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{{expert needed|1=Fluid
'''Open-channel flow''', a branch of [[hydraulics]] and [[fluid mechanics]], is a type of [[liquid]] flow within a conduit with a free surface, known as a [[Stream channel|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: the free surface. Open-channel flow has a [[free surface]], whereas pipe flow does not.
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