Bs-3680 Thin Plate Rectangular Weir, P3 = 6 - Siemens OCM III Instruction Manual

BS-3680 THIN PLATE RECTANGULAR WEIR, P3 = 6

'U' parameters required *
U0 = approach width
U1 = crest width
U2 = crest height
*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:
q = Ce x ⁄ √ ⎯ ⎯ ⎯ 2 g x be x ( h
2
3
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 Ce/Ce x (h/h
cal cal
where : q = flow rate
q = flow rate at maximum head
cal
h = head
h = maximum head
cal
Ce = discharge coefficient for head
Cv = discharge coefficient for maximum head
cal
¤
Refer to Operation \ Flow Calculation.
7ML19985AB01
B
b
p
¤
1.5
)
e
¤
1.5
)
cal
OCM III
'U' parameters calculated **
U3 = Ce
U4 = K
b
Ce = a function of h, p, b and B
be = effective crest width (b + K
h = effective head (h + K
e
K = 1 mm
h
)
b
)
h
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