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Triangular Weirs Flow Formula and Calculator

Fluids Engineering and Design
Civil Engineering and Design

Triangular Weirs Flow Formula and Calculator

Triangular weirs (V-notch weirs) should be used when small flow rates are to be measured. The flow coefficient over a triangular weir depends on the notch angle, θ, but generally varies from 0.58 to 0.61. For a 90° weir, C2 ≈ 0.593. (See Fig. 1.)

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Triangular Weirs
Fig. 1 - Triangular Weir

Eq. 1,
Q = C2 ( 8/15 tan(θ/2) ) (2g)0.5 H2.5

Eq. 2,
Q ≈ 1.4 H2.5 [90° weir]

Where:

C2 ≈ constant (0.593)
H = height of water (m)
θ = angle in degrees
Q = Flow m3/s
g = gavity 9.81 m/s2

Reference:

  • Civil Engineering Reference Manual, Fifteeth Edition

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