anti
brown
canal
channel
concrete
contaminated
creek
culvert
dirty
discharge
ditch
drain
drainage
dump
engineered
environment
environmental
flow
flowing
garbage
green
industrial
industry
outfall
outflow
outlet
overflow
pipe
piping
plumbing
pollutants
pollution
rainwater
rust
rusty
sanitary
sewage
stagnant
storm
stream
toxic
treatment
tube
tunnel
underground
untreated
waste
wastewater
water
works
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