Supervision

Viira Fish Pass

Construction of an artificial rapid and fish passage at Viira in 2015.

Project overview

In 2015, an artificial rapid was created across the full width of the river at the location of the former dam. The rapid is about 18 m long and about 11 m wide, with a fall of 0.7 m, or 3.8%. The lower layer consists of boulders and crushed stone covered with geotextile. Larger boulders with diameters from 100 to 1100 mm were placed on the textile in a checkerboard pattern, and the surrounding areas were covered with a 0.2 to 0.4 m layer of smaller stones. To allow canoeists to pass, a deeper and more evenly graded channel approximately 2 m wide was formed along the right bank of the river.

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