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Tuesday, February 10, 2009

design : v notch for flow measurement

To design a V notch for measurement of flow, We first will have to build a chamber to install the V notch.
 
The size of the chamber  will depend on the quantity of total discharge to be estimated.
 
After knowing the cross sectinal size of the chamber, the size and thickness of the V notch plate can be determined.
 
 

Installation Guidelines for V notch

 

 

 

 

  • Use a 2mm Thick Mild Steel plate to make the V notch. Make a 90o V
  • Water surface downstream of the weir should be at least 6 cm below the bottom of the V to allow a free flowing waterfall.
  • The bottom of the "V" only needs to be 10 cm (=P) above the bottom of the upstream channel,
  • the approach channel (=B) only needs to be 2 ft. wide,
  • Head (h) should be measured at a distance of at least 4h upstream of the weir.

 

Q = 4.28 C tan(θ/2)( h+k)5/2

 

where
Q = flow rate (cfs)
C= Discharge Coefficient, C=0.578 for 90o V notch
θ = v-notch angle ( 90o
h = head on the weir (ft)
k = Head Correction factor(Ft)
  • k (ft.) = 0.0144902648 - 0.00033955535 Ø + 3.29819003x10-6 Ø2 - 1.06215442x10-8 Ø3
    where Ø is the V notch angle in degrees ( 90o

 

 

Source: ENVO PROJECTS. NEW DELHI-25 9899300371, 9810004529

 

1 comment:

urgent said...

is it necessary to keep height 'P' in design of V-notch? will it affect the discharge if the value of 'P' is zero at upstream. this V-notch will be used to measure the seepage discharge in dam.