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Landslide hazard mapping

To enhance the city’s resilience to natural hazards we are proposing updates to the landslide hazard overlay map in the City Plan.

Using higher resolution photography and topography, the proposed new mapping gives a more accurate representation of landslide risk.

This proposed mapping identifies an increase in the number of properties with a potential landslide hazard. The majority of properties triggered by the new mapping are within low density, medium density and rural residential zones.

To protect our residents and their property, the landslide hazard overlay code regulates development that occurs on land containing steep and unstable slopes.

The proposed mapping update will be submitted to the State Government for consideration and assessment.

View the proposed landslide hazard overlay mapping update by clicking on the image below:

Preview image of current and proposed landslide hazard mapping tool

The following links provide search lists for qualified architects and engineers:

Related information

Jump to key information
  • What is a landslide?

    A landslide is the movement of a mass of rock, debris or earth down a slope. It is the result of failure of the soil and/or rock materials and is driven by gravity. The occurrence of landslide can follow an intense rainfall event.

  • What is the Landslide hazard overlay map?

    The Landslide hazard overlay map in the City Plan identifies land in the local government area with a moderate, high and very high landslide susceptibility hazard rating.

    Development on sloping land has the potential to create a hazard for property owners and their neighbours, through increasing the risk of landslide on the property; increasing land instability on adjoining lands; or damaging adjoining property as a consequence of landslide.

    Development on land identified in City Plan’s Landslide hazard overlay map triggers assessment against the Landslide hazard overlay code. The code regulates development through the provision of detailed technical assessment and directing the provision of retaining structures and drainage infrastructure.

    The Landslide hazard overlay map and Landslide hazard overlay code are supported by City Plan policy – Geotechnical stability assessment guidelines.

  • My property is now on the Landslide hazard overlay map. What does this mean for me?

    The proposed mapping update will be submitted to the State Government for assessment, prior to going on public exhibition. If the map is endorsed, it will only apply for new development proposals, to ensure that risks to life and property as a result of landslides are mitigated.

    If your property appears on the Landslide hazard overlay map as having a potential landslide hazard, and you are considering developing or redeveloping, you may need a landslide risk assessment to be undertaken by a Registered Professional Engineer of Queensland (RPEQ) specialising in geotechnical engineering (particularly experienced in landslide risk assessment and management).

    In addition to land development requirements, residents are reminded that sensible hillside living includes taking into account the need to minimise vegetation clearing, minimise cut and fill, design and installation of good stormwater drainage, ensuring fill is compacted and ensuring structures are appropriately engineered.

  • What actions can I take to maintain my property that is susceptible to landslide risk?

    Recommended maintenance actions that may reduce the level of exposure to factors that contribute to slope instability include:

    • checking and cleaning drains for effectiveness
    • checking retention structures have suitable drainage
    • checking that sewage/water tanks and pools are water tight
    • landscaping minimises cut/fill, retains vegetation and avoids ponding of water and water concentration into slopes
    • repairing pipes and joins if leakage is evident
    • checking surface protection and slope support is effective (including repair of eroded areas)
    • inspecting buildings for signs of distress and monitoring their property for creep movement.

    Council encourages residents to seek professional geotechnical advice as to what they should be doing in response to the classification for their property.

    Please read the guidelines for control of slope instability.

  • Why is the City proposing updates to the Landslide hazard overlay map?

    The identification and mapping of landslide hazard in the city is a requirement of the State Planning Policy (SPP 2017).

    The City Plan’s current Landslide hazard overlay map was informed by a 2011 Landslide Susceptibility Assessment Report which used a digital terrain model with a 25-metre grid resolution.

    As part of a continual improvement process to better identify natural hazard risk, a higher resolution digital terrain model based on a 10-metre grid was developed. This new terrain model has subsequently been utilised to inform an updated Landslide Susceptibility Assessment Report and associated mapping.

  • Will this mapping change affect my insurance?

    The City is not in a position to conduct individual landslide hazard risk assessments or provide advice in relation to insurance assessments. Please consult your insurance provider for information relevant to your particular circumstance.

    In addition, complying with planning and building controls in relation to slope stability and obtaining and implementing advice from a qualified geotechnical professional will assist in minimising exposure to landslide risk.

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