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“The lifts on the old Canal du Centre are a series of four hydraulic boat lifts. Along a particular 7 km (4.3 mi) stretch, the water level rises by 66.2 metres (217 ft). To overcome this difference, the 15.4-metre lift at Houdeng-Goegnies was opened in 1888, and the other three lifts, each with a 16.93 metres (55.5 ft) rise, opened in 1917.” More on Wikipedia.