機器
building material
building materials
cement
cog
cogs
concrete
dam
dams
flood defence
flood defences
floodbank
gear
gears
hydro electric
hydro electricity
hydro power
hydroelectric power
hydroelectrical
hydroelectricity
lake
lakes
levee
levees
lever
levers
machinery
machines
natural resource
natural resources
plant
plants
power and energy
railing
railings
renewable energy
reservoir
reservoirs
resource
resources
sluice gate
sluice gates
sluicegate
sluicegates
stopbank
sustainable energy
water
water management
weir