At Flood Survey, we provide detailed and fully compliant flood risk reports for properties and development sites in Portsmouth and across the UK.

Whether you are preparing a planning application, buying land, or protecting an existing property, our surveys assess the level of flood risk and provide targeted mitigation recommendations.

Flood Survey combine in-depth local expertise with national guidelines to ensure your report meets the standards required by planning authorities, the Environment Agency, and potential investors.

Why Is a Flood Survey Required in Portsmouth?

A flood survey in Portsmouth is often a legal requirement for developments located in or near designated flood zones, or where local drainage capacity is limited.

The survey provides planning authorities in Portsmouth with a clear picture of how a proposed development will address potential flood risks without creating negative impacts for surrounding properties, ensuring compliance and safety.

Which Types of Developments in Portsmouth Require a Flood Survey Report?

We prepare flood survey reports in Portsmouth for a wide range of developments where planning regulations require them, including:

• Developments within Flood Zones 2 or 3 – Areas with a higher risk of flooding from rivers or the sea.
• Sites over one hectare in size – Regardless of official flood zone classification.
• Projects near rivers, reservoirs, or coastal areas – Where proximity to water increases flood potential.
• Locations with a history of surface water flooding – Even if outside mapped flood zones.
• Developments where the local planning authority specifies a report – As part of the planning approval process.

How Much Does a Flood Survey Cost in or Around Portsmouth?

The cost of a flood survey in Portsmouth ranges from £400 to over £1,600, depending on the site size, location in a flood zone, and the complexity of the assessment.

Pricing is influenced by factors such as the need for hydraulic modelling, the availability of historic flood data, site-specific drainage evaluations, and any additional inspections or recommendations.

Contact Flood Survey in Hampshire to get a tailored quote for your property.

How Do Flood Surveyors in Portsmouth Assess a Site’s Flood Risk Level?

Our flood surveyors in Portsmouth use Environment Agency data, local authority records, and detailed on-site inspections to accurately determine flood risk.

We examine ground elevations, drainage capacity, and hydrological patterns to assess how the site in Portsmouth may be affected during extreme weather events. Where needed, advanced hydraulic modelling is used to simulate realistic flood scenarios and identify potential vulnerabilities.

Are Flood Surveys in Portsmouth Needed for Planning Applications?

In many parts of Portsmouth, a flood survey report is an essential part of the planning application process, particularly for developments in identified flood zones or areas with drainage challenges.

Providing a compliant report can improve the likelihood of planning approval by showing that the development will be managed with effective flood risk controls.

Can a Flood Survey in Portsmouth Recommend Mitigation Measures?

Our flood surveys in Portsmouth not only assess the potential level of flood risk but also include practical recommendations to reduce it, which involve raising floor levels, installing flood defences, upgrading drainage systems, or incorporating sustainable drainage solutions (SuDS).

Such measures help meet planning requirements in Portsmouth and protect the property in the long term.

How Long Does It Take to Complete a Flood Survey in Portsmouth?

For standard residential sites, a flood survey in Portsmouth can generally be completed within one to two weeks.

Larger or more complex projects in Portsmouth requiring detailed hydraulic modelling may take longer. We work within agreed timelines to ensure your planning application remains on track.

What Information Is Included in a Flood Survey Report for the Portsmouth Area?

A typical flood survey report for a Portsmouth site includes:

• Flood zone mapping – Showing the site’s position within official Environment Agency flood zones.
• Historic flood records – Reviewing past flooding events and their impact on the location.
• Topographical analysis – Assessing land gradients and levels to understand water flow.
• Identification of flood sources – Including rivers, tidal waters, groundwater, and surface water run-off.
• Flood modelling – Predicting water depths and velocities for various return periods.
• Drainage capacity assessment – Evaluating current systems and their performance.
• Mitigation recommendations – Proposing measures to reduce residual flood risk.

Do Flood Survey Reports in Portsmouth Comply With Regulatory Standards?

All our flood survey reports in Portsmouth are prepared in line with Environment Agency standing advice, Planning Policy Statement (PPS25) guidance, and the requirements of local planning authorities. This ensures they meet the technical and compliance standards necessary for acceptance.

Contact Flood Survey in Portsmouth today to arrange your assessment.

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