Dam monitoring techniques
DOI link for Dam monitoring techniques
Dam monitoring techniques book
For a leaking dam, electrodes are placed upstream and downstream of the embankment or structure. The upstream electrode is placed in the reservoir water at sufficient distance from the dam to allow electric current to spread out in the reservoir before reaching the face of the structure. The downstream electrode is placed in strategic locations (seepages, observation wells, or other downstream locations) to facilitate contact with seepage flowing through the dam. The electrical current follows preferential pathways by concentrating in zones within the saturated subsurface that offer the least resistance through, beneath, and/or around the dam’s structure. As the electrical current takes various preferential flow paths through, beneath and/or around the dam, it generates a magnetic field characteristic of the electrical current. This unique magnetic field is identified and surveyed at the ground’s surface in a grid pattern using sensitive magnetic sensors.