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Calculates discharge of a triangular profile or Crump weir with backwater correction. The flow calculations are done using measurements taken at the weir.
The following formula is used:
Parameters:
- P = height of weir or height of vertex above bottom
- b = width of weir opening of width of triangle
- h1 = upstream water level
- H1 = upstream energy level
- h2 = downstream water level
Q = Cg . Cd . b . H1^(3/2)
Cg = sqrt(g)
Cd = 0.633
The modular limit h2/h1 = 0.75.
If this value is exceeded a missing value will be entered for the discharge. Further limiting conditions are:
P >= 0.06 m
b >= 0.30 m
h1/P <= 3
b/h1 >= 2