Abstract: A diversion system for use in a watercourse for routing fish away from the intake, for example, of a hydroelectric plant. The system includes a plurality of upright screens arranged in zigzag fashion crosswise of the watercourse to provide a plurality of channels converging to outlets separate from the plant intake. The screens thus divert the fish and water-borne debris to the separate outlets while the main stream flows through the screens to the intake. Additionally, rotary sprayers are used to backwash the screens while in place from time to time to remove accumulated debris from the screens. The screens extend from the bottom of the watercourse to the water level while spanning the watercourse from one side wall to the other.

Abstract: A wet cleaning apparatus including a sealed container adapted to hold a liquid, such as water. A separator compartment is disposed within the container and has an open bottom extending into the liquid within the container. The air to be cleaned enters the compartment within the container and a liquid is sprayed on such air causing the solid particles therein to be wet and heavy and drop into the water therebelow. The air in the separator compartment exits through a venturi scrubber having a nozzle for spraying this air with liquid as it goes through the venturi opening, further wetting down any additional solid particles in the air and causing them to drop into the water in the container as the air leaves the separator compartment. The air in the compartment then flows above the liquid, around a baffle, through a pre-filter, through a high efficiency particulate air filter and out through an exhaust fan as clean, breathable air.