FLOOD WARNING SYSTEM
This brochure describes the flood
warning system operated by the Australian Government, Bureau of
Meteorology for the Logan and Albert Rivers. It includes reference
information 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.
Looking upstream at Beenleigh on the Albert River
|Contained in this
document is information about:
(Last updated April 2014)
The Logan River has a catchment area of about 3850 square kilometres and lies in the south east corner of Queensland. The catchment extends from the Logan City-Beenleigh area in the north to the McPherson Ranges in the south on the Queensland-NSW border. The major tributaries are the Albert River and Teviot Brook. Smaller tributaries include Running, Christmas, Burnett and Canungra Creeks in the headwaters. Major flooding is experienced in both rural and urban areas of the catchment although major flooding in the upper part of the catchment does not necessarily result in significant flooding in the lower catchment.
Scrubby and Slacks Creeks in the lower reaches of the Logan River can be subject to flash flooding as well as backwater flooding during major river flood events.
Records of large floods in the Logan-Albert Rivers extend back as far as 1887, and since then there have been several major flood events. The flood of January 1974 was the most severe in recent memory. Severe floods have occurred in the upper reaches of the Logan River in February 1976 and February 1991.
The Bureau of Meteorology operates a flood warning system for the Logan and Albert River catchments based on a rainfall and river height observations network shown on the map. The network consists of a number of volunteer rainfall and river height observers who forward observations by telephone when the initial flood height has been exceeded at their station, as well as automatic telephone telemetry stations which are operated by the Department of Natural Resources & Mines and the Bureau of Meteorology.
In conjunction with the Logan City Council, the Bureau also operates an ALERT radio telemetry network of Floodwarning stations in the lower reaches of the Logan River in the Slacks Creek and Scrubby Creek catchments, as well as the station at Waterford on the Logan River. These rainfall and river height stations regularly send data via radio telemetry to a base station located in Council offices and the Bureau's Flood Warning Centre in Brisbane. The system provides early warning of heavy rainfalls and river rises throughout the catchment and enables more accurate and timely flood warning and forecasts.
The Bureau's Flood Warning Centre issues Flood Warnings and River Height Bulletins for the Logan and Albert Rivers during flood events. Quantitative flood forecasts are issued for Waterford when the level is likely to exceed 6.0 metres or minor flood level.
The Logan City Council and Scenic Rim Regional Council are able to provide further information on flooding in your area of the Logan and Albert River catchments.
The Bureau of Meteorology issues Flood Warnings and River Height Bulletins for the Logan and Albert 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.
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.
|Main Directory||Phone||1900 955 360|
|Flood Warnings||Phone||1300 659 219|
Telephone Weather Services Call Charges:
1900 numbers: 77c per minute incl. GST; 1300 numbers: Low call cost - around 27.5c incl. GST.
(More from international, satellite, mobile or public phones)
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 Logan and Albert River catchments - it contains the flood gauge heights of the more significant recent floods.
|Flood Event||Bromfleet||Wolffdene||Beenleigh||Boonah||Dulbolla||Round Mounatin||Yarrahappini||Maclean Bridge||Waterford||Eagleby|
Historical flood heights for all river stations in the Logan and Albert River catchments Floodwarning network, as shown on the map, are available from the Bureau of Meteorology upon request.
LOGAN AND ALBERT RIVER CATCHMENTS - ASSESSMENT OF THE FLOOD POTENTIAL
Major flooding requires a large scale rainfall situation over the Logan and Albert River catchments. The following can be used as a rough guide to the likelihood of flooding in the catchment :
Average catchment rainfalls in excess of 200mm in 24 hours, may result in significant stream rises and the possibility of moderate to major flooding and local traffic disabilities in the middle to lower reaches of the Logan River below Maclean Bridge and the Albert River below Bromfleet extending downstream.
Average catchment rainfalls in excess of 300mm in 24 hours, may result in significant stream rises and the possibility of severe major flooding and local traffic disabilities in the middle to lower reaches of the Logan River below Maclean Bridge and the Albert River below Bromfleet extending downstream.
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.
|Minor Flooding :
Causes inconvenience. Low-lying areas next to watercourses are
inundated. Minor roads may be closed and low-level bridges submerged.
In urban areas inundation may affect some backyards and buildings below
the floor level as well as bicycle and pedestrian paths. In rural areas
removal of stock and equipment may be required.
Moderate Flooding :In addition to the above, the area of inundation is more substantial. Main traffic routes may be affected. Some buidlings may be affected above the floor level. Evacuation of flood affected areas may be required. In rural areas removal of stock is required.
Major Flooding :In addition to the above, extensive rural areas and/or urban areas are inundated. Many buildings may be affected above the floor level. Properties and towns are likely to be isolated and major rail and traffic routes closed. Evacuation of flood affected areas may be required. Utility services may be impacted.
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 Logan and Albert River catchments.
River Height Station
First Report Height
Minor Flood Level
Crops & Grazing
Moderate Flood Level
Towns and Houses
Major Flood Level
|Round Mountain||-||13.00 (B)||6.0||-||9.5||-||13.0|
|Maclean Bridge||6.0||17.00 (A)||10.0||-||13.5||15.2||16.0|
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:
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