National Dam Safety Program. Harrisonville City Lake Dam (MO 20077), Missouri - Kansas City Basin, Cass County, 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. The inspection and evaluation indicates the spillway does not meet the criteria set forth in the guidelines for a dam having this size and hazard potential. The spillway will not pass the probable maximum flood without overtopping but will pass 85 percent of the probable maximum flood, which is greater than the estimated 100-year flood. The spillway design flood recommended by the guidelines is 100 percent of the probable maximum flood. 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 only significant deficiency visually observed by the inspection team was erosion of the upstream face of the embankment due to poor gradation of the riprap. Other deficiencies observed include erosion in the berm downstream of the embankment, small trees on the upstream face, minor seepage in the right abutment, spalling of concrete in the spillway discharge structure, and erosion around the discharge structure.