OBJECTIVE PLEASE ANSWER NUMBER $56$This phenomenon is formed only if the depth of flow is forced from a depth lower cal depth to another depth higher $($subcritical$)$ than the critical depth.

e character of a non$-$uniform flow is often classified in terms of the actual channel slope, sob, companted sir lope required to produce uniform critical flow, SOC. This type of flow also depends on whether the fluits the than or greater than the uniform normal depth.