Fish Passage Planning and Design Prefabricated Fishways

Prefabricated Fishways

The College of Science and Engineering collaborates in fish passage planning and design with Walaman Fishways, which develops and markets prefabricated fishway products for waterway structures.

These prefabricated fishway components are suited for installation at culverts and other small waterway structures to overcome hydraulic barriers to fish migration, provide for aquatic fauna connectivity, and meet other multipurpose design requirements.

Walaman prefabricated fishway products are used in a number of different site configurations where fish migration barrier problems are to be overcome. For example, this can include road culverts with a drop at the outlet and high velocity zones within the culvert barrel, or small waterway structures such as weirs and grade control with water surface drops downstream of the structure.

The Walaman fishway components are manufactured under controlled conditions in the factory, and are installed within fishway facilities that are designed for the particular waterway structure and site characteristics.

A number of fishway types incorporating Walaman products are available for use. For example, the Block Ramp fishway is used to overcome water surface drop, and the Offset Baffle fishway provides for upstream fish passage in high velocity culvert zones. The EL Baffle fishway incorporates floor and wall mounted units for use in box culverts where fish passage is required in deeper flow conditions. Walaman fishways are also being developed for installation in pipe culverts.