n. In hydraulic engin., that part of the channel, conduit, or trough supplying water to a water-wheel which extends between the race and the gate through which the water flows to the wheel. It is generally made of planks or boards bound on the outside with stout timbers.n. A hydrant supplying water which is conveyed through a pipe from the source of supply.n. The barrel of a pump, in which the piston plays, and through which the water passes up.