Siemens OCM III, Instruction Manual, Page: 83 / 112

TRAPEZOIDAL AREA X VELOCITY, P3 = 14
‘U’ parameters required * ‘U’ parameters calculated **
U0 = channel top width B U3 = area (h)
U1 = channel base width b
U2 = channel depth ht
*
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 = 1/1000 x (b + mh) x v
m = (B - b)/d
where : q = flow rate, l/sec
B = channel top width, cm
b = channel bottom width, cm
d = depth of channel, cm
h = head, cm
v = flow velocity, cm/sec
RATIOMETRIC CALCULATION, P4 = 1
¤
For flows that can be calculated by the equation:
q = q
cal
x A/A
cal
x v/v
cal
A = (b + mh) x h
A
cal
= (b + mh
cal
) x h
cal
m = (B - b)/d
where : q = flow rate, l/sec
B = channel top width, cm
b = channel bottom width, cm
d = depth of channel, cm
h = head, cm
v = flow velocity, cm/sec
¤
Refer to Operation \ Flow Calculation.
7ML19985AB01 OCM III 84