National Dam Inspection Program. Broad Creek Dam (NDI-Number-MD-00017), Susquehana River Basin, Broad Creek, Harford County, Maryland. Phase I Inspection Report

摘要

Broad Creek Dam consists of an ogee shpaed concrete overflow spillway, 180 feet in length, with zoned earthen embankments 80 feet in length on the left side and 70 feet in length on the right side. The slope configuration is 2H to 1V, both upstream and downstream, and the maximum depth of fill is approximately 10 feet. A drain opening 4 feet by 4 feet, extends through the left side of the overflow section with the control structure and gate located on the downstream face. Based on the evaluation of the conditions as they existed on the date of the inspection and as revealed by visual observations, the condition of Broad Creek Dam is assessed to be good. The spillway capacity (50 percent PMF) is classified as inadequate because it will not pass the recommended spillway design flood of full Probable Maximum Flood (PMF) according to the recommended criteria. However, overtopping of the dam by PMF is judged not to cause a breach of sufficient magnitude to increase the loss of life downstream. Consequently, additional hydraulic studies and remedial work to increase spillway capacity are not necessary.