英文關鍵字
bad
creek
culvert
day
dirt
dirty
ditch
drain
drainage
drainpipe
dump
ecology
engineering
environment
environmental
flow
flowing
fluid
garbage
hole
industrial
industry
infrastructure
liquid
outdoor
outside
overflow
pipe
pipeline
piping
pollutants
pollute
polluting
pollution
river
runoff
sewage
sewer
sewerage
smell
stormwater
stream
system
toxic
tube
tunnel
waste
wastewater
water
waterway