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Truncated triangular weir formula

TT1 caracterized by:

  • Cd: discharge coefficient
  • Zd: triangle's lower overflow elevation
  • Zt: triangle's higher overflow elevation
  • B/2: half-opening of the triangle

Formula

for ZamZt

Q=CdB2(ZtZd)(ZamZd)2.5

for Zam>Zt

Q=CdB2(ZtZd)((ZamZd)2.5(ZamZt)2.5)

Thin wall weir: Cd = 1.37

Thick weir without contraction (rounded r>0.1h1): Cd = 1.27

Triangular profile weir: (1/2 upstream, 1/2 or 1/5 downstream): Cd = 1.68 and 1.56