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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Page describing the calculation for the velocity of efflux, taking into account the velocity of approach.

Identifier  ExFiles\Box 36\1\  scan 016
Date  18th May 1936 guessed
  
-4-

Contd.

If the velocity of approach v is appreciable, the available pressure head must be increased by an amount v²/2g so that the velocity of efflux becomes

C_v √ (2gP/σ + v²)
  
  


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