conduit

noun 0.655

tunnel

noun 0.617

storm sewer

noun 0.615

underpass

noun 0.613

aqueduct

noun 0.605

water tunnel

noun 0.599

drainpipe

noun 0.590

drainage pipe

noun 0.581

viaduct

noun 0.581

corridor

noun 0.574

sewer

noun 0.573

gutter

noun 0.572

couloir

noun 0.565

watercourse

noun 0.562

corvette

noun 0.560

pipe

noun 0.558

covered bridge

noun 0.557

culverin

noun 0.554

tub

noun 0.553

manhole

noun 0.549

overbridge

noun 0.543

burrow

noun 0.540

storm cellar

noun 0.540

causeway

noun 0.540

canal

noun 0.539

cut and cover

noun 0.536

downpipe

noun 0.536

coverb

noun 0.535

corral

noun 0.534

curvet

noun 0.534

tubule

noun 0.533

soil pipe

noun 0.533

colander

noun 0.532

trench

noun 0.532

gully

noun 0.531

coulee

noun 0.531

arch bridge

noun 0.531

cove

noun 0.530

sluice

noun 0.529

road bridge

noun 0.529

scupper

noun 0.528

convector

noun 0.527

cul-de-sac

noun 0.527

tube

noun 0.526

conveyor

noun 0.524

cloaca

noun 0.524

cesspool

noun 0.523

underground

noun 0.523

wireway

noun 0.522

drain

noun 0.522

funnel

noun 0.521

crawlway

noun 0.521

downspout

noun 0.521

water pipe

noun 0.521

cistern

noun 0.520

runnel

noun 0.520

guttering

noun 0.519

rivulet

noun 0.519

footbridge

noun 0.519

cylinder

noun 0.519

spillway

noun 0.518

bridge

noun 0.518

portcullis

noun 0.517

cavern

noun 0.517

undercroft

noun 0.516

corrin

noun 0.514

cur

noun 0.511

diverter

noun 0.511

cesspit

noun 0.509

traffic cone

noun 0.507

waste pipe

noun 0.506

pipe roll

noun 0.505

purlin

noun 0.505

ureter

noun 0.505

civil engineer

noun 0.504

ship canal

noun 0.504

curtain

noun 0.504

crevice

noun 0.504

covered way

noun 0.504

drawbridge

noun 0.503

carport

noun 0.503

souterrain

noun 0.502

corrie

noun 0.502

polytunnel

noun 0.501

penstock

noun 0.501