Lewes District Council
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Planning Policy
Lewes District Council
Southover House
Southover Road
Lewes
East Sussex
BN7 1AB
Tel: 01273 484417
ldf@lewes.gov.uk
Minicom 01273 484488
Strategic Flood Risk Assessment
Faber Maunsell (now known as Aecom) was commissioned to produce the Strategic Flood Risk Assessment (SFRA) for the district.
SFRAs are intended to guide development decisions, both individual and strategic though the Local Development Framework. The Assessment was prepared in accordance with Planning Policy Statement 25 (PPS25): Development and Flood Risk and its Practice Guide Companion and with the support of the Environment Agency and Southern Water.
The SFRA is to be used as a tool for assessing flood risk from various sources of flooding: fluvial, tidal, groundwater, sewers, surface water and infrastructure failure. It does not in itself determine whether any given land use is acceptable for any given site as it does not take into consideration other relevant material planning considerations. The aim is to avoid inappropriate development in areas at risk of flooding and make areas safe without increasing risk elsewhere where new development is, exceptionally, necessary in flood risk areas. Steering development away from the highest flood zones comes under the scope of the Sequential Test, which is a key element of PPS25.
The Assessment is made up of two stages: Level 1 and Level 2. Level 1 is primarily a desk based study which involved:
- the collection and collation of data and information;
- Producing strategic flood risk maps, Geographical Information System (GIS) maps and plans, technical report;
- Providing suitable and relevant guidance for site specific Flood Risk Assessments (FRAs)
Level 2 offers a more detailed study and is used to facilitate the application of the Exception Test, taking into account the presence of flood risk management measures such as flood defences. Level 2 SFRAs should contain:
- An appraisal of the current condition of the flood defence infrastructure
- An appraisal of the probability and consequences of overtopping or failure of flood risk management infrastructure
- Maps showing distribution of flood risk across zones
- Guidance relevant to the Exception Test and the preparation of FRAs
Clarification
Since the completion of the Strategic Flood Risk Assessment (SFRA) in October 2009, a revised version of Planning Policy Statement 25: Development and Flood Risk (and its associated practice guide) has been issued (March 2010). Amongst other things, the revisions have clarified the definition of functional floodplain (Flood Zone 3b) stating that:"Developed areas are not generally part of the floodplain. Only water compatible and essential infrastructure are considered suitable development types in the functional floodplain" (para. 4.91 of Planning Policy Statement 25 Practice Guide).
As a result of this clarification, currently developed areas in the District identified in the SFRA as being in the functional floodplain (Flood Zone 3b) are considered, following consultation with the Environment Agency, as being in Flood Zone 3a unless expressly stated otherwise.
The report is accompanied by over 200 maps. Due to the file sizes of these maps only a selection of ‘critical’ maps are provided on the Council’s website (see below). If you require other maps please contact the Policy Team Clerk Vanessa Jarvis or 01273 484417.
| Strategic Flood Risk Assessment Documents and Maps | ||
| SFRA Final Version October 2009: Report, references and glossary |
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| SFRA Final Version October 2009: Appendices A - C |
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| SFRA Final Version October 2009: Appendix D |
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| SFRA Final Version October 2009: Appendix E Part 1 |
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| SFRA Final Version October 2009: Appendix E Part 2 |
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| SFRA Final Version October 2009: Appendix F |
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| SFRA Sequential Test and Exception Test Methodology |
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| Flood Risk Zone Maps | ||
| 002 Flood Risk Zones S1 |
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| 002 Flood Risk Zones S2 |
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| 002 Flood Risk Zones S3 |
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| 002 Flood Risk Zones S4 |
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| 002 Flood Risk Zones S5 |
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| 002 Flood Risk Zones S6 |
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| 002 Flood Risk Zones S7 |
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| 002 Flood Risk Zones S8 |
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| 002 Flood Risk Zones S9 |
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| 002 Flood Risk Zones S10 |
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| 002 Flood Risk Zones S11 |
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| 002 Flood Risk Zones S12 |
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| Flood Defences Maps | ||
| 003 Flood Defences S7 |
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| 003 Flood Defences S12 |
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| Historic Flooding Maps | ||
| 004 Historical Flooding S7 |
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| 004 Historical Flooding S9 |
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| 004 Historical Flooding S10 |
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| Lewes Flood Cell 4 Maps | ||
| LFC4 5 Existing Defences 100yr and CC Max Depth |
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| LFC4 5 Existing Defences 100yr Max Depth |
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| LFC4 5 Raised Defences 100yr and CC Max Depth |
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| LFC4 5 Raised Defences 100yr Max Depth |
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| LFC4 5 Undefended 100yr Max Depth |
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| Newhaven Flood Cell 4 Maps | ||
| NFC4 Existing Defences 2007 2yr F and 200yr T Max Depth |
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| NFC4 Existing Defences 2115 200yr T Max Depth |
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| NFC4 Raised Defences 2007 2yr F 200yr T Max Depth |
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| NFC4 Raised Defences 2115 200yr T Max Depth |
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| NFC4 Undefended 2007 2yr F and 200yr T Max Depth |
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