Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
National Dam Safety Program. Lac Marseilles Dam (MO 30282), Mississippi - Kaskaskia - St. Louis Basin, St. Francois County, Missouri. Phase I Inspection Report
Lac Marseilles Dam is in the intermediate size classification based on its maximum height of 67 ft. Its reservoir storage volume is about 2400 ac-ft. The intermediate dam classification includes dams between 40 and 100 ft in height, or having storage capacities between 1000 and 50,000 ac ft. The inspection and evaluation indicate that the dam is in generally good condition. The slopes of the dam indicate no signs of any movement instability. There was no observed seepage through the dam with the water surface only a few feet below the spillway crest elevation. Our hydrologic analyses indicate that the existing spillway will safely pass the 100 year flood and 96 percent of the PMF. A flood event with the intensity of 100 percent of the PMF would only overtop a portion of the embankment by 0.1 ft for a period of less than 1 hour. Our analysis assumes that the existing 18-in. diameter pipe outlet facility is inoperative at the time of flooding. During overtopping, this pipe would, in any case, be capable of discharging only about 40 ft cub/sec. The crest of the dam is 50 ft wide, is traversed for its entire length by an asphalt-paved roadway and the materials on the downstream slope are not highly susceptible to erosion. The spillway discharge channel is underlain by bedrock at shallow depth, is located in a good position with respect to the main dam embankment and discharges the flow into a separate adjacent drainage valley.
National Dam Safety Program. Lac Marseilles Dam (MO 30282), Mississippi - Kaskaskia - St. Louis Basin, St. Francois County, Missouri. Phase I Inspection Report
Lac Marseilles Dam is in the intermediate size classification based on its maximum height of 67 ft. Its reservoir storage volume is about 2400 ac-ft. The intermediate dam classification includes dams between 40 and 100 ft in height, or having storage capacities between 1000 and 50,000 ac ft. The inspection and evaluation indicate that the dam is in generally good condition. The slopes of the dam indicate no signs of any movement instability. There was no observed seepage through the dam with the water surface only a few feet below the spillway crest elevation. Our hydrologic analyses indicate that the existing spillway will safely pass the 100 year flood and 96 percent of the PMF. A flood event with the intensity of 100 percent of the PMF would only overtop a portion of the embankment by 0.1 ft for a period of less than 1 hour. Our analysis assumes that the existing 18-in. diameter pipe outlet facility is inoperative at the time of flooding. During overtopping, this pipe would, in any case, be capable of discharging only about 40 ft cub/sec. The crest of the dam is 50 ft wide, is traversed for its entire length by an asphalt-paved roadway and the materials on the downstream slope are not highly susceptible to erosion. The spillway discharge channel is underlain by bedrock at shallow depth, is located in a good position with respect to the main dam embankment and discharges the flow into a separate adjacent drainage valley.
National Dam Safety Program. Lac Marseilles Dam (MO 30282), Mississippi - Kaskaskia - St. Louis Basin, St. Francois County, Missouri. Phase I Inspection Report
R. G. Berggreen (Autor:in) / L. M. Krazynski (Autor:in)
1981
89 pages
Report
Keine Angabe
Englisch