Flood Mitigation Options Appraisal & Strategy For Planning Permission and Flood Management
A Flood Mitigation Options Appraisal & Strategy is a structured, site-specific assessment that identifies all feasible mitigation measures, evaluates their effectiveness, and sets out a preferred strategy for reducing flood risk. This process ensures compliance with national planning policy, supports safe and sustainable design, and gives decision-makers confidence that your development is resilient.
A well-prepared Flood Mitigation Options Appraisal and Strategy demonstrates that flood risk has been considered and addressed in line with national policy, helps satisfy planning conditions and avoid delays or objections, supports safe, resilient design that protects future occupants and property, and provides a clear audit trail for decision-making.
When Is a Flood Mitigation Options Appraisal & Strategy Required?
You may be asked to submit a Flood Mitigation Options Appraisal and Strategy if your site lies within Flood Zone 2 or 3 or is at risk from surface water, the proposed development includes sleeping accommodation at ground level, the Environment Agency or Local Planning Authority requests further evidence of mitigation, you're proposing to convert or extend buildings in flood-prone areas, or finished floor levels cannot be raised due to design or access constraints. Flood Mitigation Options Appraisals are often required alongside or following a Flood Risk Assessment, particularly where the development is complex or where multiple mitigation options are available.
Ask a question →What Does a Flood Mitigation Options Appraisal & Strategy Include?
A Flood Mitigation Options Appraisal and Strategy typically include a review of flood risks, based on the findings of a Flood Risk Assessment and Environment Agency modelling data; identification of feasible mitigation options such as permanent resistance, temporary resistance, and resilience measures; assessment of site constraints including structural limitations, access, and planning restrictions; evaluation of each option considering effectiveness, practicality, cost, and regulatory compliance; a preferred mitigation strategy with clear justification for the selected approach; recommendations for further investigation such as structural surveys or design amendments; and supporting evidence including flood depth modelling, topographical data, and site plans.
Our flood mitigation strategies are tailored to the specific site and development, ensuring they are proportionate, technically sound, and easy for planners or contractors to interpret.
Case Study - In a recent Flood Mitigation Options Appraisal and Strategy for a residential conversion in Tonbridge, Kent, we identified that the site lay within Flood Zone 3, with modelled flood depths up to 0.62m. Using Environment Agency Product 4 data and LiDAR topography, we mapped flood extents across the site and determined that raising finished floor levels was not viable due to the nature of the conversion. We evaluated permanent resistance measures such as flood-resistant doors and windows, temporary barriers, and internal access to upper floors. Our recommended strategy combined water-resistant doors and windows, anti-backflow valves, and reconfigured access routes to ensure safe egress. We also advised a structural survey to confirm the building could withstand flood pressures. This approach allowed the client to demonstrate a clear, site-specific mitigation strategy, satisfying planning conditions and supporting safe development.
Contact us →Meet Our Flood Risk Consultants
Louis Turner, Technical Director - Having graduated from the University of Nottingham with a degree in Environmental Science, Louis is recognised for his technical leadership and precision in environmental consultancy. Louis provides strategic oversight across all service areas, ensuring projects meet the highest standards of compliance, accuracy, and environmental responsibility. Louis leads the preparation of flood risk assessments, combining hydrological data, modelling, and site-specific analysis to evaluate potential hazards. His reports provide robust guidance for planning applications, helping clients mitigate flood risks and comply with Environment Agency and local authority standards.
Joe Turner, Operations Director - Providing practical expertise and a client-focused approach, Joe ensures that every project is delivered quickly, efficiently, and without unnecessary hassle. He has successfully managed a wide variety of project types across the consultancy, bringing a wealth of operational knowledge and a reputation for keeping projects on track. Joe's leadership guarantees a smooth process for clients, from initial enquiry through to final reporting. Joe manages the operational side of flood risk assessments, ensuring hydrological modelling and reporting are completed promptly and accurately. His oversight guarantees that clients receive clear, actionable guidance to satisfy planning conditions and mitigate flood hazards.
Richard Turner, Director - With over 30 years of experience in site development, he provides invaluable insight into pragmatic solutions that balance costs, practicalities, and client objectives. Richard has a detailed understanding of building regulations and a clear sense of what is and isn't possible on site, making him a trusted advisor for developments of all sizes. Richard's background in site development allows him to assess flood risk with a pragmatic eye, ensuring that proposed mitigation measures are realistic, cost sensitive, and suitable for the specific site conditions.
Request A Flood Mitigation Options Appraisal & Strategy
Contact us for an informal discussion about your requirements or, if your requirements are more complex, a more formal consultation may be necessary. Following initial consultation we can provide an outline proposal detailing how we can help and the costs involved. If you're looking for more information about our services or our company then complete the below contact form and we will endeavour to respond to your enquiry in a timely manner, alternatively, give us a call on 0800 433 2906 and our experienced consultants can provide actionable advice and guidance.
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References
British Geological Society. BGS GeoIndex
Environment Agency. Flood map for planning
Environment Agency. Flood risk and coastal change
Environment Agency. Flood risk assessments: applying for planning permission