Flood risk assessment services
Flood risk assessment that clarifies constraints and supports safe, approvable development outcomes.
Flood risk is a defining constraint for land use across much of Australia, and getting the assessment right shapes what can be built, where, and to what level. Flood risk assessment examines how flood waters behave across a site — depths, velocities, flow paths, and the frequency of inundation — and what that means for people, property, and access. Environmental Specialists Australia provides flood risk input for development and infrastructure projects, drawing on council flood studies and mapping to define the constraints a project must design around.
Assessment sits within a framework that combines national floodplain management principles with council flood studies and planning controls that vary considerably between local government areas. Our consultants interpret available flood data, identify the planning implications for a proposal, and advise on measures such as minimum floor levels, filling limits, and evacuation considerations. Where a project requires detailed hydraulic modelling, we scope and coordinate that work so it answers the questions the consent authority will ask.
When is this service required?
- Development applications on land mapped as flood-prone or flood-affected
- Site feasibility where flood constraints could affect yield or layout
- Projects requiring minimum floor level or filling justification
- Infrastructure crossing or adjacent to floodplains and watercourses
- Council requests for a flood risk or flood impact assessment
- Emergency access and evacuation planning for occupied development
Our process
- Flood data review: Review of council flood studies, mapping, and available modelling relevant to the site and catchment.
- Constraint definition: Definition of flood levels, flow paths, and hazard categories that apply across the site.
- Planning assessment: Assessment of the proposal against council flood controls and floodplain management principles.
- Mitigation advice: Advice on floor levels, filling, access, and other measures to manage flood risk to acceptable levels.
- Documentation: Preparation of flood risk assessment documentation and support through council determination.
What we deliver
- Flood risk assessment reports with flood level and hazard information
- Interpretation of council flood studies and mapping
- Planning constraint and design level advice
- Flood mitigation and evacuation considerations
- Coordination of hydraulic modelling where required
- Responses to council flood-related requests for information
Frequently asked questions
- How do I know if my site is flood-affected?
- Most councils publish flood studies and mapping, and many issue flood-related planning certificates identifying whether land is flood-prone. We review these sources for your site, confirm which flood levels and controls apply, and explain what they mean for a proposed development.
- What does a flood risk assessment determine?
- It defines how flood water behaves across the site — depths, velocities, and flow paths — and the resulting hazard and planning constraints. From that it establishes design requirements such as minimum floor levels and filling limits, and identifies access and evacuation considerations for the proposed use.
- Will flooding stop me from developing my land?
- Not always. Flood affectation is a constraint to design around rather than an automatic barrier. Depending on the hazard and the proposed use, measures such as raised floor levels, appropriate access, and land use controls can often make development acceptable. The assessment clarifies what is feasible.
- Do you carry out detailed flood modelling?
- Where a project needs detailed hydraulic modelling to resolve flood behaviour, we scope and coordinate that work as part of the assessment so it addresses the questions the consent authority will raise. For many proposals, existing council flood data is sufficient to define the constraints.