ULTRA 3 INSTRUCTION MANUAL
92
BS3680 Rectangular Broad Crested Weir
Point of Measurement
The transducer must be above the maximum head P704 by at least the
near blanking distance P107.
The head is measured at a point 3 to 4 times the maximum head upstream
from the weir crest, to ensure the surface of the liquid is not affected by
turbulence or drawdown.
Rectangular Broad Crested Weir Calculations
Calculations
Absolute
If the flow calculation is to be absolute P702 = 1 the flow will be calculated
using the formula: q = (2/3)
1.5
C
e
b(gh
3
)
0.5
Where:
q = flowrate
Ce = discharge coefficient calculated by Ultra 3 P723
b = approach width P710
g = gravitational acceleration (nominal value = 980.66 cm/s
2
)
h = head
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