FLOOD WARNING SYSTEM
This brochure describes the flood
warning system operated by the Australian Government, Bureau of
Meteorology for the Condamine River to Warwick. 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.
Condamine River at Killarney
|Contained in this
document is information about:
(Last updated April 2014)
The Condamine River catchment to Warwick covers an area of approximately 1300 square kilometers and includes the major tributaries Swan Creek, Emu Creek and Rosenthall Creek which join the Condamine River just upstream of Warwick. The headwaters of these tributaries rise in the Dividing Ranges. Due to the fan like shape of the catchment, heavy rainfalls over the catchment are capable of causing major flooding of agricultural areas adjacent to the waterways, and major flooding of residential and commercial areas of Killarney and Warwick.
Flood records for Warwick extend back as far as 1887 and indicate that the city has a long history of flooding from the Condamine River. The highest recorded flood occurred in February 1976 when the river rose to a height of 9.10 metres on the Warwick flood gauge located at McCahon Bridge. The flood caused widespread flooding in the Warwick area with newspapers at the time reporting damage to over 100 homes and over 1000 people left homeless during the flood. The most recent major flood events occurred two weeks apart in December 2010 and January 2011.
The Bureau of Meteorology and the Southern Downs Regional Council jointly operate a flood warning system for the Condamine River catchment to Warwick using data from the rainfall and river height observations network shown on the map. The network consists of automated radio telemetry stations (ALERT) as well as telephone telemetry and volunteer manual rainfall and river height observers.
The ALERT stations send data directly to a base station located in Warwick Shire offices and to the Bureau's Flood Warning Centre in Brisbane. Data from the system is analysed by computer models to provide early indication of possible river rises throughout the catchment and to enable accurate and timely flood warnings and forecasts.
The Southern Downs Regional Council is able to provide further details on local flooding in the rural areas of the Condamine River catchment to Warwick and also in the residential areas of Killarney and Warwick.
The Condamine River catchment to Warwick ALERT flood warning system was completed in the mid 1990's as a co-operative project between the Bureau of Meteorology and the then Warwick City Council. The system comprises a network of rainfall and river height field stations located in the catchment which report via VHF radio to base station computers located in Council offices at Warwick and the Bureau of Meteorology in Brisbane. The field stations send reports for every 1 millimetre of rainfall and every 50 millimetre change in river height.
The base station computers located in the Southern Downs Regional Council offices collect the data and have software that displays it in graphical and tabular form. The data is also received by the Bureau's Flood Warning Centre where it is used in hydrologic models to produce river height predictions.
The Bureau of Meteorology issues Flood Warnings and River Height Bulletins for the Condamine River catchment to Warwick 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 Condamine River catchment to Warwick - it contains the flood gauge heights of the more significant recent floods.
|Flood Event||The Head||Killarney||Elbow Valley||Murray's Bridge||Warwick|
Historical flood heights for all river stations in the Condamine River catchment to Warwick as shown on the map, are available from the Bureau of Meteorology upon request.
RIVER CATCHMENT TO WARWICK
Major flooding requires a large scale rainfall situation over the Condamine River catchment to Warwick. The following can be used as a rough guide to the likelihood of flooding in the catchment :
Average catchment rainfalls in excess of 25mm, with isolated 50mm falls, in 24 hours may result in stream rises and the possibility of minor flooding and local traffic disabilities and extending downstream.
Average catchment rainfalls in excess of 50mm, with isolated 75 to 100mm falls, in 24 hours may result in significant stream stream rises with the possibility of moderate to major flooding developing with local traffic disabilities and 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 Condamine River catchment to Warwick.
River Height Station
First Report Height
Minor Flood Level
Crops & Grazing
Moderate Flood Level
Towns and Houses
Major Flood Level
|The Head||2.0||2.0 (C)||4.0||4.0||4.5||4.3||5.0|
|Killarney||2.0||6.70 (B)||4.0||4.0||5.0 (d/s)||6.5||6.0 (d/s)|
|Warwick (McCahon Bridge)||2.0||7.00 (B)||5.0||6.0||6.0||6.2||7.0|
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