'''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.
An open channel is passage which conveys water at atmospheric pressure under the influence of gravitational force in the other words which is conduilt in which water flows with the surface in contact with the atmosphere flow irrigation, channels, streams and rivers navigation channel drainage channels on some examples of open channel flow as the liquid flow in which channel it will always be subjected to some fictional resistance in order to overcome the resistance and its cause the floor in the channel is considered with the bottom looking towards the direction the flow in challenge it is constructed with its water flowing towards the direction of flow the flow of liquid through a pipe of atmospheric pressure or when the level of the liquid in the 50 the top of the classified as a open channel flow
