block
building
cement
cesspit
chamber
circle
circular
collector
combining
concrete
construction
culvert
department
ditch
drain
drainage
earthworks
engineering
equipment
factory
ferroconcrete
flue
gray
grey
industrial
industry
manhole
manufacturing
material
pipe
pit
plate
plumbing
produce
production
reservoir
ring
round
sanitary
section
septic
sewage
sewer
site
stack
strong
sump
tube
tunnel
warehouse