WordNet
water chute
n. chute with flowing water down which toboggans and tubes and people slide into a pool
Usage examples of "water chute".
They neared the foot of the mountain and the creek ascended sharply, turning into a very narrow gorge that obviously would be a treacherous and impassable white water chute in the months the creek wasn't frozen.
At the back of the passenger cabin was a slide like a water chute, down which the parachutists would glide into space.
Victor watched Matthew slide down the water chute along one side, nearly landing on top of the excited animal.
The deck seemed to be slanting away to the stern like a water chute.