尾水渠道

outflow channel

tail / remainder / remnant / extremity / sixth of the 28 constellations / classifier for fish

horse's tail / pointed posterior section of a locust etc

tailwater / outflow (from mill or power plant)

surname Shui

water / river / liquid / beverage / additional charges or income / (of clothes) classifier for number of washes

canal

surname Qu

how can it be that?

big / stream or canal / drain / ditch / CL:條|条[tiao2] / him (dialect) / outer rim of a carriage wheel (old)

irrigation ditch / (fig.) channel / means

road / path / CL:條|条[tiao2],股[gu3] / principle / truth / morality / reason / skill / method / Dao (of Daoism) / to say / to speak / to talk / classifier for long thin things (rivers, cracks etc), barriers (walls, doors etc), questions (in an exam etc), commands, courses in a meal, steps in a process / (old) circuit (administrative division)