Underwater inspection of the Mamakan Hydroelectric Power Plant structures

In June 2015, the underwater structures of Mamakan Hydroelectric Power Plant were inspected using a Reson SeaBat 7125 SV2 multibeam system with an Ixsea Octans motion sensor and gyrocompass. Real-time kinematic positioning provided centimetre-level horizontal and vertical positioning.

The transducer was rotated by 30 degrees to improve coverage of submerged vertical walls. Adjustable sonar coverage directed all 512 beams towards the inspected surface, providing a dense point cloud for identifying and recording defects, damage and deformation.