This brochure describes
the flood warning system operated by the Australian Government, Bureau
of Meteorology for the Mulgrave and Russell Rivers. It includes
which will be useful for understanding Flood Warnings and River Height
Bulletins issued by the Bureau's Flood Warning Centre during periods of
high rainfall and flooding.
Flood RiskThe Mulgrave and Russell Rivers drain the mountain country dominated by Bellenden Ker and Bartle Frere, Queensland’s highest mountains and the highest rainfall area in Australia. Gordonvale is the only urban area threatened by flooding in the Mulgrave, however, considerable areas of sugar and other crops that occupy the floodplain can be at risk.The catchment area extends over about 440 square kilometres south of Cairns, 25 km south to the Mutchero Inlet. Flooding in the Mulgrave River can also cut the Bruce Highway and the main rail link to the south at Gordonvale.
The Mulgrave and Russell Rivers have a quite well recorded flood history with documented evidence of flooding beginning in the late 1930's. Records at the key reference gauge at Gordonvale show that the largest flood occurred in early 1967.
The Bureau of Meteorology, Cairns and Tablelands Regional Councils operate a flood warning system for the Mulgrave and Russell River catchments based on a rainfall and river height observations network shown on the map. In consultation with the Council, the Bureau issues flood warnings whenever the Mulgrave River at Gordonvale is expected to exceed the minor flood level of 12 metres. The objective is to provide between 3 to 9 hours warning of flood heights exceeding this level. These warnings are generally updated every three hours.
The Cairns and Tablelands Regional Councils may be able to provide further information on flooding in the area of the Mulgrave and Russell River catchment.
Mulgrave and Russell ALERT SystemA flood warning ALERT network was established jointly by the Bureau of Meteorology, the then Mulgrave Shire Council and the Cairns Port Authority in 1995. Since this time the network has subsequently been expanded by the Cairns Regional Council. Stations in the network are linked by VHF radio to a base station computer in Cairns. The real time data is also transmitted to the Bureau's Flood Warning Centre and used in a hydrologic flood forecast model of the river basin.
The field stations send reports for every one millimetre of rainfall and every 50 millimetre change in river height. The Mulgrave and Russell River network has a total of 6 field stations of which four measure rainfall and river height at Gordonvale, Peets Bridge, The Fisheries and at Clyde Road and two monitor rainfall only at Gillies Lookout and in the Goldsborough Valley.
Flood Warnings and Bulletins
The Bureau of Meteorology issues Flood Warnings and River Height Bulletins for both the Mulgrave and Russell River catchments regularly during floods. They are sent to radio stations for broadcast, and to local Councils, emergency services and a large number of other agencies involved in managing flood response activities.Flood Warnings and River Height Bulletins are available via :
Radio stations, particularly the local ABC, and local commercial stations, broadcast Flood Warnings and River Height Bulletins soon after issue.
Local response organisations
These include the Councils, Police, and State Emergency Services in the local area.
Internet/World Wide Web
Flood Warnings, River Height Bulletins and other weather related data is available on the Bureau's Web page at http://www.bom.gov.au . The Queensland Flood Warning Centre website is http://www.bom.gov.au/qld/flood .
Flood Warnings are available through a recorded voice retrieval system, along with a wide range of other weather related and climate information.
Interpreting Flood Warnings and River Height Bulletins
Flood Warnings and River Height Bulletins contain observed river heights for a selection of the river height monitoring locations. The time at which the river reading has been taken is given together with its tendency (e.g. rising, falling, steady or at its peak). The Flood Warnings may also contain predictions in the form of minor, moderate or major flooding for a period in the future. River Height Bulletins also give the height above or below the road bridge or causeway for each river station located near a road crossing.
One of the simplest ways of understanding what the actual or predicted river height means is to compare the height given in the Warning or Bulletin with the height of previous floods at that location.
The table below summarises the flood history of the Mulgrave and Russell River catchments - it contains the flood gauge heights of the more significant recent floods.
All heights are in metres on flood
Historical flood heights for all
river stations in the Mulgrave and Russell Floodwarning network, as
the map, are available from the Bureau of Meteorology upon request.
At each flood warning river height station, the severity of flooding is described as minor, moderate or major according to the effects caused in the local area or in nearby downstream areas. Terms used in Flood Warnings are based on the following definitions.
Each river height station has a pre-determined flood classification which details heights on gauges at which minor, moderate and major flooding commences. Other flood heights may also be defined which indicate at what height the local road crossing or town becomes affected by floodwaters.
The table below shows the flood classifications for
selected river height stations in the Mulgrave and Russell River
All heights are in metres on flood gauges. (B) = Bridge (O) = Old Bridge
The above details are correct at the time of preparing this document. Up-to-date flood classifications and other details for all flood warning stations in the network are at:
Flood gauge information
For the latest rainfall and river height conditions please use the following link:
For the latest rainfall and river height network map please use the following link:Network maps
further information, contact: