Abstract
Experimental laboratory studies were conducted on a fishway of pool type. The fishway consists of three parts. The upstream and the downstream parts of the fishway are built of X-type concrete blocks and form stilling basins for fishes to rest. The middle part of it is built of mountain-type concrete blocks and is designed to guide fishes. The design water depth of the inlet of the fishway is 20cm. The scale of the hydraulic model is 1:27 to proto-type and the law of similitude of Froude is applied to the experiment. Water depth and velocity distributions are measured, and the flow conditions are examined to clarify whether ayu are able to migrate upstream via the fishway or not.
