Bs-3680 Finite Crest Weir, P3 = 5 - Siemens OCM III Instruction Manual

BS-3680 FINITE CREST WEIR, P3 = 5

'U' parameters required *
U0 = crest width
U1 = crest height
U2 = crest length
*
obtain from manufacturer's specifications.
**
calculated by OCM-3. May be viewed by accessing 'U' parameter.
Reference
ABSOLUTE CALCULATION, P4 = 0
For flows that can be calculated by the equation:
1.5 0.5
q = (2/3) x g x C x Cp x b x h
where : q = flow rate
g = gravitational acceleration
b = crest width
h = head
RATIOMETRIC CALCULATION, P4 = 1
For flows that can be calculated by the equation:
q = q x C/C x Cp/Cp
cal cal
where : q = flow rate
q = flow rate at maximum head
cal
h = head
h = maximum head
cal
C = discharge coefficient for head
C = discharge coefficient for maximum head
cal
Cp = correction factor for C
Cp = correction factor for C
cal
¤
Refer to Operation \ Flow Calculation.
7ML19985AB01
b
p
L
¤
1.5
¤
1.5
x (h/h )
cal cal
cal
OCM III
'U' parameters calculated **
U3 = C
U4 = Cp
C = a function of h and L
Cp = a correction factor as a function
of h and p applied to C
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