box
box culvert
cement
channel
concrete
construction
conveyance
culvert
discharge
drain
drainage
drains
duct
engineering
flow
gully
highway
inside
large
outdoor
outdoors
outlet
passage
pipe
precast
reinforced
road
roads
roadway
route
runoff
storm water
stormwater
stream
structure
surface
transportation
tube
tunnel
under
water
waterway