Water channel may refer to:
- Strait, a naturally formed, narrow waterway
- Channel (geography), a landform consisting of the outline of the path of a narrow body of water</li>
- Canal, a man-made channel for water
- Aquaporin, a cellular membrane structure that selectively passes water
- An experimental tank
- Ship model basin, used in naval architecture to study the behaviour of sea vessels
- Water tunnel (hydrodynamic), used to study hydraulic flow
- Wave tank, a laboratory setup for observing the behavior of surface waves (also called: wave flume)
- Ripple tank, a shallow glass tank of water used in schools and colleges to demonstrate the basic properties of waves
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