In an effort to help juvenile salmon negotiate a safer bypass route around the hydroelectric dams around the Columbia and Snake Rivers in the Pacific Northwest of the U.S., a unique 10x3 pump array will be used to draw water through a fish attraction channel and recirculate it into the headwater above the dam.

A section of the array of Flygt's P7900 ultra low head pumps

A wall vortex generated by a single pump in the full size prototype test rig in Pewaukee, Wisconsin.
Courtesy of ITT Flygt