Definitions for "Velocity Head"
The energy of a fluid which is in motion. Also the potential energy needed in order to create fluid velocity.
The energy required to attain a certain velocity. The higher the velocity the greater the velocity head. Velocity head is usually insignificant in most landscape irrigation applications, but should be calculated where low pressure and high velocities occur.
For water moving at a given velocity, the equivalent head through which it would have to fall by gravity to acquire the same velocity.