BS-3680 THIN PLATE V-NOTCH WEIR, P3 = 7
‘U’ parameters required * ‘U’ parameters calculated **
U0 = notch angle alpha U1 = Ce
*
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 8/15 x tan(
α
/2) x (2g)
0.5
x h
2.5
where : q = flow rate h = head
g = gravitational acceleration Ce = function of h and
α
α
= notch angle alpha
◊
◊
angle is restricted to 90°, 53.133° or 28.066°. Otherwise use ratiometric calculation.
RATIOMETRIC CALCULATION, P4 = 1
¤
For flows that can be calculated by the equation:
q = q
cal
x Ce/Ce
cal
x (h/h
cal
)
2.5
where : q = flow rate
q
cal
= flow rate at maximum head
h = head
h
cal
= maximum head
Ce = discharge coefficient for head
Ce
cal
= discharge coefficient for maximum head
¤
Refer to Operation \ Flow Calculation.
7ML19985AB01 OCM III 70
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