26
Water In Ecosystems: A Non Renewable Resource
Source of errors in the measurement of flow
by weir or flume
MEAN BASIN
RUNOFF
HOURLY
DAILY
WEEKLY
I·
- 0
t
INSTANTANEOUS
DISCHARGE
I ·
CALIBRATION
•
GA1I1Y CONTROL)
PROCESSES
I
AND FACTORS
INSTRUMENTS
(
)
AND
TECHNIOUES
SOURCES
0
OF ERROR
OUALl1Y
(
)
CONTROL
DECISION
<>
KEY
SET-UP, WAVES AND SURGES AT TAPPING POINT, LAG IN PIPE
AND WELL, PRESSURE DIFFERENCES BETWEEN WELL AND RIVER. ZERO
OF RECORDER, TEMPERATURE AND MECHANICAL FAULTS IN RECORDER,
NON-STABLE PAPER, ELECTRONIC FAULTS IN LOGGER, DIFFERENTIAL
MOVEMENT ACROSS STRUCTURE
I
APPROACH AND TAILWATER CONDITIONS,
ROUGHNESS &
lEMPERATURE CHANGES,
DEBRIS, WEEDS
NATURAL
RUNOFF
Figure 2. Source of errors in the measurement of flow by weir or flume,
Water In Ecosystems: A Non Renewable Resource
Source of errors in the measurement of flow
by weir or flume
MEAN BASIN
RUNOFF
HOURLY
DAILY
WEEKLY
I·
- 0
t
INSTANTANEOUS
DISCHARGE
I ·
CALIBRATION
•
GA1I1Y CONTROL)
PROCESSES
I
AND FACTORS
INSTRUMENTS
(
)
AND
TECHNIOUES
SOURCES
0
OF ERROR
OUALl1Y
(
)
CONTROL
DECISION
<>
KEY
SET-UP, WAVES AND SURGES AT TAPPING POINT, LAG IN PIPE
AND WELL, PRESSURE DIFFERENCES BETWEEN WELL AND RIVER. ZERO
OF RECORDER, TEMPERATURE AND MECHANICAL FAULTS IN RECORDER,
NON-STABLE PAPER, ELECTRONIC FAULTS IN LOGGER, DIFFERENTIAL
MOVEMENT ACROSS STRUCTURE
I
APPROACH AND TAILWATER CONDITIONS,
ROUGHNESS &
lEMPERATURE CHANGES,
DEBRIS, WEEDS
NATURAL
RUNOFF
Figure 2. Source of errors in the measurement of flow by weir or flume,