types of open channel flow
- The Froude number will be greater than one for supecritical flow and less than one for subcritical flow. slide 1 of 4. Types of Open Channel Flow Supercritical flow, subcritical flow, and critical flow are categories of open channel flow. Any open channel flow must be in one of these three categories. Supercritical flow is generally high flow velocity, shallow flow (less than critical depth) on a steep channel slope that has Froude number greater than one.