DTIC ADA097780: National Dam Inspection Program. Crystal pdf

DTIC ADA097780: National Dam Inspection Program. Crystal

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Description of the Book:

The purpose of the inspection is to determine if the dam constitutes a hazard to human life or property. Crystal Lake Dam is located on the headwaters of the Lehigh River in Lehigh Township, Wayne County, Pennsylvania. The overall appearance of the dam and appurtenant structures is fair. The toe of the dam and entire embankment are covered with brush and small trees, up to one inch in diameter, obscuring the slopes from view and making of visual inspection difficult. Accordingly, some deficiencies may have gone unnoticed. The embankment slopes are irregular and do not appear to have been constructed to any particular design template. Settlement of the embankment was observed on both sides of the spillway and adjacent to the corewall along the entire length of the dam. These low areas vary in depth from only a few inches to nearly three feet. Erosion all along the upstream slope was observed at, or near, the normal pool level which has resulted in a nearly vertical two-foot drop in the slope.

It is reported that riprap was placed on the slope during construction, although it was somewhat sparse in many places. There is very little riprap now remaining on the upstream slope

• Creator/s: Defense Technical Information Center
• Date: 1/1/1981
• Year: 1981
• Book Topics/Themes: DTIC Archive, , GANNETT FLEMING CORDDRY AND CARPENTER INC HARRISBURG PA, *EARTH DAMS, STABILITY, HYDROLOGY, DEFICIENCIES, SAFETY, VISUAL INSPECTION, FLOODING, RESERVOIRS, PENNSYLVANIA

An excerpt captured from the PDF book