canal
chemical
concrete
corrosion
danger
day
dirty
disaster
dump
ecology
environment
factory
fatal
flowing
garbage
global
harm
industrial
industry
influence
interior
liquid
natural
nature
old
outdoors
pipe
pipeline
pollution
pool
power
problems
refinery
rusty
scene
sewage
sewer
stream
substance
technology
toxic
tube
unhygienic
urban
view
warming
waste
water
waterfall
withdrawal