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 followed the Fonserannes Water Slope near Béziers on the Canal du Midi. Both water slopes run parallel to existing lock flights. Both water slopes are currently out of service and in disrepair. However, the constructions and the moving apparati can be viewed from a distance.
The water slope uses a moveable gate in a sloping channel. To ascend the slope the moving gate can be opened to allow a boat to enter the concrete channel. The gate then closes off the bottom of the channel and seals off a wedge of water on which the boat is floating, within the channel. The moveable gate is drawn up the sloping concrete channel pushing the wedge of water before it until reaching the upper water level. When the water level in the wedge is equalised with that of the upper canal, an upper (non-moving) gate is opened and the boat is then allowed to float free.
Descending the water slope is the reverse of the ascent.
- Tew, David (1984). Canal Inclines and Lifts. Sutton Books. ISBN 0-86299-031-9.
- Uhlemann, Hans-Joachim (2002). Canal lifts and inclines of the world (English Translation ed.). Internat. ISBN 0-9543181-1-0.
- Lance Day; Ian McNeil. Biographical Dictionary of the History of Technology.
- Ian McNeil. An Encyclopaedia of the history of technology.
- Hans-Joachim Uhlemann. Canal Lifts and Inclines of the World.
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