[1][2] To date, only two water slopes have been built, both in southern France.
In 1973 the Montech water slope (French: Pente d'eau de Montech) was put into service on the Canal latéral à la Garonne.
In 1983 the Fonserannes Water Slope was inaugurated near Béziers on the Canal du Midi.
Both water slopes run parallel to existing lock flights.
To ascend the slope the moving gate can be opened to allow a boat to enter the concrete channel.