Source: The Great Interpretation of Dreams (Ibn Sirin)
A channel in a dream indicates sustenance that flows through a man. The flow of water in it indicates the continuity of sustenance.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A channel indicates a servant or a partner. Clear water in it indicates the righteousness of the servant.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A channel is interpreted as goodness and benefit. Whoever sees himself drinking from it will attain goodness.