Fish Pass Construction

Throughout many cities in the UK, one of the legacies of the industrial past is the presence of old weirs, constructed in order to provide a head of water to mills and factories.

One such weir is on the Kirklees Brook, a tributary of the River Irwell. Following the outline and detailed design of a fish pass at the weir (carried out by the Fishtek team), a fish pass was installed at the site. This was a ‘hybrid’ fish pass, composed of a small Larinier fish pass, with a series of fabricated pre-barrages downstream.

Both the Larinier fish pass and the pre-barrages were fabricated by Fishtek. The Larinier pass was designed to be largely self-supporting and was fabricated in sections, with large flange joints to help support the structure.

The installation of this fish pass has made a barrier passable that has been a complete barrier to fish migration for over 200 years.