A traveling water screen comprising an endless foraminous belt with flights.
The
foraminous belt forms a water screen extending from a lower end in a flowing stream
to an upper end above the surface of the stream. The stream flows through openings
in the foraminous screen. The flights, which may be scoops, are arranged in spaced
apart relation on the outer surface of the water screen. The water screen is driven
in a direction so that its upstream portion advances upward and its downstream
portion downward. The flights form inclined surfaces across the width of the screen
from a point of highest elevation to one or more points of lowest elevation at
one or both side edges of the screen. As the screen moves, the flights lift fish
toward the surface. As a flight breaks the surface, fish slide down the inclined
flights toward one or both side edges of the screen to be diverted safely. A second
water screen having larger openings than the fish-removal water screen can be positioned
upstream to filter out large debris and to protect the fish-removal water screen
from heavy impacts in a two-stage filter.