assembling
background
building
chamber
column
construction
digging
disposal
ditch
drain
drainage
equipment
facility
ground
hole
house
household
industrial
industry
installation
manhole
montage
mounting
object
pipe
pipeline
pipes
pit
plumbing
pumping
rainwater
reconstruction
reinforcement
repair
sewage
sewer
sewerage
sewers
site
system
tank
treatment
trench
underground
waste
water