| canals(noun, sounds, lines, ways, courses) |
| ditches(noun, verb, lines, digs, removes) |
| grooves(noun, verb, lines, scores, directions) |
| gutters(noun, course, method, routine, lines) |
| conduits(noun, lines, ways, courses, drains) |
| ducts(noun, ways, courses, races, trails) |
| furrows(noun, verb, lines, scores, digs) |
| pipes(noun, verb, conduits) |
| gullies(noun, courses, grooves, drains, races) |
| trenches(noun, verb, lines, scores, removes) |
| troughs(noun, courses, flats, plains, bottoms) |
| aqueducts(noun, conduits) |
| courses(noun, conduits) |
| culverts(noun, conduits) |
| form(noun, style, plan, design, practice) |
| outlets(noun, releases, vents, entrances) |
| passages(noun, conduits) |
| ruts(noun, verb, grooves) |
| sewers(noun, ways, courses, races, trails) |
| flutes(noun, verb, grooves) |