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Specific Energy:
It is defined as energy per unit weight of the liquid with respect to the bottom of the channel. The extra information needed to solve the above problem can be provided by the specific energy equation.

**Specific Energy**

It is defined as energy per unit
weight of the liquid with respect to the bottom of the channel. The extra
information needed to solve the above problem can be provided by the specific
energy equation. Specific energy, Es, is defined as the energy of the flow with
reference to the channel bed as the datum:

Total
Energy on open channel flow

E= Z+y+ V^{2}/2g

Considering
the
bed as datum line , z=0

From Specific Energy curve , Corresponding to the Minimum specific energy E(min) ,there is
only one depth of floe that is called Critical depth.

**Critical Flow and Critical Velocity**

**Critical Flow**

Depth of flow of water at which
the specific energy. E is minimum is called as critical depth (yc). For
rectangular channel, critical depth,

**Critical Velocity**

Velocity of flow at the critical depth is called critical
velocity Vc

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civil : Applied Hydraulic Engineering: Uniform Flow : Applied Hydraulic Engineering: Specific Energy, Critical Flow and Critical Velocity |

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