Milltronics OCM II PL-269, Instruction Manual

Page: 57 / 107

P2=7 COMPOUND EXPONENTIAL DEVICES
U0 = Q
cal
The flowrate at full head
enter: [values from specs.]
U1 = t
cal
The time units of Q
cal
enter: [0] per second
[1] per minute
[2] per hour
[3] per day
U2 = h
cal
The head at which Q
cal
occurs
enter: [value from specs.]
U3 = A Coefficient of the 1st exponential term
enter: [value from specs.]
U4 = B Coefficient of the 2nd exponential term
enter: [value from specs.]
Flowrate is given by: Q = Q
cal
x (A x h
1.5
+ B x h
2.5
)
(A x h
cal1.5 + B x hcal2.5)
Example for the thin plate rectangular notch weir where
Q = 3.33 (L-0.2h)h
1.5
A = L (same units as in P0)
B = -0.2
PL-269 7 – 29