FLOOD WARNING SYSTEM
for the
COOPER CREEK CATCHMENT

Cooper Creek at Nappa Merrie

Contained in this document is information about: (Last updated November 2017) Flood Risk Previous Flooding Flood Forecasting Local Information Flood Warnings and Bulletins Interpreting Flood Warnings and River Height Bulletins Flood Classifications Other Links

Flood Risk

The Thomson-Barcoo-Cooper catchment drains an area of approximately 237,000 square kilometres and is the largest river basin in Queensland. The catchment falls within the Lake Eyre basin, the largest and only co-ordinated internal drainage system in Australia with no external outlet, and which covers over 1.1 million square kilometres of central Australia. Floodwaters reach Lake Eyre after major flood events in the Cooper.

The two main tributaries, the Thomson and Barcoo Rivers, merge into the Cooper Creek approximately 40 kilometres upstream of Windorah. The Thomson River and its tributaries flow in a general southerly direction and has several of the larger towns of the region including Longreach and Muttaburra along its banks. The Barcoo River flows in a general westerly direction and has major centres such as Isisford, Blackall, Barcaldine, Jericho and Tambo in its catchment.

The Thomson-Barcoo-Cooper basin can be divided into two distinct areas:

In the dry season, the channels are restricted to numerous lagoons and claypans. During the wet season the actual main channel becomes hard to define, particularly when the river at Windorah could be up to 40 kilometres wide. Below this point however, in a big flood, the area becomes a huge inland sea broken only by a few ridges and numerous stunted trees.

Previous Flooding

Records of large floods in the area extend back as far as the late 19th century, with the most significant episodes of flooding occurring in 1893, 1906, 1949, 1955, 1963, 1974, 1990 and 2000. Some of the more recent floods are summarised in table form later in this document.

Flood Forecasting

The Barcaldine and Blackall-Tambo Regional Councils, in conjunction with the Bureau of Meteorology operate a flood warning system for the Barcoo River catchment. The ALERT network consists of automatic rainfall and river height stations which regularly forward data via radio telemetry to base stations located at the Council offices in Blackall and Alpha and the Bureau's Flood Warning Centre in Brisbane. The system provides early warning of heavy rainfall and river rises in the catchment and enables more accurate and timely flood warning and forecasts.

The network also 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 at Longreach, Barcaldine, Stonehenge and Blackall, operated by the Department of Natural Resources and Mines and at Windorah which is operated by Barcoo Shire Council.

The Bureau's Flood Warning Centre issues Flood Warnings and River Height Bulletins for the Thomson, Barcoo Rivers and Cooper Creek during flood events. Quantitative flood forecasts are issued for Longreach, Jundah, Blackall, Jericho and Windorah when moderate flood levels are likely to be exceeded. 

Local Information

Local Council's throughout the Thomson, Barcoo Rivers and Cooper Creek catchment may be able to provide further details of flooding in your area.  

Flood Warnings and Bulletins

The Bureau of Meteorology issues Flood Warnings and River Height Bulletins for the Thomson, Barcoo Rivers and Cooper Creek 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
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 .

Telephone Weather
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 Thomson, Barcoo Rivers and Cooper Creek basin - it contains the flood gauge heights of the more significant recent floods.

Historical flood heights for all river stations in the Thomson, Barcoo Rivers and Cooper Creek Floodwarning network, as shown on the map, are available from the Bureau of Meteorology upon request

Flood Classifications

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 buildings 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 Thomson, Barcoo Rivers and Cooper Creek catchment.   

All heights are in metres on flood gauges. (B)= Bridge (O) = Old bridge   (A) = Approaches  (C) = Causeway  (X) = Crossing  

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: