National Dam Inspection Program. Doverspike Number 1 Dam (NDI ID PA-01131, DER ID 33-56). Ohio River Basin, Cherry Run, Jefferson County, Pennsylvania. Phase I Inspection Report,
D'APPOLONIA CONSULTING ENGINEERS INC PITTSBURGH PA
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Based on the evaluation of the existing conditions, the condition of Doverspike No. 1 Dam is considered to be poor due to the inadequate size of the emergency spillway discharge channel. Field observations indicate that the capacity of the discharge channel is significantly less than the capacity of the emergency spillway overflow section, and a major portion of the flow passing the control section would spill onto the embankment, posing a potential for erosion of the embankment. The condition of the embankment is considered to be good. According to the recommended criteria, intermediate size dams in the high hazard category are required to pass full probable maximum flood PMF without overtopping the embankment. The flood discharge capacity was evaluated according to the recommended criteria and was found to pass about 30 percent of the PMF without overtopping the embankment. Therefore, the spillway capacity is rated to be inadequate. Because overtopping of the embankment during the passage of 50 percent of the PMF for a duration of 3.2 hours with a maximum depth of 0.4 foot is not considered to present a serious breach potential, the spillway is not considered to be seriously inadequate.
- Civil Engineering