Hydraulics and Fluid Mechanics in ME
An orifice is said to be large, if

The available head of liquid is more than 5 times the height of orifice
The velocity of flow is large
The size of orifice is large
The available head of liquid is less than 5 times the height of orifice

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Hydraulics and Fluid Mechanics in ME
The specific speed of turbine is defined as the speed of a unit

Of such a size that it produces unit horse power with unit head
Of such a size that it requires unit power per unit head
Of such a size that it delivers unit discharge at unit power
Of such a size that it delivers unit discharge at unit head

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