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 channel.

Open Flow is an application that allows a user to calculate the dimensions of a specific channel type such as rectangular, triangular, trapezoidal, circular and parabolic. Also, it allows a user to calculate a channel's flow hydraulic properties such as flow capacity, flow width, flow depth, channel slope, Froude number and many others.