FLOOD WARNING SYSTEM
This brochure describes the flood
warning system operated by the Australian Government, Bureau of
Meteorology for the Mooloolah River. 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.
Bundilla Alert Station 2007
|Contained in this
document is information about:
(Last updated April 2014)
The Mooloolah River system drains a relatively small catchment with an area of 196 square kilometres that extends 25 kilometres inland from the coast. It flows east-northeast from the Blackall Range, discharging to the sea between Mooloolaba and Point Cartwright.
The Mooloolah River system is susceptible to episodes of rapid flooding which can cause considerable damage to public and private property throughout the catchment. Continuing increases in population have accentuated this potential flood risk to life and property.Previous Flooding
Records dating back to 1972 indicate that major flooding has not occurred frequently in the Mooloolah River, however flooding has occured periodically over the past 30 to 40 years. Significant flood events were reported in 1972, 1989, 1992 as well as in January 2011.
In conjunction with the Sunshine Coast Regional Council, the Bureau of Meteorology operates a flood warning system for the Sunshine Coast streams based on the network of rainfall and river height stations shown on the map. The establishment of the real time ALERT flood reporting network has significantly upgraded the flood warning service.
The Bureau's Flood Warning Centre issues Flood Warnings and River Height Bulletins for the Sunshine Coast Streams during flood events.
The Sunshine Coast Regional Council is able to provide further information on flooding in your area of the Mooloolah River catchment.
The Mooloolah River ALERT flood warning system was completed in 2004 as a co-operative project between the Bureau of Meteorology and the then Caloundra City Council. The system comprises a network of rainfall and river height field stations located in the Sunshine Coast hinterland which report via VHF radio to a base station computer located in the Sunsine Coast Regional Council office at Maroochydore. The field stations send reports for every 1 millimetre of rainfall and every 50 millimetre change in river height.
In consultation with the Sunshine Coast Regional Council, the Bureau issues Flood Warnings for the Sunshine Coast streams, including the Mooloolah River at times..
The base station computers located in the Sunshine Coast Regional Council office collects the data and has 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 Sunshine Coast streams 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 Mooloolah River catchment - it contains the flood gauge heights of the more significant floods.
|Flood Event||Mooloolah||Ewen Maddock Dam||Jordan Street||Palmview||Meridan Way||Parrearra Weir||Tanawha||Mountain Creek|
Historical flood heights for all river stations in the Mooloolah River Floodwarning network, as shown on the map, are available from the Bureau of Meteorology upon request.
MOOLOOLAH CATCHMENT - ASSESSMENT OF THE FLOOD POTENTIAL
Major flooding requires a large scale rainfall situation over the Mooloolah River catchment. Once the Ewen Maddock Dam is at full capacity, overflowing occurs and inundation of the Jordan Street area begins.The following can be used as a rough guide to the likelihood of flooding in the catchment :
Average catchment rainfalls of in excess of 200mm in 24 hours may cause minor to moderate flooding and traffic disabilities to develop, particularly downstream of the Ewen Maddock Dam.
Average catchment rainfalls of in excess of 300mm in 24 hours may cause serious major flooding and traffic disabilities to develop, particularly downstream of the Ewen Maddock Dam.
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.
The diagram above illustrates the Flood Level Classifications for the river height station at Mooloolah. At the 1989 flood level, properties experienced moderate to severe water inundation.
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 Mooloolah River catchment. All heights are in metres on flood gauges.
River Height Station
First Report Height
Minor Flood Level
Crops & Grazing
Moderate Flood Level
Towns and Houses
Major Flood Level
|Ewen Maddock Dam||-||25.4 (S)||26.0||-||26.5||-||27.0|
|Meridan Way||-||2.60 (A)||2.80||-||2.85 (d/s)||-||3.5|
|Parrearra Weir||-||1.74 (W)||1.6||-||2.15||-||2.6|
|Mountain Creek||-||3.30 (B)||2.5||-||3.0||-||3.3|
The above details arecorrect 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