The mission consists in surveying all submerged parts of the dam: the wall and seals between concrete blocks, the water inlet, sluice gates, bottom outlet…It used to be done by draining the whole reservoir prior to a visual inspection, but when reliable ROV were available, it appeared to be far less expensive and safer for the dam structure to do it using a ROV equipped with a video camera (and now also acoustic camera). The positionning system is then necessary for the ROV navigation, especially in case of poor visibility, and to offer a traceability of all measurements and recordings.
PLSM works in close cooperation with ROV companies and offers its equipments for sale or rent, as well as a full technical assistance including the equipment and personnel to operate it.
Sample of dam survey result in a narrow canyon (french Alpes)
Dam Survey by ROV
The ROV trace and current location, as well as the model of the dam are displayed
in 3D using the BricsCad software (dwg compatible, interfaced to AQUA-
Vidéo of a dam survey:
(Made by JIFMAR company, using PLSM’s RTKDuo system)