Guidance on development and flood risk

Statutory consultation

The Flood and Water Management team at Suffolk County Council, is a statutory consultee for surface water drainage proposals for major developments This is part of our responsibility as the Lead Local Flood Authority (LLFA) under the Town and Country Planning Order 2015.

The revised National Planning Policy Framework, December 2023 (NPPF), Section 175, requires that all major development incorporates Sustainable Drainage Systems unless there is clear evidence that this would be inappropriate.

The definition of major development is:

• the number of dwellings to be provided is 10 or more, or the development is to be carried out on a site having an area of 0.5 hectares or more (and it is not known if 10 or more dwellings are to be provided)
• the provision of a building or buildings where the floor space to be created by the development is 1,000 square metres or more.
• Development carried out on a site having an area of 1 hectare or more.
• any minor applications in areas at risk of surface water flooding. You can determine whether a site may be at risk of surface water flooding using these maps created by the Environment Agency

We would encourage developers to contact us as early as possible in the planning process for advice on how to create an application which meets minimum operational standards and is beneficial for all concerned organisations and individuals.

Pre-application advice

SuDS planning advice should be sought from Suffolk County Council as early as possible in the planning process. For developments within the Babergh & Mid Suffolk District Councils and West Suffolk Council areas, SuDS pre-application advice is provided through the relevant Local Planning Authority pre-application service. Information on fees, timescales and how to apply can be found on the relevant council webpages below:

• Babergh and Mid Suffolk District Councils
• West Suffolk Council

For developments within the East Suffolk Council or Ipswich Borough Council areas, or where SuDS advice is required outside of the planning process anywhere in Suffolk, Suffolk County Council offers a direct pre-application advice service. Information on fees, timescales and how to apply is available on Suffolk County Council's SuDS pre-application advice service.

Suffolk Flood Risk Management Partnership

The Suffolk Flood Risk Management Partnership is a professional, multi-agency partnership overseeing the operational delivery of flood risk management across the county. It has created a number of useful documents which clarify what is required of developers and why. The first of these is the Suffolk Flood Risk Management Strategy which can provide developers some context into flood management for Suffolk on a larger scale, including key links to and extracts from key national guidance documents.

Suffolk Flood Risk Management Strategy

You can read the full Flood Risk Management Strategy. The appendices below are supporting documents for this strategy, some appendices have since been updated (B & D), made as standalone documents (E & F) or removed (C). Appendix C Protocol for Local Planning Authorities and Developers on SuDS, Surface Water Drainage and Local Flood Risk in Suffolk, is withdrawn as it is no longer required. The LLFA policy of dealing with applications is now well established and briefly summarised within the SFRMS main document.

Local validation lists

Under the National Planning Policy Framework (NPPF) and local validation lists set by each local planning authority (LPA), developers will be required to fill out a number of different documents before their application can be registered. For flooding and drainage related matters these include:

• A Flood Risk Assessment (FRA) when defined as necessary by the protocol, to demonstrate the flood risk to, and resulting from, the development and to demonstrate the safety of the development for its lifetime
• An asset collection sheet which allows us to capture new flooding and drainage assets as they are built. Another of our responsibilities as the LLFA is to create and maintain a Flood Risk Asset Register, and this information will assist that.

Some applications may also require land drainage consents. Please see our information which outlines how you can obtain permission to work on a watercourse.

Other helpful resources

We have developed a piece of standing advice for Solar Panels (PV) and Solar Farms and how we expect to see flood risk and surface water drainage being managed.

Our Surface Water Management Plans (SWMPs) are available online via the Green Suffolk website.

Anglian Water's policy for SuDS and details of their pre-planning services are available online.

Suffolk County Council and Anglian Water have worked together to form the Suffolk SuDS Palette which helps developers and architects design SuDS systems which are in-keeping with the wider Suffolk landscape.

We have produced a Construction Surface Water Management Plan template for developers to use during the planning process. This document will guide developers, ensuring that you can submit the correct information first time therefore reducing unnecessary delays. You can find it on our Construction Surface Water Management Plan web page.

To find out whether there are existing flooding issues in the area you want to develop, you can request a flood map from the Flood and Water Management Team.

There is also comprehensive national SuDS guidance available, published by CIRIA, which details technical specifications for all sustainable drainage systems. To compliment this guidance CIRIA has also produced a number of helpful videos via susdrain, which outline the basics in delivering SuDS.

Suffolk's Preliminary Flood Risk Assessment (PRFA) is available to view online.

Suffolk Resilience Forum has plenty of information to assist LPAs and developers in ensuring their proposals meet the requirements for building on a flood plain.

A video of a presentation given to LPAs regarding the use of SuDS is available to view publicly.