Hydraulics and Fluid Mechanics in ME
In open channels, the specific energy is the

Kinetic energy plotted above the free surface of water
Total energy measured above the horizontal datum
Total energy per unit discharge
Total energy measured with respect to the datum passing through the bottom of the channel

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Hydraulics and Fluid Mechanics in ME
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity
ratio of inertial force to force due to gravitation
ratio of inertial force to force due to viscosity
ratio of inertial force to force due to surface tension

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