abysm abyss adolescent stream aqueduct arroyo beck bed bottom bottom glade bottoms bourn box canyon braided stream branch breach break brook brooklet burn canal canyon cavity channel chap chasm check chimney chink cleft cleuch clough col coulee couloir crack cranny creek creek bed crevasse crevice crick culvert cut cwm dale defile dell dike dingle ditch donga draw dry bed excavation fault fissure flaw flowing stream flume fluviation fracture fresh freshet furrow gap gape gash gill glen gorge groove grove gulch gulf gully gullyhole headrace hole incision intervale irrigation ditch joint kill kloof lazy stream leak lunar rill meandering stream midchannel midstream millstream moat moving road navigable river notch nullah opening pass passage race racing stream ravine rent rift rime river river bed riverway rivulet run rundle runlet runnel rupture scissure seam sike slit slot sluice spill stream spillbox spillway split strath stream stream action stream bed streamlet streamway subterranean river swash swash channel tailrace trench trough vale valley void water carrier water channel water furrow water gap water gate watercourse waterway waterworks