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When drilling in dams, how does the drilling with water-powered technology influence the formation?

Answer:

The method is based on water at a pressure of up to 180 bar (in competent rock), powering the DTH hammer that is mounted on the drill bit. When the water leaves the hammer it has a sufficient velocity (0.5 – 2 m/s) to bring the cuttings and debris to the surface and clean the hole.