Data Quality Codes
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Quality Code
Description
1
Good data
2
Good quality edited data
10
Good Measurement
15
Provisional measurement
20
Dry, no flow
26
Data imported from historic records.
30
Irregular Time Rate Data-weekly/monthly read.
35
Estimated data imported from historic records.
40
Fair Measurement
50
Unknown Measurement Quality
52
Mean gauge height for period of flow
55
Extrapolated rating between highest measurement and 2x highest measurement; reliable extrapolation
60
Above Rating, extrapolated above 2x highest measurement; unreliable extrapolation
70
Estimated Data
71
Manual reading
76
Reliable interpolation
77
Correlation with other station, same variable
79
Records partly estimated
80
Accumulated
82
Linear interpolation across gap in records.
85
Flooded
104
Records estimated
110
Estimated flow calculation due to backwater influences
120
Poor Measurement
130
Estimate
140
Data not yet checked
150
Rating table extrapolated due to inadequate gauging information
151
Data Missing
152
Flow occured on this day.  Mean stage for period of flow not published.
160
Above Rating, no flow calculated
161
Below Rating, no flow calculated
170
Unreliable Data
172
Stage below the crest of weir.
179
Records partly estimated
185
Flooded, no flow calculated
190
Stage-onlystation, no rating
199
Multivariate rating equation required.  Use MODSYN.
201
Data not recorded
255
No data exists
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