Flow Velocity: The Chézy Formulation
Open-channel flow velocity is proportional to shear velocity.
Learning Goals
- Relate flow velocity to shear velocity via the Chézy Formula.
- Understand its relationship to flow depth and the eventual reframing of the Chézy coefficient by Manning to take flow depth into account.
The formula
For quick reference; see course notes and video for derivation:
\[\bar{u} = C_z u_\tau\]For steady, uniform flow:
\[\bar{u} = C_z \sqrt{g h S}\]Course notes
Chézy’s formula explained
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