Underwater Work

Information about work performed under water to maintain dams and hydro facilities, such as dam inspection, dewatering, repairs and routine maintenance.

Underwater Work
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Latest Underwater Work News

Poland hydro operator seeks trashrake for 90-MW Dychow


Poland hydropower operator PGE Energia Odnawialna S.A. seeks bids to supply a trash rack cleaning system including crane for the 90-MW Dychow pumped-storage project on Poland's Bobr River.

Tech Briefs


IEEE releases two new hydroelectric standards

Preparation under way for fish passage at Oregon's 40-MW Foster hydropower plant


Divers from Vancouver-based Northwest Underwater Construction have been working on the face of Oregon's Foster Dam in preparation for a new Oregon Department of Fish and Wildlife facility.

Asset Management: Using ADCP-Based Flow Monitoring to Improve Operations at Niagara


Installation of a flow measurement system based on acoustic Doppler current profiler technology allowed the New York Power Authority to improve operational control of its Robert Moses and Lewiston hydroelectric plants.

Fish Passage: Positive Results from Fish Collection System at Round Butte Dam


Nearly 400,000 fish have migrated downstream past Round Butte Dam in Oregon since the beginning of 2010, indicating that the selective water withdrawal tower installed in the reservoir behind the dam in late 2009 has successfully restored fish passage from the Upper Deschutes River Basin.

Contract awarded for terrain modeling work for Georgia's Vardnili hydropower project


JV GeoEngineering/Hydrosphere of Georgia has been awarded a contract worth US$132,384 for topographic and bathymetric studies of waterways for the 245-MW Bardnili hydropower cascade.



Wayne Wright to retire from Chelan County PUD

The Leading Edge


Nova Scotia calls for increased tidal power output

U.S. seeks diving services at Troy Lock and Dam, New York


The U.S. Army Corps of Engineers seeks bids for diving services to inspect and remove debris at Troy Lock and Dam on the Hudson River in New York.

Underwater Solutions: Renovating a Landmark: Updating the Outlet Works at Cheeseman Dam

06/01/2011 Cheesman Dam and Reservoir, a major water supply for the City of Denver, was in need of new gates and grates. Global Diving & Salvage and Denver Water explain the strategy they used to repair the 106-year-old dam.

Dams & Civil Structures: A Challenging Gate Repair at Cowlitz Falls

07/01/2010 A sluice gate failure during a major 2006 flood causes revenue losses for Lewis County PUD and tests a team of engineers and workers, who put together a swift and creative plan to repair and close the gate in a short amount of time.

Underwater Solutions: Creating Safer Working Conditions, Better Results with a Diving Policy

06/01/2010 While development and implementation of a commercial diving policy has tripled American Electric Power's diving costs, the utility says the policy is necessary to ensure diver safety and quality work practices.


03/01/2010 Deep Ocean Engineering offers Vector T4, a new version of the company's Vector M5 remotely operated vehicle (ROV).

Fish Tracking: Technologies Grant County PUD Uses to Track Fish Movement

10/01/2009 Grant County Public Utility District uses three types of tags to track fish movement at its 855-MW Priest Rapids and 1,038-MW Wanapum projects on the Columbia River in Washington state.


10/01/2009 Dickson Company offers an online instrument selection guide at its website, www.dicksondata.com.

Barnard begins work to increase height of California's San Vicente Dam


Barnard Construction Co. began preliminary foundation work in June 2009 for a project to add 117 feet to the 220-foot-tall San Vicente Dam in Southern California, the world’s largest dam heightening project using roller-compacted concrete.

Dual-Axis Sonar: A New Tool for Underwater Surveys

03/01/2009 Dual-axis sonar technology uses sonar signals to provide a three-dimensional representation of submerged structures.

Acoustic Imaging and Profiling: A New Tool for Underwater Inspection

03/01/2009 Use of underwater acoustic imaging and profiling technology enabled the owner of the 50-year-old D’Arbonne Dam in north central Louisiana to pinpoint potential problems and make timely and cost-effective repairs.

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