Open-channel flow - Wikipedia
https://en.wikipedia.org/wiki/Open-channel_flow
OverviewClassifications of flowStates of flowSee alsoFurther readingExternal linksIn fluid mechanics and hydraulics, open-channel flow is a type of liquid flow within a conduit with a free surface, known as a channel. The other type of flow within a conduit is pipe flow. These two types of flow are similar in many ways but differ in one important respect: open-channel flow has a free surface, whereas pipe flow does not, resulting in flow dominated by gravity but not hydraulic pressure.
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