Trompe

At Canadian Hydro Developers' Ragged Chute facility in New Liskeard, Ontario, water falls down a shaft 351 feet (107 m) deep and 9 ft (2.7 m) across to generate compressed air for mining equipment and ventilation.

The energy of the falling water creates a partial vacuum inside the pipe that is compensated by the air from the outside atmosphere provided through inlet.

The pressure of the air delivered cannot exceed the hydraulic head of the discharge pipe of the separation chamber.

The Ragged Chute plant on the Montreal River near the town of Cobalt, Ontario, is a trompe and tourist attraction.

Today, trompes constructed of plastic pipe are being used to provide aeration for mine drainage treatment.