National Dam Safety Program. Rock Island Lake Dam (MO 20182), Missouri - Kansas City Basin, Johnson County, Missouri. Phase I Inspection Report.
BLACK AND VEATCH KANSAS CITY MO
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Rock Island Lake Dam was inspected 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 the spillway does meet the criteria set forth in the guidelines for a dam having the above size and hazard potential. The spillway design flood recommended by the guidelines is 50 to 100 percent of the probable maximum flood. The spillway will not pass the probable maximum flood without overtopping but will pass 55 percent of the probable maximum flood. The spillway will pass the 100-year flood. Considering the small volume of water impounded by the dam and the downstream hazard, 50 percent of the probable maximum flood is the appropriate spillway design 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. Deficiencies visually observed by the inspection team were undermining of the spillway, cracks in the spillway walls, the presence of excessive brush and trees on the embankment slopes, animal burrows in the embankment slopes, erosion on the embankment slopes, and the displacement of the ballast material along the crest of the embankment. Seepage and stability analyses required by the guidelines were not available.
- Hydrology, Limnology and Potamology
- Civil Engineering