What Is Environment Agency Flood Data? Product 4, 5, 6 and 7 Explained

Environment Agency flood data underpins how flood risk is assessed in the English planning system, yet it is one of the most misunderstood parts of the process. Terms like "Product 4" or "Product 6" get passed around in pre-application advice, planning discussions and consultant quotes, usually with no one stopping to say what they actually are.

Start with the thing most people get wrong: Environment Agency flood data is not a single map or report. It is a structured set of national datasets, modelling outputs and evidence used to understand flood risk and support a Flood Risk Assessment. This guide explains what that data is, what Product 4, 5, 6 and 7 mean, how to request each one, and where it fits in a planning submission.

Product 4 is the dataset most planning applications rely on, and the Environment Agency works to a service window of up to 20 working days to return it.

What do we mean by Environment Agency flood data?

Environment Agency flood data is a collection of national datasets used to understand and manage flood risk across England. It is not one map, but a combination of modelling, historic records and spatial data that together inform planning and development decisions.

At its most accessible level it includes the Flood Map for Planning, which shows whether land falls within Flood Zone 1, 2 or 3. Those zones are the starting point for a planning decision, but the data underneath goes well beyond the headline map. Since the 2025 and 2026 updates to the Flood Map for Planning, the public service also carries surface water and climate change information it did not show before.

• The Flood Map for Planning. The public-facing map showing fluvial and tidal Flood Zones 1, 2 and 3 for a site.
• Surface water flood risk mapping. Separate national mapping of the risk from rainfall run-off, refreshed through NaFRA2.
• Historic flood records. Records of where flooding has actually been observed, which can differ from the modelled picture.
• Flood defence information. The location and standard of defences, and the residual risk behind them.
• Hydraulic modelling outputs. Detailed model results (flood levels, depths and velocities) that sit behind the maps.

How is Environment Agency flood data used in planning?

Environment Agency flood data is the baseline evidence in a planning decision. It sets the starting position for a site before any site-specific analysis is added.

• Identifying risk. Establishing whether a site is at risk of flooding, and from which sources.
• Triggering an assessment. Determining whether a Flood Risk Assessment is required for the application.
• Informing the tests. Feeding the Sequential and Exception Tests where higher-risk land is involved.
• Guiding design. Supporting decisions on site layout, finished floor levels and mitigation.

The duty to assess flood risk using the best available information is set out in the Environment Agency's flood risk assessment planning guidance. In practice that means pairing the national datasets with site-specific analysis. The data is the baseline evidence, not the finished assessment.

What are Environment Agency flood data "products"?

When a site needs more detail than the public map provides, Environment Agency flood data is obtained through formal data requests known as "Products". Each Product is a structured data package, and the numbering tracks an increasing level of technical detail, from a basic map extract up to the raw inputs of a hydraulic model.

• Product 1 — Flood Map for Planning extract. A copy of the Flood Map for Planning and the planning constraints for your site. Free to download.
• Product 4 — detailed FRA mapping and datasets. Modelled flood extents and levels, defences, historic records and breach or residual risk where held. The core technical input to most FRAs, and the one most people mean when they say they need "the EA data".
• Product 5 — model reports. The methodology, assumptions and limitations behind a hydraulic model.
• Product 6 — hydraulic model outputs. Raw model results: flood levels, depths and velocities, for detailed interrogation and design.
• Product 7 — hydraulic model inputs. The building blocks of the model: topographic data and boundary conditions.

Products 1 and 4 are the two most people encounter: a Flood Map for Planning extract and the detailed FRA dataset. Products 5, 6 and 7 sit underneath, exposing the hydraulic model itself for more complex or higher-risk sites. Products 2 and 3 cover historic and reservoir data respectively and are rarely requested for planning.

What is Product 4 flood data?

Product 4 flood data is the detailed Environment Agency dataset that forms the core technical input to most Flood Risk Assessments. It gives a far more site-relevant picture than the public Flood Map for Planning, which is why the majority of planning applications lean on it.

• Detailed modelled flood extents. The outlines of flooding for different annual probabilities.
• Flood levels where available. Modelled water levels used to set design flood levels and finished floor levels.
• Flood defence information. Where defences exist, their standard and the breach hazard behind them.
• Historic flood records. Evidence of past events affecting the site.
• Breach and residual risk. Included where the Environment Agency holds it.

Because Product 4 depends on existing modelling, its quality varies by location. In some areas the data is thin or based on older models, so further assessment or updated modelling may still be needed, which is exactly where professional interpretation earns its keep, as we set out in why expertise matters in flood risk assessments.

What are Product 5, 6 and 7 flood data?

Products 5, 6 and 7 relate to the detailed hydraulic model behind the flood mapping. They are typically needed for more complex or higher-risk developments: large or strategic sites, defended areas, or schemes that could affect floodplain storage or flow routes.

What a submitted model has to demonstrate, and the role of flood modelling within an assessment, turns on whether an existing model is suitable and up to date, a judgement that needs the model report and inputs, not the headline outputs alone.

What is the difference between Product 4 and Product 6?

The difference between Product 4 and Product 6 trips people up more than any other part of this. Put simply, Product 4 gives you interpreted, extracted data ready to use in an assessment, while Product 6 gives you the raw model outputs to interrogate yourself.

Product 4 supports a site-level Flood Risk Assessment; Product 6 supports detailed modelling, validation and design.

Product 4 is enough for many standard planning applications. Product 6 comes in where a scheme needs precise flood level justification, floodplain compensation or an impact assessment. It usually travels with Product 5 (the model report) and Product 7 (the inputs), so the model can be understood and rerun rather than taken on trust.

Why is Environment Agency flood data often required for a Flood Risk Assessment?

Environment Agency flood data is not always strictly mandatory, but it is frequently required in practice to support a robust planning submission, because it provides nationally recognised evidence that aligns with what the Environment Agency and local authorities expect to see.

• Recognised baseline. It is the nationally consistent dataset planners and statutory consultees work from.
• Expectation alignment. It matches Environment Agency and local authority review standards, which lowers the risk of a data-based objection.
• Evidence consistency. It keeps a site assessment consistent with the published flood risk picture.

The planning guidance is clear that applicants should use the best available information, and for many sites that means obtaining Environment Agency flood data products to underpin the assessment. The Environment Agency's wider role as a statutory consultee is explained in our guide to the Environment Agency in flood risk planning.

How long does it take to get Environment Agency flood data, and how do you request it?

Environment Agency flood data is obtained through a formal request, and for the detailed products the Environment Agency works to a service window of up to 20 working days. Some requests come back faster, but many run to the full window, particularly where modelling data or several datasets are involved.

On a live programme, up to 20 working days for detailed data can be a material delay, especially where design decisions are waiting on it.

1. Product 1. Download the Flood Map for Planning extract for your site directly from the GOV.UK Flood Map for Planning service.
2. Product 4. Enter your name and email against your development site on the same service and submit the request; the local Environment Agency team returns Product 4 within 20 working days.
3. Products 5, 6 and 7. Find the contact details for the relevant local Environment Agency office and send the request directly to them.

Reducing delays in accessing Environment Agency flood data

Programme risk at planning stage is often driven by the time needed to obtain and review Environment Agency flood data. Where a consultant already holds licensed Environment Agency model data, that delay can sometimes be shortened or avoided.

Unda licences and maintains access to a large proportion of Environment Agency hydraulic models. Where the relevant data is already held, we can review a site at the very start of a project without waiting for a formal data request, which shortens early feasibility, cuts uncertainty when assessing constraints, and helps avoid delays through submission and determination.

What are the limitations of Environment Agency flood data?

Environment Agency flood data is authoritative, but it has real limitations, and treating it as the final answer rather than a starting point is a common and costly mistake.

• Broad-scale modelling. National datasets may miss local topography, drainage infrastructure, smaller watercourses or recent land-use change.
• Variable age and resolution. Models differ in age, resolution and underlying assumptions across the country.
• Climate change allowances. Older data may not reflect current climate change allowances.
• Not the whole picture. Flood Zones map river and sea risk only; surface water, groundwater and drainage are assessed separately.

Why Environment Agency data still needs interpretation

A Flood Risk Assessment is not a data exercise. It takes technical interpretation, analysis and the integration of several datasets into a coherent picture of risk at one specific site.

Environment Agency flood data is often supplied in formats that need specialist tools to open and read. The detailed products, particularly 4, 5, 6 and 7, include spatial files and modelling outputs that have to be handled in Geographic Information Systems and hydraulic modelling software, as explained in our guide to flood modelling software tools and techniques. Without those tools, and the experience to apply them, there is a genuine risk of misreading the data or missing a constraint that matters.

Frequently asked questions

Understanding Environment Agency flood data is only half the job; applying it correctly within a planning context takes site-specific analysis and a clear read of policy. Unda helps developers, landowners and planning teams use Environment Agency flood data properly, from early feasibility through to detailed Flood Risk Assessments for planning. If you need to understand the flood constraints on a site or move an application forward, get in touch with Unda to talk it through.