a deep narrow defile containing a mountain stream or torrent.

an artificial channel or trough for conducting water, as one used to transport logs or provide water power.

an amusement park ride in which passengers are carried in a boatlike or loglike conveyance through a narrow, water-filled chute or over a water slide.

to transport in a flume.

to divert (a stream) by a flume.

noun

channel , conduit , run , sluice , spillway