Ontario Power Generation (OPG) is introducing new technology to improve underwater surveys at its hydroelectric facilities.
The utility is now using an uncrewed surface vessel (USV) called the Otter. The 62kg vessel, which arrived at OPG’s Central Civil Engineering office this spring, is designed to map underwater features at dams and generating stations.
The 2m by 1m vessel is equipped with a Multibeam Echosounder sonar system. This technology allows it to complete high-resolution hydrographic surveys, creating detailed models of river and lake beds. The data helps OPG predict water flows, assess dam capacity during extreme weather events, and support dam safety.
The Otter is also being used in environmental monitoring, such as identifying fish spawning areas and tracking erosion.
Until now, OPG relied on crewed boats for bathymetric surveys. These surveys were effective but limited by safety concerns, the need for deeper water, and access to boat launches. The Otter can be launched by hand and operate in areas that were previously unsafe or inaccessible. By removing the need for workers to be on the water, it also improves safety, the company said.
The vessel has already been deployed at several OPG sites, including Lower Notch, Calabogie, Barrett Chute, Elliot Chute, DeCew Falls I, Little Long, and the Adam Creek sluiceway. OPG plans to expand its use to additional facilities in the coming months, including DeCew Falls II, Alexander, and Bark Lake Dam.
