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Calculates discharge of a flat v weir with backwater correction. The flow calculations are done using measurements taken at the weir.
The following formula is used:
Parameters:
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weir
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For h1 <= htr :
- Q = Cg . Cd . m . H1^(5/2)
- Cg = 4/5 sqrt(g)
- Cd = 0.615 for m <= 15
- Cd = 0.620 for 15 < m < 30
- Cd = 0.625 for m >= 30
- m = b/2htr
For h1 > htr :
- Q = Cg . Cd . m . (H1^(5/2) - (h1 - htr)^(5/2))
- Cd = 0.620 for m <= 15
- Cd = 0.625 for 15 < m < 30
- Cd = 0.630 for m >= 30
The modular limit is:
- for h1 <= htr h2/h1 = 0.70
- for h1 > htr h2/h1 = 0.75
If the modular limit is exceeded a missing value will be entered for the discharge.