Description
This weir is the first weir from the estuary of Tama River, Tokyo, Japan. In this case, surface stones were settled on the downstream face of the weir, and air-concentration is occurred easily. The aerated flow leads many kinds of aquatic animals to the weir. In order that diadromous fishes, shrimps, and crabs can migrate to their upstream and downstream habitats, the settlement of the fishway is required.
Trapezoidal weir in Tama river
