PULSAR MEASUREMENT
99
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 4 P723
b = approach width P710
g = gravitational acceleration (nominal value = 980.66 cm/s
2
)
h = head
Ratiometric
If the flow calculation is to be ratiometric P702 = 2 the flow will be
calculated using the formula: q= q
cal
C
e
/C
ecal
(h
e
/h
ecal
)
1.5
Where:
q = flowrate
q
cal
= flowrate at maximum head P705
Ce = discharge coefficient calculated by Ultra 4 P723
Ce
cal
= discharge coefficient at maximum head
he = effective head
he
cal
= effective head at maximum head
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