Open channel flow describes cases where flowing liquid has a top surface open to the air ; the cross-section of the flow is only determined by the shape of the channel on the lower side .
Is variable depending on the depth of liquid in the channel .
Open channel flow describes cases where flowing liquid has a top surface open to the air ; the cross-section of the flow is only determined by the shape of the channel on the lower side , and is variable depending on the depth of liquid in the channel .