Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
National Dam Inspection Program. Hemlock Lake Dam (NDI I.D. PA 00571, PA DER 45-258). Delaware River Basin, Tributary of Pohopoco Creek, Pennsylvania. Phase I Inspection Program
Hemlock Lake Dam is an earth embankment about 450 feet long and 27 feet high. An ungated overflow spillway is located at the right abutment. A paved roadway has been constructed on the dam crest and a bridge has been constructed over the spillway. The dam was constructed in the early 1950's to provide a lake for recreational purposes. Hemlock Lake Dam has a maximum storage capacity of 117 acre-feet and a maximum height of 27 feet. The dam is classified as 'Small' size. Due to the potential for excessive property damage and the loss of more than a few lives in the damage center which consists of 5 houses with door sills as low as 5 feet above the stream bed located within 1,500 feet downstream of the dam, the structure classified as a 'High' hazard. Examination of the results of the hydrologic and hydraulic analyses indicates that the spillway is capable of passing approximately 26% of the Probable Maximum Flood (PMF) without the dam being overtopped. The selected Spillway Design Flood (SDF) for this 'Small' size, 'High' hazard potential structure is the PMF. The water surface elevation at the damage center is 2.4 feet higher for the breach condition than for the non-breach condition. The spillway is classified as 'Seriously Inadequate, Unsafe, Non-Emergency' since breaching of the dam significantly increases the downstream hazard potential. Based on visual observations and a review of the information obtained from the Pennsylvania Department of Environmental Resources (DER), Hemlock Lake Dam appears to be in poor condition.
National Dam Inspection Program. Hemlock Lake Dam (NDI I.D. PA 00571, PA DER 45-258). Delaware River Basin, Tributary of Pohopoco Creek, Pennsylvania. Phase I Inspection Program
Hemlock Lake Dam is an earth embankment about 450 feet long and 27 feet high. An ungated overflow spillway is located at the right abutment. A paved roadway has been constructed on the dam crest and a bridge has been constructed over the spillway. The dam was constructed in the early 1950's to provide a lake for recreational purposes. Hemlock Lake Dam has a maximum storage capacity of 117 acre-feet and a maximum height of 27 feet. The dam is classified as 'Small' size. Due to the potential for excessive property damage and the loss of more than a few lives in the damage center which consists of 5 houses with door sills as low as 5 feet above the stream bed located within 1,500 feet downstream of the dam, the structure classified as a 'High' hazard. Examination of the results of the hydrologic and hydraulic analyses indicates that the spillway is capable of passing approximately 26% of the Probable Maximum Flood (PMF) without the dam being overtopped. The selected Spillway Design Flood (SDF) for this 'Small' size, 'High' hazard potential structure is the PMF. The water surface elevation at the damage center is 2.4 feet higher for the breach condition than for the non-breach condition. The spillway is classified as 'Seriously Inadequate, Unsafe, Non-Emergency' since breaching of the dam significantly increases the downstream hazard potential. Based on visual observations and a review of the information obtained from the Pennsylvania Department of Environmental Resources (DER), Hemlock Lake Dam appears to be in poor condition.
National Dam Inspection Program. Hemlock Lake Dam (NDI I.D. PA 00571, PA DER 45-258). Delaware River Basin, Tributary of Pohopoco Creek, Pennsylvania. Phase I Inspection Program
P. C. Johnson (Autor:in)
1981
70 pages
Report
Keine Angabe
Englisch