barrier
block
cement
civil
concrete
confine
conservation
construction
control
dam
electric
electrical
electricity
energy
engineering
environment
environmental
escape
flowing
gates
generate
generating
hydro
hydro electric
hydroelectric
hydropower
industrial
landmark
landscape
large
mountain
nature
obstruct
power
release
reservoir
resource
river
road
spillway
structure
technology
tower
valley
voltage
volts
wall
watts