Telemetered data are provided publicly by the Department of Water (DoW) as a service for general interest only. The telemetry data is automatic, direct from the field site and hence is unaudited (ie. unchecked), and should be used with caution.
There are five locations where river data is shown:
Map: This is a user interactive map of Western Australia showing locations and data for each telemetry site;
River Level Data: This table is specifically designed to show levels from telemetered gauging stations in the whole state and indicate their status. It has links to specific plots and information for the stations. Further explanation on its layout is available below;
Rainfall Data: This table is specifically designed to show data from DoW telemetered rainfall stations. It has links to specific plots and information for the stations;
Other Parameters: This table is specifically designed to show other data from DoW telemetered sites. This data includes levels, conductivity, temperature, dissolved oxygen and dam storage levels where available. It has links to specific plots and information for the stations;
2. Level Reporting (Stage)
DoW gauging stations report water level in "Stage".
Stage is the base level (or Datum) that does not change when the river bed level changes. It provides a static reference over time for local flood levels. When a gauging station is constructed, the level at which the river ceases or stops flowing - the cease to flow (CTF) - is given a nominal Stage of 10.000m. This avoids the confusion of having negative levels when the river bed level changes (through erosion or redesign of a weir) or the pool level falls below its outlet level.
The "River Level" is the level of water in the river above the current CTF. River levels are only provided as a guide to the depth of the water in a river. If the river level is absent in the tables, this implies that the river is not flowing.
A geographic datum such as Australian Height Datum (AHD) allows levels at a gauging station to be compared with levels of a feature like a town. Where the relationship between AHD and Stage is known, it is commented in the Flood Table.
3. Table Explanation
River Level Data:
The main table used for displaying river levels is the River Level Data. It provides the following information:
MAX REC LEVEL
|612002||COLLIE RIVER||MUNGALUP TOWER *||03:45 14Jul2000||09.800||-||-00.007||STEADY||14.625||23Jan1982|
|Normal telemetered gauging station running normally|
|609014||ARTHUR RIVER||MOUNT BROWN||03:44 1Mar2205||NO DATA||NO DATA||-||-||13.724||21Jan1982|
|Whole Line in Grey highlights that the data is likely to be erroneous;|
|610025||SABINA DIVERSION||WUNNERUP EAST ROAD||09:03 14Jul2000||10.599||0.599||-00.003||STEADY||NO DATA||NO DATA|
|Columns in blue indicates Stage that is above the wet season Median;|
|612043||COLLIE RIVER||ROSE ROAD||03:49 14Jul2000||10.719||0.719||00.034||RISING||14.486||02Aug1996|
|Column in red indicates Stage that is RISING at a rate of more than 25mm / 3hr;|
|612230||COLLIE RIVER EAST TRIB||JAMES CROSSING *||03:55 14Jul2000||10.476||0.476||-00.014||FALLING||12.711||22Nov1971|
|Column in green indicates Stage that is FALLING at a rate of more than 25mm / 3hr;|
The Rainfall Data lists DoW telemetered rainfall stations. It does not list Bureau of Meteorology rain gauges which are listed on their Web site: BoM observations. The DoW rain table provides the following information:
This is a summary table specifically to list DoW telemetered sites where information other than river level is recorded and is termed the Other Parameters. The additional parameters table provides the following information:
4. Data Errors
Where obvious errors exist in the summary tables (due to communications or equipment faults), the specific lines in the table are "greyed" out to indicate they should not be used. This has been automated to pick up most errors, but it is possible that the reported data may be unknowingly wrong.
Where there is no current data in Plots or Reports (eg a plot that shows a scale of 0 to 1 metres with no stage plotted) is most likely due to a temporary on-site equipment fault.
5. Polling Frequency
Generally, a statewide poll of all telemetered sites is automatically completed once every day, with the information made available by approximately 07:00.
Where a special regular polling regime is in progress, this will be noted in the comments above and below the River Level Data.