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Author: United States. Army. Corps of Engineers. St. Louis District
Publisher:
Published: 1978
Total Pages: 62
ISBN-13:
DOWNLOAD EBOOK →Author: Arthur L. Johnson
Publisher:
Published: 1978
Total Pages: 40
ISBN-13:
DOWNLOAD EBOOK →This report assesses the general condition of the dam with respect to safety, based on available data and on visual inspection, to determine if the dam poses hazards to human life or property. The dam is in the high hazard potential classification, which means that loss of life and appreciable property loss could occur in the event of failure of the dam. For its size and hazard category, this dam is required by the guidelines to pass one-half PMF to the PMF. The spillway of this dam will pass only 20 percent of the PMF without overtopping the dam. Since the spillway for Sweetwater Dam is not capable of passing a minimum of one-half (50 percent) of the PMF without overtopping the dam, the spillway is considered inadequate. The inspection team observed heavy tree growth covering the downstream slope of the dam and spillways. Potential exists for other deficiencies such as rodent holes to be found after the trees and brush have been removed. The downstream slope of the dam was eroded considerably in the area of the right abutment where flow from the right spillway has occurred int he past. Seepage and stability analyses are not on record as recommended in the guidelines, which is considered a deficiency that should be rectified.
Author: Henry M. Reitz
Publisher:
Published: 1978
Total Pages: 47
ISBN-13:
DOWNLOAD EBOOK →Fon-du-lac Subdivision Dam was inspected by an interdisciplinary team of engineers. 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. Failure would threaten the life and property of ten families and cause appreciable damage to two county roads. Our inspection and evaluation indicates the dam is deficient in that the spillway is inadequate. The guidelines for a dam having the above size and hazard potential require that the spillway be capable of passing a one-half PMF (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 reasonably possible in the region. Considering the small volume of water impounded, the large floodplain downstream and the three groups of farm buildings downstream, one-half PMF is the appropriate spillway design flood. A 20% PMF will begin to overtop the dam. The lake and spillway are adequate to contain a 1% annual probability flood (100-year flood) without overtopping the dam.
Author: Arthur L. Johnson
Publisher:
Published: 1978
Total Pages: 58
ISBN-13:
DOWNLOAD EBOOK →The dam and lake are located on an unnamed tributary of La Barque Creek. The dam impounds water for the purpose of private recreation for surrounding residential property owners, who are members of the Lakewood Hills Property Owners Association. Major defects, including reconstruction of the upstream slope of the dam and sealing of the lake bottom, observed during this inspection are, according to the owner, planned to be corrected sometime this summer (1978) when a contract for remedial work on the dam and lake area is awarded. The remaining deficiencies observed during the inspection are not considered of major consequence to warrant immediate remedial action.
Author: Henry M. Reitz
Publisher:
Published: 1978
Total Pages: 48
ISBN-13:
DOWNLOAD EBOOK →No-Name 249 Dam was inspected by an interdisciplinary team of engineers. 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. Failure would threaten the life and property of four families and cause appreciable damage to associated buildings and one county road to the junction with an east-trending branch (3 miles) and 10 more families within one mile below the junction. Our inspection and evaluation indicates that the dam is deficient in that the spillway does not meet the criteria set forth in the guidelines for a dam having the above size and hazard potential. Considering the potential volume of water impounded, the narrow floodplain and the four groups of buildings downstream, and the potential for future development in or near the floodplain downstream, the Probable Maximum Flood (PMF) 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 meteorological and hydrologic conditions reasonably possible in the region. The dam will begin to be overtopped by a flood having a discharge (peak and volume) equal to 30% of the PMF. The spillway will pass a 1% chance flood (100-year flood) without overtopping which is a flood that has a 1% chance of being exceeded in any given year.
Author: Henry M. Reitz
Publisher:
Published: 1978
Total Pages: 51
ISBN-13:
DOWNLOAD EBOOK →This report assesses the general condition of the dam with respect to safety, based on available data and on visual inspection, to determine if the dam poses hazards to human life or property. This dam has been classified as unsafe, non-emergency by the St. Louis District as a result of the application of the following criteria: (1) Spillway will not pass 15 percent of the Probable Maximum Flood; (2) Overtopping could result in dam failure; and (3) DAm failure significantly increases the hazard to loss of life downstream.
Author: Ralph E. Sauthoff
Publisher:
Published: 1981
Total Pages: 69
ISBN-13:
DOWNLOAD EBOOK →This dam has been classified as unsafe, non-emergency by the St. Louis District as a result of the application of the following criteria: Spillways will not pass 50 percent of the Probable Maximum Flood without overtopping the dam; Overtopping of the dam could result in failure of the dam; and Dam failure significantly increases the hazard to loss of life downstream.
Author: Henry M. Reitz
Publisher:
Published: 1978
Total Pages: 52
ISBN-13:
DOWNLOAD EBOOK →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 to determine if the dam poses hazards to human life or property. The inspection and evaluation indicates that the dam is deficient in that the spillways do not meet the criteria set forth in the guidelines for a dam having the above size and hazard potential. Considering the volume of water impounded, the floodplain downstream and potential residential development downstream, the Probable Maximum Flood (PMF) 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 meteorological and hydrologic conditions reasonably possible in the region. The dam will begin to be overtopped by a flood having a discharge (peak and volume) equal to 50% of the PMF. The spillways will pass 1% chance flood (100-year flood) without overtopping, which is a flood that has a 1% chance of being equalled or exceeded in any given year. There were indications of seepage or underseepage through or under the dam embankment. This is a serious safety deficiency which could lead to failure of the embankment.
