The recently designed fishway shown here is an optimized Steeppass. It is under tide and sediment impact. The flow in the fishway is two-way: into the lake and out of the lake. The geometry optimization was achieved by OpenFOAM.

Fishway Design

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The interruption of connectivity of a natural river by the construction of a hydraulic structure must be properly compensated by a fishway for fish to migrate freely. A properly designed fishway will allow fish to swim into our lake, enhance our community, attract tourism and meet regulator's mandatory requirements.

A fishway may be under impact of strong flow currents, fluctuation of water levels due to tidal effect, and sedimentation and siltation in the fishway.

In general, there are four types of fishways: pool-and-weir fish ladder, vertical slot, Denil/Steeppass, and natural river passage.

A fishway needs to accommodate the local fish species with different swimming behaviors. Hydrodynamically, for fishway design, four factors need to be studied and optimized: dimensions, slope of the fishway, linkage of the entrance and outlet of the fishway to the vicinity structures, and relative layout location of the fishway in the entire hydraulic structure.

Presented here is an optimized Steeppass. It is under tide and sediment impact. The flow in the fishway is two-way: into the lake and out of the lake. The geometry optimization was achieved with OpenFOAM. The unique formation of the geometry streamlines favorable flowing patterns in the fishway and propels desired lower velocities near the water surface for fish migration and maximum velocities near the bottom for sediments auto-removal.

We are proud to be recognized as an industry leader in fishway design.

Contact: Meco (Mitchelmore Engineering Co. Ltd.)

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