Gradually Varied Flow(GVF)

The Assumptions used while analyzing Gradually Varied flow(GVF)

A steady, non-uniform flow in which the depth of flow varies gradually along the length of the channel is called a gradually varied flow.
To analyze Gradually varied flow, the following assumptions are made:

1. Channel is a prismatic channel section and alignment remains the same.
2. Bed slope is small, i.e. So=Sf.
3. Energy loss is the same for a uniform flow at a section having the same velocity and hydraulic radius.
4. Energy correction factor a=1.
5. The roughness coefficient is independent of the depth of flow and constant throughout the channel.

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