( P602 cont’d )
values ( P600 = 3 ):
index value
1 height D
H Flume
(as developed by the U.S. Department of Agriculture, Soil Conservation service)
» sized by max depth of flume, D. Enter value ( in units of P005 ) into P602.
» approach is preferably rectangular, matching width and depth for
distance 3 to 5 times the depth of the flume.
» may be installed in channels under partial submergence
( ratio of downstream level to head ).
Typically: » 1% error @ 30% submergence
» 3% error @ 50% submergence
» for rated flows under free flow conditions, the head is measured at a
point downstream for the flume entrance.
» H flumes come with a flat or sloping floor. The same flow table can be
used as error is less than 1%.
point of measurement
transducer
plan
front
Flume Size Point of Measurement
( D ft ) cm inches
0.5 5 1
3
/
4
0.75 7 2
3
/
4
1.0 9 3
3
/
4
1.5 14 5
1
/
2
2.0 18 7
1
/
4
2.5 23 9
3.0 28 10
3
/
4
4.5 41 16
1
/
4
PARAMETERS
PL-507 111
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