(n.) A sluiceway or passage for superfluous water in a reservoir, to prevent too great pressure on the dam.

aqueduct arroyo bed canal creek bed culvert donga dry bed flume gulch gully gullyhole headrace irrigation ditch nullah race river bed riverway runnel sluice spillbox stream bed streamway swash swash channel tailrace wadi water carrier water channel water furrow water gap water gate watercourse waterway waterworks