Bs-3680 Round Nose Horizontal Crest Weir, P3 = 2 - Siemens OCM III Instruction Manual

BS-3680 Round Nose Horizontal Crest Weir, P3 = 2

'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 Cv x Cs x Cd x b x h
where : q = flow rate
g = gravitational acceleration
b = throat width
h = head
RATIOMETRIC CALCULATION, P4 = 1
For flows that can be calculated by the equation:
q = q x Cd/Cd x Cv/Cv
cal cal
where : q = flow rate
q = flow rate at maximum head
cal
h = head
h = maximum head
cal
Cv = velocity coefficient
Cv = velocity coefficient for maximum head
cal
Cd = discharge coefficient for head
Cd = discharge coefficient for maximum head
cal
¤
Refer to Operation \ Flow Calculation.
7ML19985AB01
b
p
L
¤
1.5
¤
1.5
x (h/h )
cal cal
OCM III
'U' parameters calculated **
U3 = Cv
U4 = Cd
U5 = A
Cv = velocity coefficient
Cs = shape coefficient
Cd = discharge coefficient
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