aerial
archgravity
ardennes
artificial lake
barrage
belgian
belgium
dam
day
drinking
drinking water
electrical
electricity
energy
engineering
footpath
forest
generator
gileppe
gravity
hydroelectric
hydroelectricity
jalhay
lake
landmark
landscape
liege
lion
massive
monument
plant
power
province
renewable
reservoir
retaining reservoir
river
sculpture
supply
supplying
technology
turbine
two
verviers
view
wallonia
water
weir
well
wood