Abstract
This study deals with hydraulic characteristics for different weir types and effects on upstream migration of fish in a pool-weir fishway, and presents an optimal design of weir for an easy upstream migration. Experiments were performed to estimate hydraulic conditions for different weir types to determine the overall performance of the weir tested. The results showed that a rectangular weir with a notch installed in a straight configuration was preferable to one in a zigzag configuration or to a trapezoidal weir, since it made the flow stable and created a resting place for fish in the pool and thus made it possible for the upstream migration of fish.
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