architecture
barrier
building
canal
cascade
channel
city
concrete
construction
dam
dirt
disaster
engineering
environment
flood
flood gate
floodgate
flow
flowing
gate
gateway
hydro
hydroelectric
hydropower
industry
landmark
lock
nature
old
outdoors
pollution
regulate
reservoir
river
sluice
sluice gate
sluicegate
station
stone
stream
structure
technology
view
wall
water
waterfall
watergate
weir