environmental
2019
background
blue
bridge
canal
christ
concrete
construction
contamination
culvert
dirty
discharge
drain
drainage
ecology
environment
february
feeding
flow
flowing
generation
industrial
industry
lisbon
metal
nature
old
pipe
pipeline
plant
pollution
portugal
portugal february
pouring
power
power station
river
sewage
sewer
station
stream
system
tagus
tagus river
tejo
treatment
tube
waste
water