Case Study

Submersible Pumping Technology To Provide Safe Fish Passage

Source: Flygt -- A Xylem Brand
Submersible Pumping Technology To Provide Safe Fish Passage

The Rocky Reach Dam, with its colorful flowerbeds, visitor’s center and historical and technical museum, is the most significant environmental force in the Pacific Northwest, providing recreation, fishing, and irrigation. Because of the steep drop from its origin to its mouth, it also is one of the greatest sources of hydroelectric power in the world. To help salmon and trout return from the ocean to their native streams to spawn, the dams have long operated fish “ladders” – gradually stepped-up watercourses that help the fish get around the massive vertical dams.

To protect fish without losing valuable power, the operator at Rocky Reach Dam constructed a bypass powered by 29 pumps. Flygt has designed a record-breaking and industry-leading custom pump for this unique application. This design results in the most efficient creation of the fish attraction flow required.