Sonic Pulse Velocity Testing To Assess Condition Of A Concrete Dam

A velocity analysis was performed to assess the condition of a concrete arch dam. Sonic pulse<br>velocity (SPV) measurements were made at 28 locations along the dam by impacting the downstream<br>face and recording arrival times on the upstream face. The sonic energy was generating using a remotely<br>operated impact source specifically designed for the project that could be lowered from the dam crest.<br>The compressional wave energy was recorded using a string of hydrophones on the upstream face of the<br>dam. A tomographic analysis of the arrival time data was performed to generate cross sections at each<br>station to show the velocity distribution through the dam. An underwater inspection of the upstream face<br>provided the opportunity to correlate velocity anomalies with diver observations. The results of this<br>study will serve as a baseline for future assessments.