FLOOD WARNING SYSTEM
for the
HERBERT RIVER

This brochure describes the flood warning system operated by the Australian Government, Bureau of Meteorology for the Herbert 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.

Herbert River at Halifax, March 1997 Herbert River at Halifax, March 1997
Flooding in the aftermath of Cyclone Joy
(Photo: The Herbert River Express)
Contained in this document is information about:
(Last updated May 2011)

Flood Risk

The Herbert River catchment is located on Queensland's north tropical coast to the north of Ingham. The Herbert River has its headwaters in a high rainfall area of the Dividing Range near Herberton and flows through a gorge to the coastal plain near Ingham. The river continues to its mouth near Lucinda where the catchment area is approximately 9000 square kilometres.The flood-producing rainfalls, up to 600mm over a few days, usually occur in the lower part of the catchment. In less frequent events, the highest rainfalls occur in the upper catchment above Gleneagle.

The Herbert River responds quickly to heavy rainfall and river rises can be rapid and velocities very high. The area around Ingham is very flat and the town itself is located on the floodplain of the river. Several natural watercourses distribute floodwaters through the town during major flooding with virtually the whole town being at risk from flooding. Floodwater up to depths of 3 metres above ground level occurs in low parts of the town, requiring the evacuation of residents and their property from low lying areas.

Previous Flooding

Since records commenced in early 1900s, major floods have occurred regularly in the Herbert River. Major floods usually occur in the wet season from January to March, but smaller floods have occurred in April and December. The figure below shows the significant flood peaks which have occurred at the Ingham Pump Station and Gairloch.

Highest Annual Flood Peak Diagram

Highest Annual Flood Peak Diagram

Flood Forecasting

The Bureau of Meteorology operates a flood warning system for the Herbert River catchment based on a rainfall and river height observations network shown on the map. The installation of the real time ALERT flood reporting network enables predictions to be made earlier and with more accuracy. The Bureau's Flood Warning Centre issues Flood Warnings and River Height Bulletins for the Herbert River catchment during flood events. Quantitative flood forecasts are issued when moderate flood levels are likely to be exceeded.

Local Information

The Hinchinbrook Shire Council and the Tablelands Regional Council are able to provide further information on flooding in your area of the Herbert River catchment.

Herbert ALERT System

The Herbert  River ALERT flood warning system was completed in 1995 as a co-operative project between the Bureau of Meteorology and the Hinchinbrook Shire Council. The system comprises a network of rainfall and river height field stations located above and below the Herbert River Gorge and which report via VHF radio to a base station computer located in the Council office in Ingham.The field stations send reports for every 1 millimetre of rainfall and every 50 millimetre change in river height. 
 
The base station computer in the Hinchinbrook Shire 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. 

Flood Warnings and Bulletins

The Bureau of Meteorology issues Flood Warnings and River Height Bulletins for the Herbert River catchment 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.

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)

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 Herbert River catchment - it contains the flood gauge heights of the more significant recent floods.

River height station
Mar
1967
Mar
1977
Feb
1986
Jan
1998
Feb
1999
Mar
2006
Feb
2007
Feb
2009
Feb
2011
Ravenshoe 7.53 5.16 6.91 - 6.45 - 5.56 4.51 5.80
Archers Creek 9.75 6.87 9.76 5.41 7.88 6.52 - 6.39 7.53
Silver Valley 9.69 6.60 6.96 4.03 6.72 5.87 4.92 5.92 6.38
Wooroora 10.12 7.50 10.70 7.39 - - - - 8.30
Gunnawarra - - - - - - - - 7.10
Cameron Creek - - - - - - - 8.37 6.95
Gleneagle Homestead 19.00 16.20 13.25 8.50 13.58 7.60 9.00 12.47 -
Gleneagle 17.73 14.75 11.52 7.55 11.70 6.74 8.28 12.53 9.02
Blencoe Falls - - - - - - - 7.57 6.57
Nash's Crossing - - - 10.65 8.75 5.75 5.65 11.20 6.85
Zattas 11.10 9.76 9.40 10.12 7.47 5.03 6.13 9.73 -
Abergowrie - 17.48 14.46 15.76 12.48 8.79 10.83 15.93 13.15
Abergowrie Bridge 20.65* 18.60 16.50 17.20 13.85 10.04 12.69 17.24 15.04
Elphinstone Pocket - - - - - 10.00 12.60 16.50 -
Running Creek - - 4.79 6.09 - - 5.58 8.39 5.38
Peacock Siding 9.10 14.20 5.75 10.50 14.10 9.15
Trebonne 16.73 - - - - 10.68 12.83 15.70 -
Ingham Pump Station 15.20 15.06 14.45 14.76 13.50 10.87 12.34 14.75 13.95
Gairloch 12.60 12.25 12.22 12.30 11.90 10.20 11.60 12.25 12.25
Halifax 5.35  - 5.37 5.42 5.22 5.37 5.67 5.47
All heights are in metres on flood gauges. 
[*] These heights are taken at old gauge sites and may not relate to flood levels from existing gauges sites. 

Historical flood heights for all river stations in the Herbert River Floodwarning network, as shown on the map, are available from the Bureau of Meteorology upon request.

HERBERT RIVER CATCHMENT - ASSESSMENT OF THE FLOOD POTENTIAL

Major flooding requires a large scale rainfall situation over the Herbert River catchment. 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 stream rises with moderate to major flooding and traffic disabilities to develop, particularly in the lower reaches of the Herbert River downstream of the Gorge extending to the Ingham township and the Herbert River delta area around Halifax and Lucinda. 

Average catchment rainfalls of in excess of 300mm in 24 hours may cause significant stream rises with major flooding and traffic disabilities to develop, particularly in the lower reaches of the Herbert River downstream of the Gorge extending to the Ingham township and the Herbert River delta area around Halifax and Lucinda.

Flood Classifications

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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 Herbert River catchment. 

River Height Station
First Report Height
Crossing Height
Minor Flood Level
Crops & Grazing
Moderate Flood Level
Towns and Houses
Major Flood Level
Ravenshoe - - - - - - -
Archers Creek - - 6.0 - 7.0 - 8.0
Silver Valley - - 5.0 - 6.0 - 7.0
Wooroora - - - - - - -
Gunnawarra - - - - - - -
Cameron Creek - - - - - - -
Gleneagle Homestead 4.0  - 8.0 8.0  8.5 (d/s)  - 9.0 (d/s)
Gleneagle - 7.0 7.5  - 8.0
Blencoe Falls - - - - - - -
Nash's Crossing - - 4.5 - 6.0 - 7.5
Zattas - - 3.5 - 5.2 - 7.5
Gowrie Creek - - 5.5 - 6.5 - 7.5
Abergowrie - - 5.5 - 8.5 - 12.5
Abergowrie Bridge - 10.1 (B) 6.0 6.0 10.0 11.0 14.0
Elphinstone Pocket 5.6 10.1 (B) 6.0 6.0 10.0 11.0 14.0
Running Creek - - 5.0 - 6.0 - 7.0
Peacock Siding 1.0  0.5 (B)  10.0 10.0  12.0 14.0  14.0
Trebonne - - 10.0 - 11.0 - 12.0
Ingham Pump Station - - 10.0 11.0 - 12.0
Gairloch 4.0 4.1 (B) 9.5 6.0 10.5 11.5 11.5
Halifax 2.0 6.5 (A) 4.0 4.5  - 5.0
All heights are in metres on flood gauges. 
(B) = Bridge  (A) = Approaches (d/s) = Downstream

The above details are correct at the time of preparingthis document. Up-to-date flood classifications and other details for all flood warning stations in the network are at:

http://www.bom.gov.au/qld/flood/networks/index.shtml

Catchment Map showing the Herbert River flood warning network

Click here to view map as:          PNG           PDF(715K bytes)

For further information, contact:
The Regional Director, Bureau of Meteorology, GPO Box 413, Brisbane Q 4001