ABSTRACT
This chapter shows an automatic telescopic weir on the main entrance to a fishway adjacent to a spillway, and also shows how the lower baffles of the fishway are drowned out at high tailwater levels. The fishway is the answer to only one of the many problems created by the dam. This would apply in the case of a low dam on a stream populated with comparatively few fish. In general, as the number of migrating fish increases its effect on the physical environment increases and adds further complexity to all the problems created by the dam. Timber cribs are often used for cofferdams for river work, because they are easy to place by simply floating them to the site and sinking them, and are very easy to dismantle after they have served their purpose. The spillway extends across the dam from the powerhouse to the left bank, and is not serviced by a separate fishway.
