| 摘要 |
<p>The present invention teaches a fish passage unit for providing a reduced flow rate of water having a chain drive system that is powered by the flow of water in the stream or river in which the unit is placed. In some embodiments, the chain drive system may be driven by the rotation of a waterwheel that is rotated by water from the stream flowing against the waterwheel. The chain drive system includes one or more catches that periodically contact a physical projection attached to each of the gates of the fish passage unit, thereby alternately and sequentially opening and closing the gates of the fish passage unit in order to control the flow of water through a passageway of the unit.</p> |
