meet the criteria set forth in the guidelines for a dam having the above mentioned size classification and hazard potential. According to the guidelines, the discharge system is required to pass the Probable Maximum Flood (PMF) without the dam embankment being overtopped. The PMF is defined as the flood discharge that may be expected from the most severe combination of critical meteorological and hydrologic conditions that are reasonably possible in the region. The discharge structures for Duck Creek will not pass the PMF nor the one-half PMF without overtopping. The PMF and one-half PMF will overtop the northern portion of the levee, however, no downstream hazard should result from this overtopping since the overtopped levee is only about 1.5 ft. as shown by levee section 'L' on Plate 5.