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Velocity of approach in fluid mechanics, velocity of approach in notch, velocity of approach in weir, maximum approach velocity.

 Velocity of approach:-

                               Velocity of approach is defined as ther velocity with which the water approaches or reaches ther weir or notch before it flows over it.  
Velocity of approach in fluid mechanics, velocity of approach in notch, velocity of approach in weir, maximum approach velocity.


  • Thus if Va is the velocity of approach, then an additional head ha equal to Va^2/2g due to velocity if approach, is acting on the water flowing over the notch. 
  • Then initial height of water over ther notch become (H + ha ) and ther final height becomes equal to ha.
  • Then all the formulae are changed taking into consideration of velocity of approach. 


             Va = Q/ Area of channel
Discharge over a rectangular weir, with the velocity of approach. 

= 2/3 × Cd × L × (2g)^1/2 × [( H1 + ha )^3/2 ha^3/2].

 ☆  ha= Va^2/ 2g.

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