flume

باللغة العربية: مَجْرًى مَائِيّ، قَنَاة مَائِيَّة خَشَبِيَّة

1. A ravine or gorge, usually one with water running through.
2. An open channel or trough used to direct or divert liquids, especially to carry materials (logs, mined material, etc) or people (as a water slide), especially (but not always) one where the walls are raised above the surrounding terrain rather than recessed like a ditch.

الجمع flumes