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Strategic flood risk assessment

Explains what a strategic flood risk assessment is, are Level 1 and Level 2 SFRA's prepared, guidance available and what is the sequential and exceptions test. 

What is a Strategic Flood Risk Assessment (SFRA)?

A Strategic Flood Risk Assessment, or SFRA, is part of the evidence base for the Local Plan and collates information on all known sources of flooding that may affect existing or future development within our area. Such sources include tidal, river, surface water (local drainage), sewers and groundwater.

In collecting this information, the SFRA identifies and maps areas that have a ‘low’, ‘medium’ and ‘high’ probability of flooding within the East Riding, in accordance with national policy.

Within the flood affected areas, the SFRA recommends appropriate land uses that will not unduly place people or property at risk of flooding. Where flood risk has been identified as a potential constraint to future development, the SFRA recommends possible flood mitigation solutions that may be integrated into the design (by the developer) to minimise the risk to property and life should a flood occur.

The East Riding Flood Data Map contains information from the SFRA alongside Environment Agency Web Map Services. The interactive map offers more flexibility to users, however for technical reasons some of the icons and colours on the map do not exactly match those in the paper copies. Please refer to the appropriate legend for each feature. 

Has the council prepared a Level 1 SFRA?

Yes. The Level 1 SFRA was approved by Cabinet on 26 November 2019. The written report is available to download here along with the Appendices.

Environment Agency Flood Maps (external website)  

Main Report

Strategic Flood Risk Assessment (Level 1) - Main Report (pdf 3.55mb) 

Appendix A - Study Area Overview

Appendix A - Study Area Overview (pdf 4.46mb)

Appendix B - Development Locations

Appendix B -Development Locations (pdf 4mb)

Appendix C - Flood Risk from Rivers and Sea

Appendix C - Flood Risk from Rivers and Sea (pdf 4.8mb)

Appendices D - Flood Risk from Surface Water    

Appendix D - Flood Risk from Surface Water (pdf 6.25mb)

Appendix E - Flood Risk from Ground Water

Appendix E - Flood Risk from Ground Water (pdf 3.83mb)

Appendix F - Reservoirs and Canals

Appendix F - Reservoirs and Canals (pdf 3.69mb)

Appendices G - Assets and Flood Defences

Appendix G - Assets and Flood Defences (pdf 3.65mb)

Appendix H - Historic Flooding Events

Appendix H - Historic Flooding Events (pdf 4.18mb)

Appendix I - Flood Warning Service Coverage

Appendix I - Flood Warning Service Coverage (pdf 4.13mb)

Appendices J - Sequential Test Requirement

Appendix J - Sequential Test Requirement (pdf 4.12mb)

Appendix K - Site Specific Flood Risk Assessment Requirement

Appendix K - Site Specific Flood Risk Assessment Requirement (pdf 4.46mb)

Appendix L - Flood Risk Assessment Template

Appendix L - Flood Risk Assessment Template (doc 67kb)

Has the council prepared a Level 2 SFRA?

The Council are currently undertaking Level 2 Strategic Flood Risk Assessments for Goole and Hedon. The Level 1 SFRA (2019) recommends a number of spatial planning and development management recommendations including the undertaking of more detailed ‘Level 2’ flood risk assessments in Goole and Hedon, which are considered to be at particular risk from flooding. 

 Also, a Goole Level 2 SFRA was approved by Cabinet on 5 July 2011. It was been prepared in accordance with national planning policy (PPS 25), enabling the Council and developers to take into account theoretical ‘worst case’ flooding scenarios when proposing/determining development. It maps ‘residual’ flood risks that could occur as a result defence overtopping (in a ‘1 in 200 year’ tidal flood event) using both current and future tide-level predictions, and defence breaches. Importantly, the Level 2 SFRA confirms that the Environment Agency is committed to maintaining and improving the town’s flood defences into the future, thus mitigating the risk of overtopping. The key residual risk to Goole therefore is the risk of a breach(es), which can never be fully eradicated. 

The principal SFRA maps are Figures N (Combined Breach Hazard) and O (Combined Breach Depths)

These identify the relevant hazard classification for a site and appropriate design/mitigation measures. The Flood Risk Note for the Planning Application Process provides further guidance on how to use the Level 2 SFRA in preparing planning applications / site-specific flood risk assessments.

Level 2 SFRA - Goole (pdf 700kb) 

Breach Maps

Figure O - Combined breach depth map (pdf 11.0mb)

Figure N - Combined breach hazard map (pdf 13.8mb)  

Figure M - Rate of ingress map (pdf 493kb) 

Overtopping Maps

Figure A1 - Defence overtopping depth map (jpg 500kb)

Figure A2 - Defence overtopping hazard map (jpg 491kb)

Figure B1 - Defence overtopping depth map plus climate change (jpg 635kb)

Figure B2 - Defence overtopping hazard map plus climate change (jpg 589kb)

Is there any guidance available on how to use the SFRA and the application of the flood risk policy?

Yes. A note has been prepared to provide assistance to developers, applicants, and Local Planning Authority officers on how to use the council’s Strategic Flood Risk Assessment and how to apply flood risk policy in the East Riding of Yorkshire. It aims to promote transparency and consistency in the approach East Riding of Yorkshire Council will take to applying the flood risk Sequential and Exception Tests. 

The note was last updated in 2017 to reflect the adoption of the East Riding Local Plan and to incorporate best practice and will be review with the publication of the SFRA (Level 1) 2019.

Flood Risk guidance note (pdf 1mb)  

The note is not a formal supplementary planning document.

In addition to the above, the council has also prepared a planning note and standing advice on how sustainable drainage systems (SuDS) should be taken into account in new developments. The note provides guidance on how the Government's standards for SuDS and surface water drainage will apply in the East Riding. The note can be accessed on our design of surface water drainage systems page.

What is the Sequential Test?

The primary objective of planning policy in respect of flood risk, is to steer vulnerable development towards areas of lowest flood risk. The National Planning Policy Framework advocates a sequential approach that will guide the planning decision-making process (i.e. the allocation of sites). In simple terms, this requires planners to seek to allocate sites for future development within areas of lowest flood risk in the initial instance. Only if it can be demonstrated that there are no reasonably available sites within these areas should alternative sites (i.e. within areas that may potentially be at risk of flooding) be contemplated. This is referred to as the Sequential Test.

What is the Exceptions Test?

Many towns within England are situated adjacent to rivers, and are at risk of flooding. The future sustainability of these communities relies heavily upon their ability to grow and prosper. The National Planning Policy Framework (NPPF) recognises that, in some areas, including the East Riding, restricting residential development from areas designated as Zone 3a (High Probability) may compromise the viability of existing communities within the region.

For this reason, the NPPF provides an Exception Test. Where a local planning authority has identified that there is a strong planning based argument for a development to proceed following the application of the Sequential Test, it will be necessary for the Council to demonstrate that the Exception Test can be satisfied.

For the Exception Test to be passed:

  • it must be demonstrated that the development provides wider sustainability benefits to the community that outweigh flood risk, informed by a Strategic Flood Risk Assessment where one has been prepared; and
  • a site-specific flood risk assessment must demonstrate that the development will be safe for its lifetime taking account of the vulnerability of its users, without increasing flood risk elsewhere, and, where possible, will reduce flood risk overall.