Source : Webster's Revised Unabridged Dictionary (1913)

Sluiceway \Sluice"way`\, 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.

Source : WordNet®

sluiceway
     n : conduit that carries a rapid flow of water controlled by a
         sluicegate [syn: {sluice}, {penstock}]