Bush fire prone land mapping identifies different vegetation types and surrounding areas that may be affected by bush fire. Vegetation is classified into categories based on the potential bush fire hazard associated with that vegetation type. These categories are used to identify land where bush fire planning and development considerations may apply.
Category 1 – High bush fire risk vegetation
Category 1 represents vegetation that is considered to pose the highest bush fire hazard due to its structure, density and ability to carry intense fire.
This category generally includes vegetation types such as:
- forests and woodlands
- heathlands and shrublands
- dense native vegetation capable of supporting significant fire behaviour
Land located within or near Category 1 vegetation may be exposed to higher levels of radiant heat, flame contact and ember attack during a bush fire. Development within these areas typically requires careful design and assessment to ensure appropriate bush fire protection measures are incorporated.
Category 2 – Lower bush fire risk vegetation
Category 2 represents vegetation that is considered to present a lower bush fire hazard than Category 1 vegetation but may still support bush fire spread under certain conditions.
This category may include vegetation such as:
- open woodlands
- scattered trees
- managed vegetation or partially cleared land
While the bush fire hazard is generally lower, development near Category 2 vegetation may still require consideration of bush fire protection measures depending on the proximity of buildings to vegetation.
Category 3 – Grasslands
Category 3 mapping identifies grassland areas that may present a bush fire hazard. These areas may include native or improved grasslands and open landscapes where grass fuels may carry fire.
Although grassland fires can behave differently to forest fires, they can still spread rapidly under the right conditions and may present a risk to nearby development.
The inclusion of Category 3 land in bush fire mapping recognises that grassland environments can contribute to bush fire risk and ensures that appropriate planning consideration is given where development is proposed in these areas.
Bush fire buffer areas
In addition to vegetation categories, bush fire prone land mapping includes buffer areas surrounding identified vegetation.
Buffers are applied to account for the potential spread of bush fire, including:
- radiant heat exposure
- ember attack
- fire spread from adjacent vegetation
These areas may still be affected by bush fire even though vegetation may not be located directly on the site.
Development within buffer areas may still require bush fire assessment and appropriate building or design measures depending on the level of risk.
Together, vegetation categories and buffer areas help identify land that may be exposed to bush fire hazard and ensure that appropriate planning and development controls are applied to reduce risk to people, property, and the environment.