Siemens 7ML19985AB01 instruction manual Cv = velocity coefficient

BS-3680 TRAPEZOIDAL FLUME, P3 = 3
‘U’ parameters required *			‘U’ parameters calculated **
U0	= approach width	B	U5	= Cv
U1	= throat width	b	U6	= Cd
U2	= hump height	p	U7	= Cs
U3	= throat length	L	U8	= A
U4	= slope	m

*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 = (2/3)1.5 x g0.5 x Cv x Cs x Cd x b x h1.5
where : q = flow rate	Cv = velocity coefficient
g = gravitational acceleration	Cs = shape coefficient
b = throat width	Cd = discharge coefficient
h = head
RATIOMETRIC CALCULATION, P4 = 1¤
For flows that can be calculated by the equation:

q = qcal x Cs/Cscal x Cd/Cdal x Cv/Cvcal x (h/hcal)1.5

where :
q = flow rate	Cscal = shape coefficient for maximum head
qcal = flow rate at maximum head	Cv = velocity coefficient
h = head	Cvcal = velocity coefficient for maximum head
hcal = maximum head	Cd = discharge coefficient for head
Cs = shape coefficient for head	Cdcal = discharge coefficient for maximum head

¤Refer to Operation \ Flow Calculation.

7ML19985AB01 OCM III 62