Parshall Flume
•
sized by throat width
•
set on solid foundation
•
general free flow equation is
Q = KH
x
where Q = flow rate
K = constant
H = head
x = exponent
•
for rated flows under free flow conditions,
the head is measured at 2/3 the length of
the converging section from the beginning of
the throat section
•
position the transducer such that it is
centered over the flow at a minimum height
of 30 cm (12") above the maximum head.
plan
side
•
for related flows under free
flow conditions, the head is
measured 15 cm (6")
upstream from the
beginning of the converging
section
•
position the transducer such
that it is centered over the
flow at a minimum height of
30 cm (12") above the
maximum head.
Khafagi Venturi
15 cm
converging
throat
diverging
Q
0 head
side
transducer
0 head
c
2/3 C
Q
SINGLE EXPONENTIAL, P-40 = 1 (cont’d)
FLUMES
front
plan
transducer
PL-399 6 – 36
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