active
bank
barrage
big
border
bridge
building
canal
clean
concrete
construction
dirty
empty
environment
factory
far
flap
flood
floodgate
flow
framework
gate
green
industry
lake
lock
plant
pole
pool
port
reflection
river
rusty
sluice
steel
storage
stream
symbol
symbolic
tank
tower
transport
transportation
travel
tree
water
watergate
working