Flood Studies

Council specific technical guidance

Design rainfall (LIMB) guidance

Ipswich City Council uses a suite of localised Intensity-Frequency-Duration (IFD) design rainfall data known as the Lockyer-Ipswich-Moreton Bay (LIMB) IFD data. It was published in 2020 and is hosted on the AR&R Data Hub. Additional information on the LIMB IFD is found in the Jurisdiction Specifics drop-down menu on the Data Hub and includes a link to the final LIMB report. 

Due to the different data baseline, the climate change uplift factors specified in AR&R v4.2, Book 1, Chapter 6 are applicable only for the 2016 Bureau of Meteorology design rainfall. Additional work was completed on appropriate climate change uplift factors applicable for the LIMB IFD data. The addendum report provides this guidance.  

Climate change interim guidance

Following the publication of AR&R v4.2, Council's interim position on applicable climate change scenarios to be considered when undertaking stormwater design can be found here:

Flood studies

Council's flood study program continually prioritises and updates the city's repository of flood models (both river and creek scale) to maintain a current understanding of flood behaviour. This includes periodical updates in accordance with national technical guidelines such as Australian Rainfall and Runoff (AR&R) and Council specific requirements above.

The latest Council flood study reports are available below. The flood studies (and their versions) that inform the Ipswich City Plan 2025 are listed in Schedule SC6.3 Flood Risk and Overland Flow Planning Scheme Policy, and may differ from those listed. While the latest flood information will be incorporated into future amendments of the City Plan, their inclusion may lag due to statutory and procedural requirements. Being technical documents, assistance from a qualified professional should be obtained if necessary.

Please contact council@ipswich.qld.gov.au for further information.

Please note: Flood study models are only provided to professionals to facilitate development applications which require hydraulic impact assessments. A service fee is necessary to access the models.

REGIONAL:

Ipswich Rivers Flood Studies Update

The Ipswich Rivers Flood Studies Update models the Bremer River catchment from Moogerah Dam to the Brisbane River confluence.

Ipswich Citywide Overland Flow Mapping Study

Ipswich Council’s citywide rainfall-on-grid hydraulic model is not available for distribution externally. It is for internal use only. Its purpose is to identify where potential overland flow paths could form due to terrain characteristics across the city. The report is made available to provide information on how the model was developed and the filtering methodologies that were applied.

 

BREMER RIVER CREEKS:

Bundamba Creek Flood Study

Deebing Creek Flood Study

MiHi Creek Flood Study

Newtown area Flood Study

Rosewood area Flood Study

Thagoona area Flood Study

Walloon area Flood Study

Western Creek Flood Study

 

BRISBANE RIVER CREEKS:

Goodna Creek Flood Study

Sandy Creek Camira Flood Study

Six Mile Creek Flood Study

Tallegalla and Woolshed Area Flood Study

Woogaroo Creek Flood Study

 

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