National Dam Inspection Program. Zinc Dam. (NDI Number PA-00496, PennDER Number 63.7), Ohio River Basin, Branch of Burgetts Fork, Washington County, Pennsylvania. Phase I Inspection Report,
BAKER (MICHAEL) JR INC BEAVER PA
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Zinc Dam is a diaphragm earthfill embankment approximately 23 feet high and 410 feet long. The majority of the embankment materiel consist of low to medium plasticity clay CL. The buttressed concrete core wall, according to the design plan, is 4 feet below the design top of dam. The spillway, located 60 feet from the right abutment of the dam, is 50 feet long and 4 feet deep as originally designed. A mortared block wall was installed in the spillway which wave subsequently covered with earth, reducing the freeborad to as low as 0.4 foot. An analysis indicated that the spillway will pass only 5 percent of the PMF before overtopping will occur. Because of seepage through the embankment and evidence of overtopping of the embankment during a hazard review on 19 September 1979, the dam was considered to be in need of emergency attention. The pool was drawn down and the Phase I visual inspection was performed on 20 November 1979. The overall condition of the dam was very poor. It is recommended that the owner give consideration to breaching the dam as an alternate to performing the necessary repairs to the structure.
- Civil Engineering