Hydrologic Reference Stations

Streamflow data quality codes for Hydrologic Reference Stations

Introduction

Streamflow data providers use different codes to describe the quality of each individual streamflow observation.  Most agencies use a numerical coding scheme ranging from 1 to 255, where a lower number generally indicates a better quality of observation. Coding is partly objective and partly subjective. It reflects, among other things, the accuracy of the gauging used to define the relevant rating table, the accuracy of the method used to establish the rating, and the accuracy of the stage measurement. There is inconsistency in coding schemes between jurisdictions, or even sometimes between different agencies in the same jurisdiction. Moreover, different agencies use different criteria to rate the quality of their streamflow observations. The number of distinct code values used to describe streamflow data varies between about 15 and 60, depending on the agency (Viney et al, 2010).

The Bureau of Meteorology (the Bureau) has developed a nationally consistent quality coding scheme for streamflow data in consultation with the data providers. The Bureau's streamflow data quality codes and their descriptions are given in Table 1. The Bureau, in consultation with the data providers, has mapped each data provider's native code to the new national code.

The purpose of this report is to provide the mapping of quality codes between each Hydrologic Reference Station's data provider and the Bureau.

 

Table 1 Description of streamflow quality codes for incoming data

Bureau quality code

Description

Description to be used by data providers for transferring data to the Bureau

A

The record set is the best available given the technology, techniques and monitoring objectives at the time of classification.

The data provider releases recorded measurements for use, declaring that the record set is the best available given the technology, techniques and monitoring objectives at the time of classification.

B

The record set is compromised in its ability to represent the parameter accurately.

The data provider releases recorded measurements for use with the provision that the data are compromised in their ability to represent the monitored parameter.

C

The record set is an estimate.

The data provider releases the record set for use, declaring that the data are estimates.

E

The ability of the record set to represent the monitored parameter accurately is not known.

The data provider releases the record set declaring that the data's ability to represent the monitored parameter is not known.

F

The record set is not of release quality or contains missing data.

The data provider releases the record set declaring that the data are missing, void or known to be incorrect.

 

Quality code mapping of the agencies covered by Reference Stations

The following tables show the mapping between data providers' quality coding and the Bureau's five-level national coding scheme for Hydrologic Reference Station data. Some of the codes that explicitly refer to quantities other than streamflow (e.g. precipitation, constituent concentrations) have been excluded from the tables. Coding levels are coloured according to the colour scheme in Table 1.

For the Tasmanian Department of Primary Industries, Parks, Water and Environment, and WaterNSW, these mappings are provisional only and are open to revision and amendment in consultation with the relevant provider.

Table 2  Australian Capital Territory—Icon Water Ltd; Environment and Planning Directorate
IWL/EPD quality code Description Bureau quality code

1

Good reliable data

A

2

Good data; small adjustment required

A

3

Data is reflecting general trends but is not considered very accurate.

B

4

Correlated data

B

5

Water Level below CTF but data is OK

A

6

Not yet verified

E

10

Good reliable gauging

A

11

Gauging requires another gauging to substantiate its accuracy

A

12

Unreliable, gauging disregard

F

13

Volumetric gauging

A

15

No SG reading to verify data

A

16

Intake/sensor completely buried with silt

E

17

Water level below orifice

E

19

Estimated data

A

20

Alarm test event

F

21

Sensor failed

F

22

Control drowned out by downstream influence

B

23

Control blockage, data not representative of actual flow

B

24

Ramping of data due to algae on sensor

B

26

Good daily read records

A

27

Good twice weekly read records

A

30

Irregular Time Rate Data - weekly/monthly read.

B

31

Level data erroneous due to Venturi effect

B

32

Unknown external influence data not representative

E

33

Discharge obtained using stage only

B

34

Discharge obtained using stage and velocity data

B

51

Occasional gaps of not more than two days interpolated

C

52

Several readings per day during high flows, plotted on strip chart then processed through digitizer

B

53

Partially silted inlet or orifice, reliable interpolation

B

76

Reliable interpolation

B

77

Correlation with other station, same variable

C

78

Correlation with other station, different variable

C

79

Records partly estimated

C

80

Accumulated

A

82

Linear interpolation across gap in records.

F

102

Obtained by conversion, from discharges plotted on old drawing

C

103

Unreliable interpolation

C

104

Records estimated

C

105

Records lost - Max. & Min. water level or total rainfall available only

F

106

Unreliable time rate

C

107

Unreliable records, silted inlet or orifice

C

108

Gauge drowned out

C

109

Poor quality records, plotted on strip chart then processed through digitizer

C

110

Stage variable exceeded chart limit

F

140

Level below CTF

A

145

Discharge not reliable Rating under review

B

150

Rating table extrapolated due to inadequate gauging information

C

151

Data not yet available

F

155

Discharge not available Rating under review

F

156

Sensor out ranged

F

160

Water level below sensor

F

201

Data not recorded

F

202

Rating table not available

F

255

No Record

F

 

Table 3  New South Wales - NSW Department of Industry, Skills and Regional Development - DPI Water
NSW DISRD quality code Description Bureau quality code

1

RATINGS/TS - No data in the period have been adjusted from sensing system measurement in any way - see code definitions

A

2

TS - Data adjusted during processing - see code definitions

A

3

RATINGS/TS - No data in the period have been adjusted from sensing system measurement in any way - see code definitions

A

4

TS - Data adjusted during processing - see code definitions

A

5

RATINGS/TS - No data in the period have been adjusted from sensing system measurement in any way - see code definitions

A

6

GAUGINGS - Good Gauging to AS3778; TS - Data adjusted during processing - see comments

A

7

RATINGS/TS - Large uncertainty - data in period not adjusted from sensing system measurement in any way - see code definitions; GAUGINGS - Good Gauging

B

8

TS - Data adjusted during processing - see comments

B

9

RATINGS/TS - Large uncertainty - data in period not adjusted from sensing system measurement in any way - see code definitions

B

10

TS - Data adjusted during processing - see comments

B

11

TS-Synthetic or Artificial Data. Data which does not relate directly to the measured variable but for which a valid code is required

C

12

GAUGINGS - Acceptable Gauging

F

17

GAUGINGS - Reasonable Gauging

F

26

TS - Daily, accumulated or spot data

E

30

Pre 21 Aug 2004 - RATINGS/TS - Highly accurate continuous records

B

31

GAUGINGS - Brief Gauging High Flow

F

32

Pre 21 Aug 2004 - TS - Good continuous record.

B

33

Pre 21 Aug 2004 - TS - Good record processed +/- 10mm, within 30 minutes

B

34

Pre 21 Aug 2004 - RATINGS - Good record where number of gaugings >=5, 95% within 10% curve

A

35

GAUGINGS - Normal Gauging Bad Site, Normal Gauging Backwater Affected, Surface Velocities

F

36

Pre 21 Aug 2004 - TS - Good spot samples (daily read) +/-15 minutes

B

38

Pre 1 Nov 1996 - RATINGS/TS - Good record processed prior to 1/11/96

A

39

Pre 21 Aug 2004 - TS - Water level below sensor and no flow/dry stream

C

40

Pre 21 Aug 2004 - TS - Fair measured data

B

41

Pre 21 Aug 2004 - RATINGS/TS - Fair measured data

E

44

Pre 21 Aug 2004 - RATINGS - Fair record where 95% of flow gaugings within 20% of discharge

B

45

Pre 21 Aug 2004 - TS - Spot samples of fair quality, +/- 1 hour

E

46

Pre 21 Aug 2004 - TS - Level estimated to +/-20mm, time unknown

E

51

TS - Data estimated - see comments

C

52

RATINGS - Backwater affected - see comments

B

54

GAUGINGS - Unverified Gauging

F

57

Pre 21 Aug 2004 - TS - Data limited by client spec. fulfils requirement of qc40

B

58

Pre 1 Nov 1996 - TS - Fair record processed prior to 1/11/96

B

60

Pre 21 Aug 2004 - TS - Poor measured data, time +/- 2 hours.

B

61

Pre 21 Aug 2004 - RATINGS/TS - Poor measured data

E

62

Pre 21 Aug 2004 - RATINGS - High segment Rating table gaugings <5

B

63

Pre 21 Aug 2004 - RATINGS - Low segment Rating table gauging<5 (often unstable)

B

64

Pre 21 Aug 2004 - RATINGS - Poor measured data, 95% of flow gaugings within 30% of discharge

B

65

Pre 21 Aug 2004 - TS - Spot samples, conditions as per poor data, +/- 2 hours;

E

66

Pre 21 Aug 2004 - TS - Data within +/-20cm, time unknown

C

67

Pre 21 Aug 2004 - RATINGS/TS - Data limited by client specifications - Poor measured data, time +/- 2 hour

B

68

Pre 1 Nov 1996 - RATINGS/TS - Record processed prior to 1/11/96 considered poor

B

69

Pre 21 Aug 2004 - RATINGS - Rating table gaugings >=5 Less than 95% within 30% of curve

F

71

GAUGINGS - Part Gauged/ Estimated

F

75

Pre 21 Aug 2004 - RATINGS - Reasonable estimate where rating derived by one method

C

77

Pre 21 Aug 2004 - RATINGS/TS - Data limited by client specifications - Poor measured data, time +/- 2 hour

B

80

Pre 1 Nov 1996 - RATINGS - Rating processed prior to 1/11/96, coded estimated (poor)

C

82

Pre 21 Aug 2004 - RATINGS - Good estimate where rating has 3 methods agreeing to 10%

C

91

Pre 21 Aug 2004 - RATINGS - Fair estimate where rating has 2 methods agreeing to 20%

C

94

Pre 1 Nov 1996 - RATINGS - Rating processed prior to 1/11/96, coded extrapolated - good

C

95

Pre 1 Nov 1996 - RATINGS - Rating processed prior to 1/11/96, coded extrapolated - fair

C

100

Quality unknown

E

130

Not quality coded - subject to change

E

140

RATINGS - Current rating - may be subject to change.

E

145

TS - Telemetry system added point

E

151

Pre Aug 2004 QC - Data Not Available

F

152

Pre 21 Aug 2004 - RATINGS/TS - Backwater affected - see comments

F

153

GAUGINGS - Invalid Gauging

F

180

Rating table out of range, no flow available

F

201

Data unavailable

F

255

Data Unavailable

F

 

Table 4  New South Wales - WaterNSW
WaterNSW quality code Description Bureau quality code

5

  Good quality edited data

A

6

  Reasonably good quality edited data

B

7

  Good quality contractor supplied data

A

8

  Good quality data but standards compromised to meet client

  requirements

B

10

  Good quality digitized data

A

11

  Good quality record processed pre-1995 and coded either 5 or 6

B

12

  Good quality telemetered data

A

19

  Good quality rating extrapolation

B

20

  Good qual theoretical rating-Standard primary device e.g. weir

B

25

  Good quality daily totals derived from logged data

A

26

  Good quality daily read records

A

28

  Good quality cumulative total for daily readings after an unread

  period

A

29

  Daily read gauge not read

B

30

  Below sensor with NO flow conditions

B

31

  Evaporation pan overflowed - nil evap.

A

35

  Good quality data with fog

B

36

  Good quality snow data

A

39

  Below instrument threshold

B

40

  Good quality estimate (correlation or other reliable method)

A

55

  Fair quality edited data

B

57

  Fair quality contractor supplied data

C

58

  Fair quality data but standards compromised to meet customer

  requirements

C

60

  Fair quality digitised data

B

61

  Fair quality record processed pre 1995 and quality coded 55

C

62

  Fair quality telemetered data

B

69

  Fair quality rating extrapolation

C

70

  Fair quality theoretical rating derived by two or more means and

  not substantiated by discharge observations

B

75

  Fair quality daily totals derived from daily read data

B

76

  Fair quality daily read record

B

78

  Fair quality cumulative total for daily readings after an unread

  period

B

79

  Fair quality daily read gauge not read

B

85

  Fair quality data with fog

B

86

  Fair quality snow data

B

90

  Fair quality estimation (correlation or other method)

B

105

  Poor quality edited data

E

107

  Poor quality contractor supplied data

E

108

  Poor quality data - standards compromised to meet client

  specifications prior to December 2003

E

110

  Poor quality digitised data

E

111

  Poor quality records processed pre 1995 and quality coded 105

E

112

  Poor quality telemetered data

E

119

  Poor quality rating extrapolation

E

120

  Poor quality theoretical rating using one formal method of

  extension & has not been substantiated by discharge observations

E

125

  Poor quality daily totals derived from logged data

E

126

  Poor quality daily read records

E

128

  Poor quality cumulative total for daily readings after an unread

  period

E

129

  Poor quality daily read gauge not read

E

135

  Poor quality data with fog

E

136

  Poor quality data with snow

E

140

  Estimate that reasonably reflects the actual event with edit   

  comments inserted to explain method of estimation

E

149

  Contractors data supplied without quality codes

E

150

  Data not yet quality coded

E

151

  Backwater affected

E

152

  Data for which quality

E

160

  Above instrument threshold (Range of instrument exceeded)

E

161

  SENSOR OUT OF WATER WITH FLOW

E

162

  SENSOR OUT OF WATER WITH NO FLOW

E

181

  Time of sample not known - data satisfactory

E

201

  Data not recorded - logger/sensor not installed

F

202

  Data not available for release (e.g. requires extensive editing)

F

204

  Data lost due to vandalism

F

205

  Data lost

F

207

  Contractors data lost or not recorded

F

255

  Hydsys default - no data

F

 

Table 5  Northern Territory - Department of Land Resource Management
DLRM quality code Description Bureau quality code

1

Good - continuous data

A

2

good quality - continuous data - some minor editing

A

6

Good Point data-manually entered which adequately represents continuous record

A

7

Good Isolated Point

A

11

Good Gauging

A

41

Good Rating

A

45

Good Rating Extrapolated

A

51

Satisfactory - continuous data

B

52

Satisfactory - estimated continuous data

B

56

Satisfactory Point data—manually entered—which adequately represents data

B

57

Satisfactory Isolated Point

B

61

Satisfactory Gauging

B

91

Satisfactory Rating

B

95

Satisfactory Rating - extrapolated

B

101

Poor - continuous data

B

102

Poor - estimated continuous data

B

106

Poor Point data manually entered

B

107

Poor Isolated Point

B

109

Estimated Data - original lost

C

111

Poor Gauging

B

141

Poor Rating

B

142

Telemetry data. No visual verification. Final quality code not yet assigned.

E

145

Poor rating - extrapolated

B

146

Rating based on theoretical method, use with caution

C

149

Gauging with no Calibration Reading

E

150

Rating under Review - not Quality Coded

E

151

Blank or no data (Met. Bureau rainfall only)

F

152

Incomplete record

E

162

Severe tidal influence - not to be integrated

E

170

Data not processed [Historic, Q=Y]

E

171

Data awaiting editing and quality coding.

E

172

Isolated point - no integration/not quality coded

E

173

Tidal influence- Orig. data (VAR=100)+ Integrated data (VAR=102

E

174

Vax conversion code: data to be Edited to another Qual. code

E

175

Dry - below orifice

B

176

Wet - below orifice

B

190

Missing record, gap auto filled.

F

192

Lookup Table - exceeded

F

250

Non-sensible record - used for Time or below Inlet, above CTF

F

251

Non-sensible record, sensor outranged

F

252

Sensor broken

F

253

Logger broken

F

254

No Recorded Data (Instrumentation removed)

F

255

No Record or Record Lost

F

 

Table 6  Queensland - Department of Natural Resources and Mines
DNRM quality code Description Bureau quality code

1

Good (actual)

A

9

CITEC - Normal Reading

A

10

Good

A

15

Water level below threshold (no flow)

A

19

CITEC - No Flow Reading

A

20

Fair

A

26

BOM data - Good Daily Read Records

A

30

Poor

B

31

Gauging temp - Good

A

32

Gauging temp - Fair

A

33

Gauging temp - Poor

B

34

Gauging temp - composite

B

35

Gauging temp - equipment problems causing incomplete gauging - suspect procedures and methods. Possible inflow between gauging and station.

B

36

Gauging temp - Velocity measurements taken on surface only or velocity measurements with floats.

B

37

Gauging temp - Discharge correlated from U/S or D/S stations.

B

38

Gauging temp - Interim code for data transferred from CITEC. Data not yet Quality Coded.

E

39

Gauging temp - Data of No Value

F

59

CITEC - Derived Height

A

60

Estimate

C

69

CITEC - Derived Discharge

A

79

CITEC - Backwater Record

B

80

BOM data - Accumulated

A

119

Old - Gauge Ht > instrument threshold

C

130

Not coded value

E

140

Interim value

E

150

Unknown

E

151

Data not yet available

F

160

Suspect

F

170

Water level above threshold

F

180

Old - Gauge Height < Instrument Threshold

F

200

Water level below threshold

F

 

Table 7  South Australia - Department of Environment, Water and Natural Resources
DEWNR quality code Description Bureau quality code

1

Good

A

25

Operational Data

A

30

Fair

B

31

Fair - Estimated

C

36

Fair - Extrapolated Rating

B

37

Fair - Theoretical Rating

B

40

Fair - Extrapolated Rating

C

41

Fair - Theoretical Rating

C

54

Fair - Smoothed Data

B

80

Fair - Accumulated Data

B

81

Fair - Accumulated Total

B

82

Fair - Straight Line Interpolation Between Points

B

84

Fair - Rainfall Less Than 0.2mm

B

85

Fair - Redistributed Accumulated Daily Data

C

90

Poor

C

91

Poor - Estimated

C

100

Poor - Extrapolated Rating

C

101

Poor - Theoretical Rating

C

102

Poor - Extrapolated Rating

C

108

Poor - Theoretical Rating

C

127

Poor - Nil Daily Record within Accumulated Period

C

128

Poor - Accumulated Total for Preceding Period of Daily Data.

C

129

Poor - Distributed Total

C

130

Water Level Below Recordable Range

E

132

Quality Unknown

E

150

Unverified Telemetered Data

E

153

Not Recorded - Outside Recordable Range

F

154

Not Operating

F

201

Missing

F

202

Missing - Outside Rating Range

F

 

Table 8  Tasmania - Department of Primary Industries, Parks, Water & Environment
DPIPWE quality code Description Bureau quality code

1

Excellent Data

A

3

Excellent Rating

A

11

Good Data

A

13

Good Rating

A

21

Fair Data

B

22

Good Estimate

B

23

Fair Rating

B

24

Good Theoretical Rating

B

25

Forecast data from modelling program

C

29

Data from external source, minor checking and editing completed.

E

30

Data from external source, no checking or editing done.

E

31

Poor

C

32

Fair Estimated data

C

33

Poor Rating

C

34

Fair estimated rating

C

42

Poor estimated data

C

44

Poor estimated rating

C

101

Data checked and found unreliable

E

141

SCADA data not verified.

E

142

Telemetry data not verified.

E

145

Failed minimum range check

E

146

Failed maximum range check

E

147

Non Conforming data. Known Errors.

E

150

Unverified Data or Rating. Final quality yet to be assigned.

E

180

Unprocessed Record

F

190

Lost record or insufficient data for reasonable archive

F

200

No data available for this period

F

201

Rating application error

F

202

Data point below lower limit of rating

F

203

Data point above upper limit of rating

F

204

No rating for chosen period of data

F

205

No applicable rating

F

210

Undefined Vector

F

211

Integration method not appropriate

F

212

Differentiation method not appropriate

F

213

Data type change or other error - No Aggregation

F

214

Data type change or other error - No Interpolation

F

220

Value of time series point unknown

F

225

Serial Run Gap. Check reason then assign appropriate code

F

230

User specified limits exceeded in analysis

F

 

Table 9  Tasmania - Hydro-Electric Corporation (Hydro Tasmania)
HEC-TAS quality code Description Bureau quality code

1

Excellent Data

E

3

Excellent Rating

E

5

NEM Energy Metering, Actual Meter

E

7

Good data.  Confirmed by site visit.  (Dam Safety data only)

E

11

Good Data

E

13

Good Rating

E

21

Fair Data

E

22

Good Estimated Data.

E

23

Fair Rating

E

24

Good Extrapolated Rating

E

25

Modelled or Derived data. Includes forecast data or data derived from ratings etc.

E

27

Interim code for telemetered data visually checked on graphical editor against appropriate comparison plots. No fault found but a more definitive final code cannot be assigned until after a field visit.

E

29

Data from source external to Resource Monitoring & Information Group. Minor checking & editing may have been done.

E

30

No requirement for Quality Coding and/or checking or editing.  Data is often from source external to Resource Monitoring & Information Group.

E

31

Poor Data

E

32

Fair Estimated Data

E

33

Poor Rating

E

34

Fair Extrapolated Rating

E

40

Excluded Gauging. A gauging that has been formally identified and excluded as part of a rating review. The gauging comment will say why it was excluded. No code necessary.

E

41

Important Comment ...

E

42

Poor Estimated Data

E

44

Poor Extrapolated Rating

E

101

Data that has been checked and found to be unreliable.

F

138

NEM Energy Metering,  Estimated Energy Data

E

139

NEM Energy Metering, Final estimation or substitution

E

140

Manually acquired.  Unverified data. May have been visually inspected. Final quality code not yet assigned.

E

141

SCADA data. Not verified. Final quality code not yet assigned.

E

142

Telemetry data.  Not verified. Final quality code not yet assigned.  [Same code marker (T) as Q149]

E

143

Acquired data, not verified, flagged by source as suspect. For SCADA data the associated source Q code is 128.  Final quality code yet to be assigned.

E

144

NEM Energy Metering, Substitution

E

145

Minimum range check threshold exceeded. Final quality code not yet assigned. Don’t tinker with it. It is also assigned in the system setup table See also Q155 and 191

E

146

Maximum range check threshold exceeded. Final quality code not yet assigned. Don’t tinker with it. It is also assigned in the system setup table See also Q156 and 191

E

147

Non conforming data. Known errors. LOW IMPACT. Final quality code not yet assigned.

E

149

Data from an EXTERNAL source.  No verification. Final quality code not assigned and, for many cases, it may never be assigned. [Same code marker (T) as Q142]

E

150

Partial Statistic - some data missing in period.  A SYSTEM quality code applied to data when processing/outputting.  Not to be applied by individuals as a quality code when editing data.

F

155

Minimum range check threshold exceeded, data excluded from analysis. Data value is preserved. Used by automated range check scripts see also Q code 145 and 191

F

156

Maximum range check threshold exceeded, data excluded from analysis. Data value is preserved. Used by automated range check scripts see also Q code 146 and 191

F

157

Control value not for inclusion in analysis

F

160

Where a param val does not exist at that time (a);

Null turbidity when 0 flow in a stream (b);

Vals exceed range vals of deliberately limited range sensor (c);

Input series to virtual out of range (d).

F

170

Non conforming data. Known errors. HIGH IMPACT. Final quality code not yet assigned.

F

180

Unprocessed Record, data exists (e.g. charts) but not yet imported.

F

190

Lost record, erroneous data or insufficient data for reasonable archive; or DATA lost from an OPEN site.

F

191

Lost data where out of range data deemed spurious has been amended as it was archived.  The data value is what the spurious value was clipped to. Pre-existing clips have not been converted to output to t

F

200

No data available for this series for the period. Associated with series that are CLOSED and later RE-OPENED.  Do not confuse with QC190 that covers data that was lost from an OPEN site.

F

201

Error occurred in applying rating equation to data

F

202

Data point below lower limit of rating

F

203

Data point above upper limit of rating

F

204

Period found but specified rating does not exist

F

205

No application period found for data point.     Rating period error.

F

206

No conversion available

F

207

Interpolation error. This may be caused by a timing error or by incompatible data types.

F

208

Rating/conversion is non invertible.

F

209

Chain conversion uses datum which is outside range of rating

F

210

Undefined vector. Resultant vector has zero length.

F

211

Integration inappropriate for this data type - data types 3,4,7

F

212

Differentiation inappropriate for this data type - data types 2,3,4,7,8,9

F

213

Data Type change or other problem encountered - no Aggregation allowed.

F

214

Data Type change or other problem encountered - no Interpolation allowed.

F

220

No value or quality associated with current point.

F

225

Gap between time series records. Code assigned when gap is filled automatically by archiving operations. Check reason and then assign appropriate quality code

F

230

Original quality in user specified exclusion range. Generated by QMax and QExclude transformations.

F

255

Used for initialisation purposes

F

 

Table 10  Victoria - Department of Environment, Land, Water and Planning
DELWP quality code Description Bureau quality code

1

Good continuous records

A

2

Good quality edited data

A

3

Linear infill to first value in block (no data lost)

A

4

Temporary coded for Currumbeene data

E

5

Drawdown - chart rating applies

A

6

Phased Rating Applicable - gradual changing of control & channel

A

8

Pool reading only

A

9

Pool dry - no data collected

A

10

Data transposed from recorder chart

A

13

Accurate derived data from multiple sources (level & flow)

A

14

Telemetry data not stored in archive

A

15

Minor editing

A

20

Edited to measurements

A

26

Daily read records (MW - Good periodic data)

A

30

Good Meas. - mult. point; 40 sec timing (Good acc. data - MW)

A

31

Good Meas. - Adeq. verts & obs; 40 sec timing (Good acc. data - MW)

A

32

Fair Measurement - Weighted mean gauge height; turbulent flow; flow angle extreme

B

35

Composite Measurement - Segments taken from several gaugings to create a composite

B

36

Measurement for sampling purposes. Rough estimate

C

42

Low velocity acoustic record affected by wind or gate opening

E

50

Medium editing >Q=15 (1996 on & MW) or HYMAN data import (pre-1996)

B

75

Height correction applied

B

76

Reliable interpolation

B

77

Correlation with other station; same variable

B

100

Irregular data use with caution

E

104

Records estimated

C

146

Drawdown - no rating applies

E

148

Theoretical rating table applied

C

149

Raw data as received from Serco (MW)

E

150

Rating extrapolated due to insufficient gaugings (Unrel. data - MW)

C

151

Data lost due to natural causes - NRE approved loss

F

152

Refer station file

E

153

PROBE OUT OF WATER/BELOW INSTRUMENT THRESHOLD

F

155

ABOVE INSTRUMENT THRESHOLD

F

160

Backed-up by d/s influence. (Unreliable periodic data - MW)

E

161

Debris Effecting Sensor.

F

165

Suspect or bad data supplied by other authority

E

170

Raw unedited data stored in archive (Unrel. accum. data - MW)

E

180

Equipment malfunction

F

190

Data unavailable station discontinued

F

200

Data available but not digitised

F

201

Data not rec. - no correlation available (Station not op. - MW)

F

235

Poor Measurement - Not enough verticals or observations; not enough information

E

236

Suspect or Incomplete Measurement - Equipment suspect or giving problems causing measurement to be aborted.

E

237

Surface Velocities - Velocity measurements taken on surface only.

B

238

Control Leaking - Control leaking; either as noted on measurement or chart.

E

239

Backed up Flow Measurement - Measurement is affected by backup.

A

240

Not Coded Measurement - Measurement not coded as per HYDSYS System.

E

250

Rating table suspended

F

254

Rating table exceeded

F

255

No Data Exists (Lost data - MW)

F

 

Table 11  Victoria - Melbourne Water Corporation
Melbourne Water quality code Description Bureau quality code

1

Very good data-no editing required (+/- 1-5mm error or +/-5% deviation from Bulk or Cal check +/-3% and Excellent reference to nearby gauge)

A

2

Good quality edited data-minor editing only (+/-5% deviation from Bulk or Calibration check +/-3% and Excellent reference to nearby gauge)

A

3

Linear infill to first value in block (no data loss - Thiess Quality)

B

7

Very good data/ rating not applicable due to backwater effect

A

8

Pool reading only (Thiess Quality)

A

9

Pool dry - no data collected (Thiess Quality)

E

14

Unknown quality

E

15

Minor editing only (Thiess Quality)

A

19

Good quality rating extrapolation

A

26

Good periodical data (MWH)

A

27

Good periodical data (Others - not continuous reading)

A

30

Good accumulated data (MWH - continuous reading)/ Good measurement - multi point 40 sec timing

A

31

Good accumulated data (Others - continuous reading)/ Good measurement - adeq. verts & obs -40sec timing

A

32

Fair measurement - weighted mean gauge height/ turbulent flow/ flow angle extreme

E

33

3 point measurement - applicable in narrow sections e.g. sewers

E

34

Bucket measurement - applicable to weirs/ pipe outflow etc.

E

35

Composite measurement - segments taken from several gaugings to create a composite

E

36

Measurement for sampling purposes - rough estimate

C

41

Good Data not validated by other means

A

50

Good or Reliable data-medium editing required (+/- 5-10mm error or +/-10% deviation from Bulk or Cal check +/-5%/ Good ref to nearby gauge)

A

57

Good/reliable data or rating not applicable due to backwater

A

65

Other authorities data (Thiess Quality)

B

69

Fair quality rating extrapolation

B

75

Fair data-major editing required (+/- 10-15mm error or +/-15% deviation from Bulk or Cal check +/-7% and Fair reference to nearby gauge)

B

76

Fair data/ edited by correlation with another site/ gaps <0.5day filled by interpolation

B

77

Reliable data correlation with another station same variable

C

79

Fair data/ rating not applicable due to backwater effect

B

82

Linear interpolation across gap in records

B

 

 

 

101

Reliable data estimate using good correlation with other variable/ Estimated Rating or regenerated velocity sewerage data

C

120

Estimated data not using correlation (ave. dry weather hydrograph used) or Rating extrapolated

C

130

Estimated periodical data/ slightly suspect staff gauge readings

C

140

Estimated accumulated data/ slightly suspect check bottle reading, etc.

C

147

Raw unverified data from source system (e.g. SCADA/ Logger)

E

148

Theoretical rating table applied

C

149

Raw data as received from contractor/ only quality codes changed

B

150

Poor data/ historical rating or rating not verified/ use with caution at clients discretion

F

151

Poor or unverified data. Use with caution (+/- 15-25mm error or +/-20% deviation from Bulk or Cal check +/-10% and poor ref to nearby gauge)

F

153

Probe out of water or outside instrument threshold

F

155

Poor data due to reasons beyond the control of hydrographic contractor

F

157

Poor data/ rating not applicable due to backwater or drawdown effect

F

160

Unreliable data (>25mm error) or unreliable periodical data

F

161

Unreliable data due to reasons beyond the control of hydrographic contractor

F

170

Unreliable accumulated data/ suspect check reading

F

201

Station not commissioned - instrument not installed or known not to be working or no sewerage data

F

204

Unknown Quality (perhaps introduced from another agency)

E

235

Poor measurement - not enough verticals or observations

F

236

Suspect or incomplete measurement - equipment problems causing measurement to be aborted

F

237

Surface velocities - velocity measurement taken on surface only

B

238

Control leaking as noted on measurement or chart

B

239

Backed up flow measurement - measurement affected by back water

B

240

Data lost due to reasons beyond the control of hydrographic contractor

F

241

Data lost

F

250

Invalid data due to telemetry system fault

F

253

No rating table period for site

F

254

No data available or rating table exceeded

F

255

Gap Quality

F

 

Table 12 Victoria - Murray Darling Basin Authority
MDBA quality code Description Bureau quality code

1

Reliable measured continuous data.

A

10

Credible continuous data

A

20

Reliable Intermittent data.

A

30

Measured edited fair quality

B

40

Modelled/correlated/estimated

C

50

Interpolated and edited measured data

C

60

Credible Intermittent

C

70

Measured data - poor quality

C

80

Modelled/correlated/extrapolated/interpolated

C

90

Poor Intermittent

C

100

Dubious data - see comments

C

120

Correlated/interpolated - QC unknown

C

132

Manually entered data - QC unknown

C

136

Auto/Tele entered data -QC unknown

C

138

Daily Point Data

C

140

Intermittent - QC unknown

C

150

MAXIMUM GOOD QUALITY

C

155

Data lost - continuous

F

160

Data lost - Intermittent

F

213

Missing Data

F

240

Unverified Continuous Ops Data

F

242

Suspect Continuous Ops Data- Hyaudit failed

F

 

Table 13  Western Australia - Department of Water
DoW WA quality code Description Bureau quality code

1

Very good record

A

2

Very good record - Corrections applied

A

3

Good record - Corrections or estimations applied

A

4

Estimated record - Good

C

5

Estimated record - Fair

C

6

Estimated record - Poor

C

10

Estimated record - Not reviewed / quality not known

E

11

Theoretical rating

C

12

Estimated rating

C

24

Rainday within period of accumulated record

B

25

Accumulated record

A

30

Station data, as supplied by BoM

E

31

Deaccumulated using nearby station

C

32

Deaccumulated using interpolated data

C

33

Nearby station, data from BoM

E

34

Interpolated daily observations

B

35

Interpolated long term average

C

41

Gauging - Excellent

A

42

Gauging - Good

A

43

Gauging - Fair

B

44

Gauging - Poor

B

100

Sample Group Code - WIN SAMP CUSTODIANS

E

101

Sample Group Code - WIN SAMP CUSTODIANS

E

102

Sample Group Code - WIN SAMP CUSTODIANS

E

103

Sample Group Code - WIN SAMP CUSTODIANS

E

104

Sample Group Code - WIN SITE SAMPLE CUST

E

105

Sample Group Code - WIN SITE SAMPLE CUST

E

106

Sample Group Code - WIN SITE SAMPLE CUST

E

107

Sample Group Code - WIN SITE SAMPLE CUST

E

108

Sample Group Code - WIN INV CUSTODIANS

E

109

Sample Group Code - WIN INV CUSTODIANS

E

110

Sample Group Code - WIN INV CUSTODIANS

E

111

Sample Group Code - WIN INV CUSTODIANS

E

151

Below inlet

F

152

Not available

F

161

Unrated

E

 

Implementation of quality codes in Hydrologic Reference Stations

In the implementation of streamflow quality codes in Hydrologic Reference Stations, the five quality code descriptions were simplified for general users. Table 14 gives the Hydrologic Reference Stations classification of these quality codes.

 

For data supplied as quality ‘F’ by data providers, that is the record set is not of release quality or contains missing data, these gaps are filled and termed as quality ‘G’.

Table 14  Streamflow quality codes in Hydrologic Reference Stations

Quality

Description

Classification in  Hydrologic Reference Stations

A

The record set is the best available given the technologies, techniques and monitoring objectives at the time of classification.

Best available data

B

The record set is compromised in its ability to represent the parameter accurately.

Good data

C

The record set is an estimate.

Poor data

E

The record set’s ability to represent the monitored parameter accurately is not known.

Unreliable data

G

The record set is not of release quality or contains missing data. Therefore these gaps in data are filled.

Gap-filled data

 

Figure 1 shows the graphical representation of streamflow data quality in Hydrologic Reference Stations classification for a site. An example of daily data download is given in Table 15, where the Bureau’s quality code corresponding to the provider’s quality code is given. This report is useful for advanced users who would like to know the data quality in more detail.


Graphical representation of streamflow data quality codes in Hydrologic Reference Stations classification
Figure 1 Graphical representation of streamflow data quality codes in Hydrologic Reference Stations classification

Table 15 An example of data download with Bureau's quality codes

Date

Flow (ML)

Bureau’s

quality code

15/01/1966

38.842

A

16/01/1966

37.734

A

17/01/1966

36.604

A

18/01/1966

35.679

A

19/01/1966

35.181

A

20/01/1966

34.869

A

21/01/1966

34.559

A

22/01/1966

34.251

B

23/01/1966

34.098

G

24/01/1966

34.098

C

25/01/1966

34.887

C

26/01/1966

55.988

C

27/01/1966

58.718

C

28/01/1966

54.517

C

29/01/1966

51.508

C

30/01/1966

48.727

C

 

References

Viney, N., McMahon, T.A. and Chiew, F.H.S. 2010. Classification of streamflow datasets for Bureau of Meteorology national streamflow database. Bureau of Meteorology, Report in press.


Creative Commons By Attribution logo
Unless otherwise noted, all material on this page is licensed under the Creative Commons Attribution Australia Licence