ditch, canal, lock
渠 centers on an artificial water channel: a ditch, canal, or lock that controls water flow.
渠 combines 氵 (water) with a phonetic component historically derived from 巨, suggesting a large water channel. The lower 木 may be a later addition or simplification, but the exact development is uncertain.
Water 氵 flows through a giant 巨 wooden 木 structure: a canal or ditch with a lock.
For キョ, imagine a giant key unlocking a canal lock: key -> キョ, and the water flows through the ditch.
entering a dock
subterranean drain; culvert; conduit
dock
sewage pipe
dry dock
leaving the (repair) dock
drain with an oblong cross-section
combined sewer
open ditch
underdrainage
waterway; canal; river
chief of bandits
waterway; canal; river
ditch; sewer; canal
pipe (e.g. sewer, storm water); culvert
open ditch; open channel; open conduit; open culvert