Question

The Manning’s equation is used to describe the flow regime.

true or false

At a given specific energy (E) there are two possible flow depths.

true or false

Answer 1

1) False

The flow regimes are subcritical flow and super critical flow. When depth of water in the channel is greater than critical depth the flow is called as subcritical flow. When the depth of water in the channel is less than critical depth, the flow is called as supercritical flow. Froude number also defines the flow regimes, when froude number less than one subcritical flow and when the froude number greater than one supecritical flow.

2) True

The specific energy Es of a liquid in an open channel is the total mechanical energy (expressed as a head) relative to the bottom of the channel. At a given specific energy there are two possible flow depths and flow depths are called as alternate depths