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n. An artificial channel, especially one for carrying off excess water.

n. a man-made channel designed to redirect excess water

n. An artificial channel into which water is let by a sluice; specifically, a trough constructed over the bed of a stream, so that logs, lumber, or rubbish can be floated down to some convenient place of delivery.

n. An artificial passage or channel into which water is let by a sluice; hence, any small artificial channel for running water.

n. The opening in a splash-dam through which logs pass.

n. conduit that carries a rapid flow of water controlled by a sluicegate

"No sooner had the flow of liquor from Rum Row in the Northeast been stanched than it began to gush in unprecedented quantities through the sluiceway that was Detroit, where an overmatched prosecutor said, “The greatest obstacle to the attainment of Prohibition is the Constitution of the United States, the instrument that decreed its birth.”"

conduit   

sluice gate    sluice   

handspan    furrow-slice    roadway    crawlway    bordure