. Poole Local Plan

Managing Flood Risk Revised Strategic Flood Risk Assessment Levels 1 and 2

November 2017

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 2 Contents

1. Introduction ...... 4 Part 1: Level 1 Strategic Flood Risk Assessment ...... 7 2. Policy Context ...... 9 3. The Borough of Poole Study Area ...... 11 4. Flood Risk ...... 13 Sources of Flood Risk ...... 13 Flood Zones ...... 13 Historic Flooding in Poole ...... 22 Coastal Change ...... 25 5. Flood Management and Mitigation ...... 27 Flood Defences ...... 27 Poole Bay, Poole Harbour and Wareham Flood and Coastal Erosion Risk Management – Final Strategy (December 2014) ...... 31 Local Flood Defence Schemes ...... 31 6. Development Management ...... 35 Residual Flood Risk ...... 36 Emergency Planning ...... 37 Flood Warning Areas ...... 38 Flood Risk Assessments ...... 40 Sustainable Urban Drainage Systems (SuDS) ...... 40 7. Climate Change ...... 43 8. Flood risk assessment of potential development sites in Poole ...... 45 Summary ...... 48 Part 2: Level 2 Strategic Flood Risk Assessment ...... 49 9. The need for a Level 2 Strategic Flood Risk Assessment ...... 50 Application of the Sequential Test - Central Poole Area ...... 50 Analysis of housing capacity in Poole ...... 51 Application of the Exception Test ...... 55 Flood Defences ...... 56 Analysis of Flood Risk within the Poole Town Centre and Twin Sails regeneration area Sequential Test application area – current day to 2133 ...... 57 Summary conclusions ...... 64 Sequential Test of other site allocations ...... 65 Application of the Sequential Test and Exception Test outside of the Town Centre study area ...... 65 10. Glossary of Terms ...... 66 Appendix 1 - Flood Risk Vulnerability Classification ...... 68 Appendix 2 - Site Assessment Flood Risk Summary ...... 69 Appendix 3 – Nature and condition of flood defences and coastal erosion protection structures in Poole...... 72 Appendix 4 – Areas in Poole at future risk of tidal flooding by 2133 ...... 73 Appendix 5 – Flood risk scenarios for the Town Centre and Twin Sails regeneration area: Current day to 2133 ...... 75

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 3 1. Introduction 1. It is predicted that as a consequence of climate change, the incidence and severity of flooding will increase over time as a result of rising sea levels and more frequent severe storms that bring higher intensity rainfall and increased run-off from land and buildings. This will result in increased vulnerability of Poole’s coastal and harbour areas to the risk of tidal flooding and to other areas of the borough from rivers, streams and watercourses as higher flows and levels, as a consequence of storm events, cause sewers and drains to exceed capacity more frequently than at present. 2. Opportunities for growth in Poole are constrained due to the coast and harbour to the south, internationally designated heathland habitats and Green Belt to the north and west, whilst to the east the Borough merges seamlessly with Bournemouth. Within this context, the town centre including the Twin Sails regeneration area, areas at risk of tidal flooding, provide the most sustainable opportunities for significant development to meet future needs for housing and employment. Consideration of flood risk is therefore key to Poole’s strategy for the delivery of growth over the coming years. 3. As the assessment of the risks associated with flooding is an ongoing process, it is appropriate that SFRA documents are reviewed and updated as necessary. The review of Poole’s currently adopted development plan documents, primarily the Poole Core Strategy (adopted February 2009); Poole Site Specific Allocations and Development Management Policies DPD (adopted April 2012) and Delivering Poole’s Infrastructure DPD (adopted April 2012), provides such an opportunity. 4. This document therefore provides an update to the Strategic Flood Risk Assessment (SFRA) for Poole, incorporating both Level 1 and 2 requirements.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 4 What is Strategic Flood Risk Assessment? 5. Planning Practice Guidance (March 2014), defines a Strategic Flood Risk Assessment (SFRA) as:- “a study carried out by one or more local planning authorities to assess the risk to an area from flooding from all sources, now and in the future, taking account of the impacts of climate change, and to assess the impact that land use changes and development in the area will have on flood risk.” 6. The aim of a SFRA is to reduce the risk to people and both the built and natural environment from flooding. It does this by discouraging further development within areas at high risk of flooding and by providing guidance for the control of surface water run-off. 7. A SFRA provides information on flood risk issues and assesses the different levels, extent and nature of flood risk and flooding, and maps this to assist with the preparation of local development plan documents and in the assessment of planning applications. 8. The SFRA is used to:-  determine the variations in risk from all sources of flooding across an area, and also the risks to and from surrounding areas in the same flood catchment;  inform the sustainability appraisal of a Local Plan, so that flood risk is fully taken into account when considering allocation options and in the preparation of plan policies, including policies for flood risk management to ensure that flood risk is not increased;  apply the Sequential Test and, where necessary, the Exception Test when determining land use allocations;  identify the requirements for site-specific flood risk assessments in particular locations, including those at risk from sources other than river and sea flooding;  determine the acceptability of flood risk in relation to emergency planning capability; and  consider opportunities to reduce flood risk to existing communities and developments through better management of surface water, provision for conveyance and of storage for flood water. The requirement for Strategic Flood Risk Assessment? 9. The NPPF states that:- “Local Plans should be supported by Strategic Flood Risk Assessment and develop policies to manage flood risk from all sources, taking account of advice from the Environment Agency and other relevant flood risk management bodies….”.1 10. There are two levels of Strategic Flood Risk Assessment that reflect the likely risk of flooding from all sources and development pressures, these being:-  Level 1 – required to be undertaken by all local authorities, a Level 1 SFRA should:- o examine the risk of flooding within the area of study; o provide an assessment of potential flooding from all sources; and o include an allowance for climate change.  Level 2 – required where development is needed within flood zones 2 and 3 (defined on Environment Agency mapping), as land outside flood risk areas can’t accommodate all the necessary development and the National Planning Policy Framework’s Exception

1 National Planning Policy Framework (March 2012): Paragraph 100 – page 23. Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 5 Test needs to be applied. In addition to the EA flood zones, modelling undertaken by the Borough of Poole has provided a projection of future flood risk to 2133 (100 years beyond the revised Local Plan timescale), that will be used to inform the allocation of sites for development and the determination of planning applications. 11. Since the adoption of Poole’s current development plan documents, national planning policy provided by Planning Policy Statement 25: Development and Flood Risk (Department of Communities and Local Government (DCLG) (2006), has been replaced by the National Planning Policy Framework (NPPF) (March 2012). Further detailed guidance on flooding is provided by Planning Practice Guidance (PPG) (March 2014). 12. This updated SFRA will form a crucial part of the Council’s evidence base by:-  informing the Sustainability Appraisal process;  identifying appropriate locations for development and, where necessary, applying the Sequential Test and Exception Test to those sites needed to meet Poole’s future development needs lying within areas of flood risk; and  providing the context for developing Local Plan policy in respect of flood risk. It will also assist decision making in the Development Management process and will provide relevant guidance and advice for applicants in the preparation of Sequential Test and Exception Test evidence and Flood Risk Assessments supporting planning applications.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 6

Part 1: Level 1 Strategic Flood Risk Assessment

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 7 Strategic Flood Risk Assessment for Poole 13. A Level 1 SFRA for Poole was published in January 2009, and was prepared as part of the evidence base to inform the Poole Core Strategy (adopted February 2009). It established that development needs promoted through the Core Strategy, particularly housing, could not be wholly accommodated in areas of low flood risk. 14. As a consequence, a Level 2 SFRA, which followed on from the Level 1 assessment, facilitated a detailed application of the Sequential Test on Poole Town Centre and the adjacent Twin Sails regeneration area, where strategic sites needed to deliver significant elements of Poole’s future growth were located, in existing and future areas at high risk of flooding. The Level 2 SFRA was further supplemented by a Flood Risk Management Strategy (January 2011), the purpose of which was to:-  provide a strategic review of flood risk to 100 years beyond the end of the Core Strategy (i.e. 2126); and  establish a robust and defendable long term framework to inform decisions on flood risk and the provision of future improved flood defences. The need for an updated SFRA for Poole 15. There have been a number of significant changes to both flood risk management and planning policy since the publication of the Level 1 and 2 SFRA’s for Poole. These changes, together with the review of the Local Plan make a comprehensive update of the SFRA essential. Key changes include:-  publication of the Localism Act (2011); National Planning Policy Framework (March 2012) and Planning Practice Guidance (March 2014) - which replaced Planning Policy Statement 25 (PPS25) and the PPS25 companion Practice Guide;  a number of provisions of the Flood and Water Management Act 2010 and EU Flood Directive have been implemented, which have significant implications on roles and responsibilities of different organisations in relation to flood risk management;  the availability of new/updated mapping in relation to sources of flooding. It is important to ensure that the flood risk evidence base used for the Local Plan review is based on the most up to date information;  an updated Strategic Housing Market Assessment for Eastern Dorset, a key evidence base document, has identified a significant additional need for housing in Poole over the period 2013-2033;  new and updated flood risk policy documents are now available, including Catchment Flood Management Plans, Local Flood Risk Management Strategies and Poole’s Preliminary Flood Risk Assessment; and  changes to organisations, roles and responsibilities in relation to flooding.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 8 2. Policy Context Flood and Water Management Act 2010 16. The Flood and Water Management Act 2010 addresses the threat of flooding and water scarcity. Under the Flood Risk Regulations the Environment Agency is the government department responsible for managing flood risk from main rivers, reservoirs, estuaries and the sea. 17. Lead Local Flood Authorities (LLFAs) are responsible for local sources of flood risk, in particular surface run-off, groundwater and ordinary watercourses. Local authorities are responsible for ensuring that new requirements for Preliminary Flood Risk Assessments and the approval of sustainable drainage systems (SuDS) are met. 18. The Act requires the Borough of Poole, as a LLFA, to develop a Local Flood Risk Management Strategy to manage local flood risk. In compliance with this requirement, the Borough of Poole published its Local Flood Risk Management Strategy 2017-2019, in July 2017. National Planning Policy Framework (March 2012) 19. National planning policy on the challenges of climate change, flooding and coastal change is provided by the NPPF. The NPPF was accompanied by the publication of Technical Guidance which provided additional guidance to local planning authorities to ensure the effective implementation of planning policy set out in the NPPF, on development in areas at risk of flooding. It is recommended that NPPF Section 10: Meeting the challenge of climate change, flooding and coastal change, be read as a whole to fully understand the Government policy approach to flood risk. 20. The NPPF requires that Local Plans should be supported by SFRA’s when considering the location of new development and developing policies to manage flood risk. Supporting Planning Practice Guidance provides more information on the scope of SFRA’s and how they should be used in the plan-making process. 21. The preparation of Local Plans should take account of climate change over the longer term and new development should be planned to avoid increased vulnerability to the range of impacts arising from climate change. When new development is brought forward in areas which are vulnerable, care should be taken to ensure that risks can be managed through suitable adaptation measures2. 22. The NPPF sets strict tests to protect people and property from flooding, which all local planning authorities are expected to follow. Where these tests are not met, national policy is clear that new development should not be allowed. The main steps to be followed are set out below which, in summary, are designed to ensure that if better sites are available in terms of flood risk, and/or a proposed development cannot be made safe, it should not be permitted. The Sequential Test 23. The Sequential Test seeks to ensure that new development is steered to areas with the lowest probability of flooding (NPPF: para 101), with the aim of keeping development out of medium and high flood risk areas (Flood Zones 2 & 3), where possible. In addition to the present day flood risk mapping provided by the Environment Agency, the Borough of Poole has modelled future flood risk areas, taking into account climate change, to 100 years beyond the Local Plan review plan period i.e. 2133. A Sequential Test will therefore need to address future risk together with other sources of flooding.

2 National Planning Policy Framework (March 2012) – paragraph 99 (page 23). Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 9 24. Application of the Sequential Test helps ensure that development can be safely and sustainably delivered and developers do not waste time promoting proposals which are inappropriate on grounds of flood risk. 25. Further detailed guidance on the application of the Sequential Test is provided by PPG at http://planningguidance.communities.gov.uk/blog/guidance/flood-risk-and-coastal- change/applying-the-sequential-test-to-individual-planning-applications/ The Exception Test 26. If, following application of the Sequential Test it is not possible, consistent with wider sustainability objectives, for the development to be located in zones with a lower probability of flooding, the Exception Test can be applied, if appropriate. The Exception Test is the method employed to ensure that flood risk to people and property will be managed satisfactorily, while allowing necessary development to go ahead in situations where suitable sites at lower risk of flooding are not available. 27. Essentially, the Test requires that proposed development shows that it will provide wider sustainability benefits to the community that outweigh flood risk and that it will be safe for its lifetime, without increasing flood risk elsewhere and, where possible, reducing flood risk overall. PPG provides the relevant guidance on the Exception Test at:- http://planningguidance.communities.gov.uk/blog/guidance/flood-risk-and-coastal- change/the-exception-test/ 28. Both elements of the test will have to be passed for development to be allocated or permitted. Planning Practice Guidance (March 2014) 29. In March 2014, PPG. The section entitled ‘Flood Risk and Coastal Change’ provides additional advice to Planning Authorities and developers on how flood risk planning policy should be implemented. As a ‘live’ resource, is updated as and when necessary. The Sequential Approach in the preparation of a Local Plan 30. PPG advises that the application of the sequential approach in the plan-making process, in particular application of the Sequential Test, will help ensure that development can be safely and sustainably delivered and developers do not waste their time promoting proposals which are inappropriate on flood risk grounds. In the preparation of a Local Plan, the LPA should demonstrate it has considered a range of site allocations, using SFRAs to apply the Sequential and Exception Tests where necessary. 31. Within each flood zone and where appropriate information is available, surface water and other sources of flooding also need to be taken into account in applying the sequential approach to the location of development. 32. In Poole, the area to which the Sequential Test will apply is the whole of the Local Planning Authority area.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 10 3. The Borough of Poole Study Area 33. The Borough of Poole covers an administrative area of just over 6,400 hectares (about 25 square miles), with land stretching from sea level on the coast to a height of approximately 78 metres AOD (Above Ordnance Datum) on Higher Blandford Road adjacent to Corfe Hills School. It enjoys an environment of remarkable richness and diversity. The town is renowned for its location on the northern shores of Poole Harbour. Poole, with a population of 150,5773, lies within the South East Dorset conurbation which has an overall population of about 482,8404. Poole shares a common boundary with Bournemouth to the east, whilst the northern boundary is formed by the River Stour, with Wimborne (East Dorset) beyond. To the west lie Corfe Mullen (East Dorset) and Upton (Purbeck). 34. Poole’s natural environment is one of its most distinctive, valuable and attractive features. The Borough possesses a unique character in which coast, town and countryside all play a part. 35. The natural environment of Poole is characterised by lowland heathland. Canford Heath, Upton Heath and scattered fragments to the north of Poole and within the urban area, have been confirmed as part of the Dorset Heathlands Special Protection Area, Ramsar Sites and Special Areas of Conservation. By the late 1970s, Canford Heath was the largest unbroken area of heathland in Dorset. Most of these heathland areas are Sites of Special Scientific Interest (SSSIs) and have been confirmed as Special Protection Areas (SPAs). They are a significant part of the unique environmental quality recognised as constraining the future outward growth of the conurbation.

3 ONS mid-year population estimate, 2016 4 ONS mid-year population estimate, 2016 Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 11 Figure 1: Poole Study Area

Source: Borough of Poole

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 12 4. Flood Risk 36. The NPPF defines flood risk as “a combination of the probability and the potential consequences of flooding from all sources – including from rivers and the sea, directly from rainfall on the ground surface and rising groundwater, overwhelmed sewers and drainage systems, and from reservoirs, canals and lakes and other artificial sources.”5 Sources of Flood Risk 37. Flooding is a natural hazard that can happen at any time in a wide variety of locations. There are several forms of flooding which present a range of different risks. The speed of inundation and the duration of different forms of flooding vary greatly. With climate change, it is the frequency, pattern and severity of flooding that are forecast to change and become more damaging. 38. The limit of flood risk areas cannot be defined precisely because floods with similar probability can arise from different combinations of weather, sources, rainfall patterns, local topography and patterns of development. 39. Flooding can come from rivers and the sea, directly from rainfall on the ground surface and rising groundwater, as well as sewers and drainage systems that become overwhelmed with water volume. Every flood will have a different impact on people, property and the environment. The consequences of flooding depend greatly on land use. Overtopping of a flood defence in a densely populated urban area could have a serious threat to human life. The same event in a rural area may pose a much lower risk. 40. Flood Risk modelling undertaken by the Borough of Poole has provided evidence of the level of future flood risk at 2133 (100 years beyond the Local Plan period 2013-2033), for a 1 in 200 year tidal still water event (see Figure 14 – Climate Change chapter). Flood Zones 41. Flood Zones refer to the probability of river and sea flooding, ignoring the presence of defences. They are shown on the Environment Agency’s Flood Map for Planning (Rivers and Sea), available on the EA’s web site. Table 1 set out the detail of the Flood Zones mapped by the EA, which are replicated in Figures 2 and 4. Table 1: Flood Zones Flood Zone Definition

Zone 1 Low Land having a less than 1 in 1,000 annual probability of river or sea flooding.

Probability

Zone 2 Medium Land having between a 1 in 100 and 1 in 1,000 annual probability of river flooding; or land Probability having between a 1 in 200 and 1 in 1,000 annual probability of sea flooding. Zone 3a High Land having a 1 in 100 or greater annual probability of river flooding; or Land having a 1 in Probability 200 or greater annual probability of sea flooding. Zone 3b The This zone comprises land where water has to flow or be stored in times of flood. Local Functional planning authorities should identify in their Strategic Flood Risk Assessments areas of Floodplain functional floodplain and its boundaries accordingly, in agreement with the Environment Agency.

Source: Environment Agency.

5 Technical Guidance to the National Planning Policy Framework (March 2012): Para. 2 – page 2. Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 13 Flooding from Main Rivers and Streams 42. Rivers flood when the amount of water in them exceeds the flow capacity of the river channel. Most rivers have a natural floodplain into which the water spills in times of flood. Flooding can either develop gradually or rapidly according to how steeply the ground rises in the catchment and how fast water runs off into watercourses. In large, relatively flat catchments, flood levels will rise slowly and natural flood plains may remain flooded for several days, acting as the natural regulator of the flow. In small, steep catchments, local intense rainfall can result in the rapid onset of deep and fast-flowing flooding with little warning. Such “flash” flooding, which may only last a few hours, can cause considerable damage and possible threat to life. Land use, topography and the form of local development can have a strong influence on the velocity and volume of water and its direction of flow at particular points. 43. The River Stour defines much of the northern boundary of the Borough and flows south of Wimborne from west to east into Bournemouth and beyond. The functional flood plain associated with the Stour floods regularly and it is essential that flood plains are left unobstructed by development in order to allow floodwater to drain away efficiently. 44. The Environment Agency has embarked on a river modelling exercise for the ‘Lower River Stour’ which may change the extent of current flood zones. Whilst no development is proposed within the flood plain, any future development proposed adjacent to it will need to have regard to the outcomes of this work. Once completed, the outputs of this modelling, which will include allowances for climate change, will update the area of functional flood plain associated with the River Stour. When available, this information will be incorporated into Poole’s flood risk model. Until this time, the whole of EA Flood Zone 3b should be assumed to be the functional flood plain unless it can be demonstrated otherwise through a site specific FRA. 45. Figure 2 details areas in the north of Poole at current day risk of fluvial (river) flooding, primarily associated with the River Stour. The data is taken from the Environment Agency Flood Map for Planning6. It should be noted that Figure 4, which provides details of areas of Poole at current day risk of tidal flooding, also includes some elements of fluvial flood risk, primarily in the northern extent of Holes Bay and in the vicinity of the Fleetsbridge Roundabout.

6 http://apps.environment-agency.gov.uk/wiyby/37837.aspx Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 14 Figure 2: Areas at risk of fluvial (river) flooding in the north of Poole - current day

Source: Environment Agency.

46. In the South-West corner of the borough the Rock Lea River discharges into Lychett Bay following the landline curve of Turlin Moor and then out on into the Wareham Channel. 47. A number of small streams in the north of the Borough flow from their source into the Stour, whilst other water sources south of Canford Heath flow in a generally southerly direction to discharge in Poole Harbour or Poole Bay. Many of these watercourses have been piped and would now be classified as surface water sewers. 48. Figure 3 identifies the main rivers and streams in Poole, the data for which is taken from Environment Agency mapping sources.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 15 Figure 3: Main river and streams in Poole

Source: Environment Agency.

49. It should be noted that the Environment Agency mapping does not take into account the presence of flood defences, neither does it include an allowance for climate change, including sea level rise or storm events.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 16 Flooding from the Sea 50. Flooding to low-lying land from the sea and tidal estuaries is caused by storm surges and high tides. Where tidal defences exist, they can be overtopped or breached during a severe storm and this is forecast to become increasing likely with climate change. Coastal flooding has the potential to have the most widespread impact in a single event. The onset of flooding from the sea can be rapid, with little warning (though there is often greater predictability than with fluvial flooding). It is deep, fast-flowing water that can create an extreme hazard. The severity of such flooding will depend on a number of factors, often in combination: the height of tides; weather systems including wind and wave conditions; and the state of flood defences. 51. Areas of Poole at current day risk from tidal flooding are shown in Figure 4. Tidal flood risk in Poole is largely confined to its low lying coastal margins, which are most at risk from high tides and storm surges. Under these conditions, which are expected to become increasingly likely as a consequence of climate change, existing flood defences can be overtopped or breached. Figure 4: Areas at risk of tidal and fluvial flooding in southern Poole - current day

Source: Environment Agency.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 17 Flooding from Land (Surface water flooding) 52. Surface water flooding is usually the result of intense rainfall, often of short duration, that is unable to soak into the ground or enter drainage systems can run quickly off land and result in local flooding. In developed areas, this flood water can be polluted with domestic sewage. Local topography and built form can have a strong influence on the direction and depth of flow. The design of development down to a micro-level can influence or exacerbate this. Overland flow paths should be taken into account in spatial planning for urban developments. Flooding from land can be exacerbated if development increases the percentage of impervious area. Run-off may be polluted with hydrocarbons and other vehicle residues from road surfaces and a potentially wide range of other chemicals from hard surfaces in industrial or agricultural sites. 53. As a requirement of the Flood and Water Management Act, and in its capacity as a LLFA, the Borough of Poole has developed a Local Flood Risk Management Strategy (LFRMS) 2017-2019 (July 2017). The strategy, in line with the responsibilities of Poole as a LLFA, identifies local sources of flooding from surface water, groundwater and ordinary water courses, but recognises that flooding arising from rivers, tides and sewers also need to be considered. The strategy proposes the development of eight Surface Water Management Plans (SWMPs), which take into account flood risk from all sources, which will contain an action plan covering potential flood management schemes that could be implemented. A map defining the SWMPs areas and a table setting out the proposed sequence of their production are included as appendices B and C to the LFRMS7. 54. The Environment Agency’s surface water flood maps give an indication of the broad areas likely to be at risk of surface water flooding and are not suitable for identifying whether an individual property will flood. Figure 5 indicates the chance of surface water flooding occurring in locations across Poole in any given year for a 1 in 30 (3.3%) and 1 in 100 (1%) year event.

Surface water flooding at Whitecliff Road.

7 https://poolebay.net/srm/

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 18

Figure 5: Areas at risk of surface water flooding in Poole.

Source: Environment Agency.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 19 Flooding from Groundwater 55. Groundwater flooding occurs when water levels in the ground rise above surface elevations. It is most likely to occur in low-lying areas underlain by permeable rocks (aquifers). These may be extensive, regional aquifers, such as chalk or sandstone, or may be localised sands or river gravels in valley bottoms underlain by less-permeable rocks. Water levels below the ground rise during wet winter months, and fall again in the summer as water flows out into rivers. In very wet winters, rising water levels may lead to the flooding of normally dry land, as well as reactivating flow in ‘bournes’ – streams that only flow for part of the year. The chalk shows some of the largest seasonal variations in groundwater level, and is the most extensive source of groundwater flooding. Groundwater flooding may take weeks or months to dissipate because it moves much more slowly than surface water and will take time to flow away. 56. The Environment Agency ‘Areas Susceptible to Groundwater Flooding (AStGwF)’ mapping is based on a 1km square grid that identifies areas susceptible to flooding from groundwater on the basis of geological and hydrogeological conditions. It classifies susceptibility or risk, at a broad scale, under four categories, namely negligible; low; medium and high. Figure 6 provides details of the susceptibility of areas within Poole to groundwater flooding. Flooding from Sewers 57. In urban areas, rainwater is frequently drained into surface water sewers, or sewers containing both surface and waste water known as “combined sewers”. In Poole there is a separated system. In practice, the foul sewer does have a storm response due to private mis-connections and localised surface water flooding and infiltration. Flooding can result when the sewer is overwhelmed by heavy rainfall, becomes blocked or is of inadequate capacity, and flooding will continue until the water drains away.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 20 Figure 6: Areas susceptible to groundwater flooding.

Source: Environment Agency.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 21 Historic Flooding in Poole 58. Table 2 documents historical flood events in Poole dating back to the year 2000, and records incidents arising from a variety of sources. Table 2: Historical flood events in Poole. Location Type of Flooding Extent of Flooding Date (last record) Shore Road Tidal flooding Highway 20/12/2013- 05/01/2014 Town Quay Road, Ferry Road, West Quay Road, Tidal flooding Highway, private and 14/12/2012 Blandford Road, Bridge Appraoch and Sydenhams industrial properties Sterte Avenue West, Sterte Avenue, Sterte Road Tidal flooding Highway, private and 14/12/2012 and Sterte Esplanade industrial properties Creekmoor Lane, Hazlebury Road, Upton Road, Tidal flooding Highway, private and 14/12/2012 Marshes End industrial properties Green Gardens, Labrador Drive Tidal flooding Highway, private and 14/12/2012 industrial properties Sanbanks Road, Wedgewood Drive, Shore Road, Tidal flooding Highway, private and 14/12/2012 Banks Road, Seacombe Road industrial properties Russell Gardens Surface water Highway 13/09/2016 Rossmore Road, Enfield Road, Heathfield Road, Surface water Highway, private 12/05/2016 Cecil Road, Jellicoe Road adn Jellicoe Close, Lake property Avenue and Lake Drive, Churchfield Road and Ringwood Road, Uppleby Road, Vicarage Road, Alder Crescent adn Sandbanks Road, Lincoln Road, Arne Avenue and Melbury Avenue, Fitzworth Avenue, School Lane and Evering Avenue The Avenue, Florence Road, Douglas Road, Surface water Highway, private and 03/07/2015 Dolbery Road North, Dale Valley Road, Earlham commercial property Drive and Palmerston Road, Churchfield Road, Sandbanks Road, Mannings Heath Road, Canford Heath Road, Victoria Road, Kings Avenue, Alderney subway, Ringwood Road, Cranbrook Road and Mellstock Road Poole Beach Frontage, Baiter Tidal flooding and Beach erosion, damage 14/02/2014 surface water to seawall Magna Road, Surface Water - Highway 14/02/2014 blockage Dolbery Road South, Surface Water Highway/subway 14/02/2014 Holes Bay cycleway, Tidal flooding and Highway and coastal 14/02/2014 surface water erosion/damage Falconer Drive, Cobbs Quay Tidal flooding and Highway, private 14/02/2014 surface water property and coastal erosion/damage South Haven Close, Fishermans Wharf, Falconer Tidal flooding Highway, private and 14/02/2014 Drive and Stepnell Reach-Balndford Road, commercial property Sydenhams, Outdoor Eduation Centre, K.J.Howells and Sons, Unit M Arthur Bray Yard and Bournemouth Canoes

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 22 Location Type of Flooding Extent of Flooding Date (last record) Knighton Heath Golf Club, Parkstone Golf Club, Surface water Highway, private and 14/02/2014 Broadstone Golf Club and Caesas Bistro, commercial property Greensleaves Avenue, Delph Road and Mansfield Road Shore Road, Seacombe Road Tidal flooding Highway 05/02/2014 Hazlebury Road, Upton Road Tidal flooding Highway 03/02/2014 Seacombe Road Tidal flooding Highway 03/02/2014 Sterte Avenue Tidal flooding Highway 03/02/2014 Bourne Valley, Coy Pond, Sterte Avenue West Capacity, blockage Highway, open space 24/09/2012

Hatch Pond Road Capacity problem Highway, private and 18/08/2011 industrial properties, open space Bourne Valley, Wren Crescent, Alder Road and Blockage Highway, private 18/08/2011 South Park Road properties, heathland, open space Lake Drive, Blandford Road Capacity and tidal Highway, private 18/08/2011 locking properties, open space Mellstock Road Capacity and tidal Highway, private 18/08/2011 locking properties, open space Arrowsmith Road Capacity, blockage Highway, private 18/08/2011 properties, open space County Gates, Poole Road Capacity problem Section of highway 16/11/2010 Fleetsbridge Fleetsbridge roundabout Surface Water Section of highway and 05/10/2010 subway Broadstone, Fairview Road Blockage/capacity Section of highway and 12/07/2010 front gardens Alder Road Capacity/Blockage Section of Highway 24/06/2010 Bearwood, Wood Lane Possible capacity Private gardens 19/11/2009 problem/unknown Parkstone, Walton Road Possible capacity Section of highway and 13/11/2009 problem garden Oakdale, Oakdale Middle School Blockage/obstruction Back gardens of private 12/09/2009 to watercourse properties and public open space Ringwood Road Combination surface Section of highway and 22/07/2009 water, blockage and property capacity Millfield Surface water runoff Housing association 09/02/2009 properties improved by BoP Scheme Turlin Moor, Maryland Road Tidal locking causes Section of highway 15/12/2008 surface water to surcharge sewer Branksome Chine Stream, Pinecliff Road Blockage/obstruction Section of highway flood 10/11/2008 to watercourse and public open space Magna Road Surface water runoff Section of highway 10/11/2008 Lower Parkstone, Bournemouth Road Highway drainage Section of highway 01/06/2008 Turlin Moor, Middlebere Crescent Blockage Section of highway 08/05/2008 Whitecliff, Sandbanks Road Tidal locking causes Section of highway and 10/03/2008 surface water to back gardens of private Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 23 Location Type of Flooding Extent of Flooding Date (last record) surcharge sewer properties Old Town West Quay Road Overtopping of sea Section of highway and 10/03/2008 wall tidal not SW a commercial property Evening Hill, Shore Road Overtopping of sea Section of highway 10/03/2008 wall tidal not SW Sandbanks, Seacombe Road Tidal locking causes Section of highway 10/03/2008 surface water to surcharge sewer Sandbanks, Shore Road Overtopping of sea Section of highway 10/03/2008 wall and tidal locking Creekmoor, Creekmoor Lane. Tidal locking causes Section of highway 10/03/2008 surface water to surcharge sewer Broadstone Lower Blandford Road Surface water Section of highway 22/01/2008 possible capacity Parkstone, Herbert Avenue Blockage/capacity Section of highway and 22/01/2008 front gardens Alderney, Dolbery Road North Possible Section of highway and 17/01/2008 Blockage/capacity subway Parkstone,Ashley Road highway drainage Section of highway 07/01/2008 Oakdale, Darby’s Close Capacity problem Section of highway 22/11/2007 Bourne Valley Road Capacity/Blockage Section of highway 10/02/2005 Hamworthy Blandford Road Tidal locking causes Highway flooding - 08/01/2004 surface water to improved by Wessex surcharge sewer Water scheme Sterte Espanade Tidal locking causes Section of highway flood 26/11/2003 surface water to and public open space surcharge culverts Little Canford Main river – Stour, Land adjacent to river 31/10/2000 Fluvial not SW Knighton Main river – Stour, Land adjacent to river 31/10/2000 Fluvial not SW Source: Borough of Poole.

59. The table of flood events demonstrates that to date, Poole has not been subject to major flooding, that is, that would be categorised as an emergency. Incidents have been relatively rare, of short time frame and have not been a serious threat to human life. 60. Flood records are updated when new flood event data becomes available. Those using the data to inform a Flood Risk Assessment should check with the Borough of Poole to ensure the most up to date information is used.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 24 Coastal Change 61. Flooding and coastal erosion are natural processes that can lead to physical changes in the shoreline through erosion, coastal landslip, permanent inundation (land lost permanently to the sea), or coastal accretion (the process of coastal sediment returning to the visible portion of a beach or foreshore). The risks associated with events of this nature are likely to increase as a result of climate change due to sea level rise and increases in the frequency, intensity and severity of coastal storms and rainfall affecting flooding in fluvial catchments and urban ground and surface water systems. 62. The impacts of climate change are likely to exacerbate the problems that coastal areas already face such as erosion of the shoreline, coastal flooding and water pollution affecting man-made infrastructure and coastal ecosystems. Whilst it is not possible to prevent all flooding or coastal erosion, there are actions that can be taken to manage these risks and reduce the impacts on communities. 63. The NPPF8 states that “local planning authorities should reduce the risk from coastal change by avoiding inappropriate development in vulnerable areas or adding to the impacts of physical changes to the coast”. Poole Harbour and Christchurch Bays (Two Bays) Shoreline Management Plan (SMP2) 64. A high-level assessment of the consequences of climate change on Poole’s coastline is provided by the Poole Harbour and Christchurch Bays (Two Bays) Shoreline Management Plan (SMP2), approved in August 2011, which identifies the risks associated with coastal flooding and erosion to people and the developed, historic and natural environment, and provides a policy framework to address these risks in a sustainable manner over a 100 year timescale. 65. For Poole, the Plan advocates different approaches to shoreline management for the coastline of Poole Bay and that of Poole Harbour. For Poole’s coastline fronting onto Poole Bay, the Plan promotes maintaining protection of the foreshore by recharge and sediment movement control, to sustain recreational and amenity benefits together with the defence of important infrastructure and properties along the crest of the cliff. However, this approach could present difficulties in relation to future funding of this form of coastal protection and the effort required to continue the practice of regular recharge and maintenance of the groynes. There is the possibility that in the later stages of the Plan, an alternative policy to ‘advance the line’ could be adopted, with the aim of constraining sediment drift so as to retain areas of beach between areas of reclamation. 66. However, there is a broader issue for the whole of Poole Bay due to the potential ‘squeeze’ of coastal habitat and the inability of Poole Harbour to respond to sea level rise without the loss of important habitat of nature conservation interest. Within Holes Bay, the area around Upton Country Park has been identified as a location that provides an opportunity for the creation of intertidal habitat. This strategy is consistent with the overall intent to maintain existing defences, whilst encouraging an approach which looks for nature conservation gains. In addition, the Poole and Wareham Flood and Coastal Erosion Risk Management Strategy (March 2015), identifies the consequential impact of coastal squeeze resulting from the ‘hold the line’ policy for the majority of the coastline of Poole Harbour within the administrative boundary of Poole. However, managed realignment schemes such as those proposed at Arne Moors, led by the Environment Agency, and to a lesser extent Turlin Moor, provide opportunities to mitigate the effects of this policy through the creation of compensatory intertidal mudflats, saltmarsh and grazing marsh.

8 National Planning Policy Framework (March 2012) – paragraph 106. Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 25 67. Within Poole Harbour the approach to the management of the shoreline within Poole, will be largely based on a ‘hold the line’ policy, where defences are maintained and upgraded or replaced in their current position, where funding permits. The exception to this approach is in the area of Ham Common and north Holes Bay, where the strategy will be not to invest in the provision or maintenance of defences and to allow the coastline to selectively retreat over the long term.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 26 5. Flood Management and Mitigation Flood Defences 68. Flood defences are structures built to protect an area from flooding, which can take a variety of forms including embankments, walls, weirs, sluices and pumping stations. Of these, some may only be brought into operation when a high tide or flood is forecast or in progress. 69. Raised defences, such as embankments and walls, are a commonly used form of flood defence to mitigate against flood risk. Structures of this nature, however, can be expensive options as they need to be specially designed and engineered to withstand the force of water, and require ongoing maintenance. Raised defences should be designed to achieve at least a 1 in 100 year standard of protection for fluvial flood risk and 1 in 200 year standard of protection for tidal flood risk until the end of the design life, adopting relevant climate change allowances for flood risk assessments. It is also usual to include a ‘freeboard’ allowance to take account of uncertainty, settlement of the structure and wave actions resulting in ‘overtopping’. In Poole the freeboard allowance has normally been set at 600mm. 70. In some instances, more natural methods of dealing with flood water such as wetlands and salt marshes, termed ‘soft defences’, are used to provide space for flood water that helps to prevent flooding elsewhere. These methods can benefit wildlife by providing additional habitat. 71. The following figures detail the nature of existing flood defence provision in relation to the River Stour in north Poole (Figure 7), and at locations around Poole Harbour, including the Town Centre and Holes Bay (Figures 8 to 11). Figure 7: North Poole - existing flood defence structures associated with the River Stour

Source: Environment Agency.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 27 Figure 8: Turlin Moor, Hamworthy - existing harbour edge flood defence and coastal erosion protection structures at Lytchett Bay

Source: Environment Agency. Figure 9: Existing flood defence and coastal erosion protection structures at Hamworthy Park and harbour edge to the west.

Source: Environment Agency.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 28 Figure 10: Central Poole and Parkstone Bay - existing flood defence and coastal erosion protection structures.

Source: Environment Agency.

Poole Quay: Construction works to provide new raised Quay wall.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 29 Figure 11: Poole Harbour - existing flood defence and coastal erosion protection structures - Lilliput to Sandbanks.

Source: Environment Agency. Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 30 Poole Bay, Poole Harbour and Wareham Flood and Coastal Erosion Risk Management – Final Strategy (December 2014) 72. This strategy, developed by the Environment Agency in partnership with other organisations, follows and has reviewed the policies set out in the Poole Harbour and Christchurch Bays (Two Bays) Shoreline Management Plan (SMP2), and which concluded that the developed coastline should continue to be defended. 73. Existing flood defences in Poole are owned and maintained by a range of organisations including the Borough of Poole, Poole Harbour Commissioners, Network Rail, Environment Agency and private property landowners. As a result of the number of owners and overall Strategy frontage length, the flood defence system has a range of standards of protection and condition grades. 74. The strategy broadly summarises the approach to Poole’s flood defences as:-  Sea Frontage - Borough Boundary (with Bournemouth) to Sandbanks: The preferred option is to sustain the current beach and coastal defence structures, with capital investment required to replace existing life-expired groynes, together with periodic beach replenishment at frequent intervals.  Poole Harbour and Central Poole: The preferred option is to reduce tidal flood and erosion risk by implementing improvement schemes to existing defences. As part of a wider strategy, these will integrate with proposed waterside regeneration developments within central Poole, thereby joining the ‘gaps’ between existing defences and providing a notable part of the investment needed. 75. Table 3.2 of the Poole Bay, Poole Harbour and Wareham Flood and Coastal Erosion Risk Management Strategy (Environment Agency: 2014), provides a summary of the nature and condition of existing defences in each of 13 ‘cells’ covering the strategy area (Hengistbury Head to Durlston Head). The entries relevant to Poole are reproduced at Appendix 3. Local Flood Defence Schemes 76. The following tables detail flood defence schemes that have:-  been completed since 2000 (Table 3);  are expected to be completed during 2018/19 (Table 4);  are expected to be delivered during the Local Plan period 2013-2033 (Table 5); and  are scheduled for delivery beyond 2060 (Table 6).

Table 3: Completed local flood defence schemes since 2000. Scheme: Poole Town Quay Sea Defence (Phase 1) Location: Poole Quay (near Poole Pottery) Defence Standard: 1 in 200 years Number of properties defended: 250 Capital cost: £355,000 Contributors: Borough of Poole Completed: April 2001 Description: 300m flood wall in two sections, one of which links into the existing Green Garden scheme. Scheme operates in conjunction with Poole Harbour Commissioners Breakwater scheme.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 31 Scheme: Poole Town Quay Sea Defence (Phase 1 & 2) Location: Poole Quay Defence Standard: 1 in 200 years Number of properties defended: 250 Capital cost: £1,505,000 Contributors: Borough of Poole Completed: April 2004 Description: Phase 2 consisted of a continuation of the new flood wall constructed along the quay between the pumping station and Town bridge.

Scheme: Poole Town Quay West Location: Poole Quay Defence Standard: 1 in 200 years Number of properties defended: 250 Capital cost: £1,505,000 (est.) Contributors: Borough of Poole Completed: April 2004 Description: Phase 2 connects into Phase 1 at the Wessex Water pumping station.

Scheme: Green Gardens Sea Defence Location: Poole (near Quay breakwater) Defence Standard: 1 in 200 years Number of properties defended: 91 Capital cost: £340,000 Contributors: Borough of Poole Completed: 2007 Description: The completed scheme comprises of the upgrading of existing walls, the construction of new walls, the removal of the floodgate and the replacement of the revetment with rock armour.

Scheme: Town Quay - Raising Flood Defences: Phase 1 Location: Fisherman’s Dock Defence Standard: 1 in 200 years Number of properties defended: 265 (Phases 1, 2 & 3) Capital cost: £1,200,000 (Total for phases 1, 2 & 3) Contributors: Government funding/PHC. Completed: July 2015 Description: Raise quayside level along the length of Fisherman’s Dock.

Scheme: Town Quay - Raising Flood Defences: Phase 2 Location: Fisherman’s Dock to Poole Quay Boat Haven. Defence Standard: 1 in 200 years Number of properties defended: 265 (Phases 1, 2 & 3) Capital cost: £1,200,000 (Total for phases 1, 2 & 3) Contributors: Government funding/PHC. Completed: May 2017 Description: Raise quayside level along the length of the given location.

77. Table 4 provides a summary of local flood defence schemes scheduled to be delivered over the next couple of years or so. Whilst funding for the Creekmoor Flood Alleviation scheme has been secured, the other three schemes are dependent on securing the necessary funding for their delivery. All four schemes are designed to provide protection for current and future risks from flooding to at least 2060. Future improvements to the Creekmoor and Sterte schemes that will provide protection beyond this timeframe are identified in Table 6. Table 4: Local flood defence schemes expected to be completed 2018-20 Scheme: Creekmoor Flood Alleviation: Phase 1 Location: Creekmoor Channel discharge point to Poole Defence Standard: 1 in 200 years Harbour. Number of properties defended: 289 Capital cost: £285,500 Contributors: Environment Agency funded Expected completion: 2018 Description: Construct bank and headwall for flap valves at end of Creekmoor Channel.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 32

Scheme: Sterte Flood Alleviation: Phase 1 Location: Sterte Channel discharge point to Poole Harbour. Defence Standard: 1 in 200 years Number of properties defended: 429 Capital cost: £320,000 Contributors: Environment Agency funded Expected completion: 2018 Description: Construct bank and headwall for flap valves at end of Sterte Channel.

Scheme: Hamworthy and Upton Flood Defence Scheme Location: Northern area of Hamworthy, Falconer Drive fronting Defence Standard: 1 in 200 years Holes Bay, Turlin Moor fronting Lychett Bay. Number of properties defended: 130 Capital cost: £162,000 Contributors: Government funding/Developers (CIL/S106) Expected completion: 2018 Description: Construct flood banks.

Scheme: Town Quay - Raising Flood Defences: Phase 3 Location: Poole Quay Boat Haven to near The Quay public Defence Standard: 1 in 200 years house. Number of properties defended: 265 (Phases 1, 2 & 3) Capital cost: £1,200,000 (Total for phases 1, 2 & 3) Contributors: Government funding/PHC. Completed: May 2019 Description: Raise quayside level along the length of the given location.

78. Table 5 provides a summary of local flood defence schemes that are expected to be delivered over the timeframe of the emerging Local Plan i.e. 2013-2033. These defences are anticipated to be delivered as part of development schemes on regeneration sites either side of the Backwater Channel. The construction of these schemes particularly that for sites on West Quay Road, are crucial to protecting the historic centre of Poole. Should these developments not be forthcoming, alternative methods of delivery could be considered (see para’s 166-168 for further details). Table 5: Local flood defence schemes expected to be delivered during the Local Plan period 2013- 2033. Scheme: West Quay Road Flood Defences Location: Harbour edge running parallel with West Quay Road Defence Standard: 1 in 200 years Number of properties defended: 1,463 Capital cost: circa. £10,000,000 Contributors: Government funding/Developers (CIL/S106) Expected completion: 2017 onwards Description: Construct flood defence wall from Poole Town Bridge to RNLI site.

Scheme: Power Station Site Flood Defences Location: West of the Port of Poole, Hamworthy Defence Standard: 1 in 200 years Number of properties defended: 741 Capital cost: circa. £5,000,000 Contributors: Government funding/Developers (CIL/S106) Expected completion: 2017 onwards Description: Construct flood defence wall from Poole Town Bridge to Carter Community School site.

79. Table 6 provides a summary of local flood defence schemes that are expected to be completed beyond the year 2060, as part of an ‘adaptive management’ approach to the delivery of flood defences, where defences are raised, as required, over time. These schemes represent future stages of current flood alleviation schemes programmed for Creekmoor and Sterte (see Table 4).

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 33 Table 6: Local flood defence schemes expected to be delivered beyond 2060. Scheme: Creekmoor Flood Alleviation: Phase 2 Location: Creekmoor Channel and area around Upton Road/ Defence Standard: 1 in 200 years Hazlebury Road. Number of properties defended: 289 Capital cost: Unknown Contributors: tbc Completed: 2060+ Description: Raise existing flood protection structures and consider upstream attenuation and/or pumping station.

Scheme: Sterte Flood Alleviation: Phase 2 Location: Sterte Channel discharge point to Poole Harbour, Defence Standard: 1 in 200 years Stanley Green Road open space and Holes Bay Road revetment Number of properties defended: 429 Capital cost: Unknown Contributors: tbc Completed: 2060+ Description: Raise existing flood protection structures and consider upstream attenuation and/or pumping station.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 34 6. Development Management Site Layout and Design 80. The Sequential Approach should be applied within proposed development sites to locate the most vulnerable elements of the development in the areas at the lowest risk of flooding. Residential developments should therefore be restricted to areas of lowest risk, and parking areas, open space or proposed landscaped areas should be located within the areas of the site where a higher probability of flooding may exist. Raising Ground Levels 81. Raising the ground levels of a site, thereby creating land above the design flood level, can be an effective way of overcoming flood risk, particularly in relation to tidal flooding. This option is most appropriately undertaken as part of the redevelopment of a site, following the demolition of any existing buildings. However, a site-specific FRA will be expected to demonstrate that raising ground levels on a site will not adversely impact surrounding properties and that safe access and egress (including for emergency services), can be achieved from what may in reality be an ‘island ‘site. It should be noted that the raising of ground levels in areas at risk of fluvial flooding is not normally considered acceptable. 82. A potential benefit of this approach in relation to tidal flooding can be that, over time, where adjoining sites are incrementally redeveloped and similarly raise ground levels to mitigate the risk of flooding, a comprehensive flood defence scheme can sometimes be achieved. Safe Access and Egress 83. In order to pass the Exception Test, PPG requires that a FRA should demonstrate that a “development will be safe for its lifetime taking account of the vulnerability of its users, without increasing flood risk overall”. A key aspect of making development safe during a flood event is by ensuring that residents and users have the ability to safely access and exit a building during a design flood and to evacuate before an extreme flood. Even low levels of flooding can pose a risk to people in situ due to the presence of unseen hazards and contaminants in floodwater, or the risk that people remaining may require medical attention. The acceptable level of flood depth for safe access will vary depending on flood velocities and the risk of debris within the flood water. 84. Wherever possible, safe access routes should be set above design flood levels and avoid flood flow paths. Where this is not possible, limited depths of flooding may be acceptable, provided that the proposed access is designed with appropriate signage etc. to make it safe. 85. Where safe access/egress cannot be achieved, a Site Flood Plan should be prepared for users of the development which details how risk will be managed through appropriate evacuation procedures prior to a flood, or by the provision of a temporary safe refuge, depending on the nature of the flood and the timeframe over which people may be trapped. Non-habitable rooms and elements of development proposed below design flood level 86. Non-habitable rooms (i.e. swimming pools; plant room; garages; showers and utility rooms, etc.), proposed at existing floor slab levels and that are ancillary to the main living accommodation, will only be acceptable provided that they cannot be easily converted to habitable living accommodation (i.e. bedrooms, cinema rooms, etc.). The lowering of existing site levels to below design flood level to facilitate the provision of additional uses will not be acceptable. 87. Where basement development is proposed in areas where groundwater flooding is identified as an issue, consideration of this source of flooding should be addressed through the site- specific FRA.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 35 88. Habitable rooms will only be permitted in basements or at levels below recommended finished floor levels provided that they are:- (i) accessed via an internal stairway from a room at or above the recommended finished floor level of the dwelling; and (ii) ‘tanked’ to prevent the entry of ground and/or flood water. Developer Contributions 89. Flood risk management authorities can apply to the Environment Agency for Flood Defence Grand in Aid (FDGiA), to help pay for flood defence schemes that reduce the risk of flooding and coastal erosion for existing communities. Eligibility is dependent on criteria including the benefits the scheme will provide. Some schemes may only be part funded and any shortfall in funding will need to be found from other sources including local levy funding or contributions from other parties that benefit from the scheme. 90. Community Infrastructure Levy (CIL), is a locally set planning charge as a means for local authorities to help deliver infrastructure to support the development of their area. 91. Payments secured through CIL can be used to fund a variety of infrastructure requirements, including flood defences. Further information on CIL, and the requirements of developer contributions can be found on Poole’s website at:- http://www.poole.gov.uk/planning-and- buildings/planning/planning-policy/community-infrastructure-levy/ Residual Flood Risk 92. Technical Guidance9 to the NPPF defines residual risks as “those that remain after applying the sequential approach and taking mitigating actions. It is the responsibility of those planning development to fully assess flood risk, propose measures to mitigate it and demonstrate that any residual risks can be safely managed.” Flood Resilience and Resistance 93. A sequential approach should be applied to the layout and design of developments. More vulnerable uses should be directed to parts of the site at less probability and residual risk of flooding. Lower floors of buildings in areas at medium and high probability of flooding should be reserved for water compatible uses. Those proposing development should seek opportunities to use multi-purpose open space for amenity, wildlife habitat and flood storage uses. Flood risk should be lowered by reducing the built footprint of previously developed sites and using SuDS (where appropriate). Where there is a low probability of limited, shallow depth water entry, but not severe inundation to buildings, the use of flood-resilient construction may be considered. 94. Flood-resilient buildings are designed to reduce the consequences of flooding and facilitate recovery from the effects of flooding sooner than conventional buildings. This may be achieved through the use of water-resistant materials for floors, walls and fixtures and the sitting of electrical cables and appliances at a higher level. If the lowest floor level is raised above the predicted flood level, consideration must be given to providing access for those with restricted mobility. In considering appropriate resilience measures, it will be necessary to take account of specific circumstances and have a clear understanding of the mechanisms that lead to flooding and the nature of the flood risk by undertaking a Flood Risk Assessment. 95. Flood-resistant construction can prevent entry of water or minimize the amount of water that may enter a building where there is flooding outside. This form of construction should be used with caution as effective flood exclusion may depend on occupiers ensuring some

9 https://www.planning.org.au/documents/item/3890 Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 36 elements, such as barriers to doorways, are put in place and maintained in a good state. Buildings may also be damaged by water pressure or debris being transported by flood water. This may breach flood-excluding elements of the building and permit rapid inundation. Temporary and de-mountable defences are not normally appropriate for new developments. 96. The Poole Core Strategy identifies areas within central Poole for growth and regeneration which will require future flood defences for new development. It has been agreed with the EA that sites located within the study area (see Figures 17 & 18) will not need to meet the NPPF Sequential Test requirements. Therefore, where raised defences are present, or will form an integral component of redevelopment schemes in the Regeneration Area, raised access will not be required. In this instance, residual flood risk can be mitigated using the following options, or combination of options:-  Raising finished floor levels;  Building in resistance measures (barriers/stop boards etc) and ensuring structural soundness against flood loadings to new buildings;  Building in resilience measures i.e. raise electrics, use water resilient plaster and flooring etc.;  Introduce lower risk uses to ground floors i.e. offices, shops, undercroft parking etc.; and  Flood warning/evacuation plans. Finished Floor Levels 97. Raising habitable floor levels above the flood level is a common method of mitigating flood risk to people and property, particularly where ‘more vulnerable’ land uses (see Appendix 1) are proposed. 98. As a minimum, finished floor levels should be raised above the extreme flood level. The Environment Agency also recommends a 600mm freeboard allowance (the difference between finished floor levels of habitable rooms and the design flood level) to be achieved, to allow for a margin of safety given that there are always uncertainties associated with predicting current and future flood levels. For the inner Poole Harbour area, such an allowance takes account of any localised wave action and/or wind generated ‘chop’. Emergency Planning 99. The combination of high tides and adverse weather conditions can cause storm surge and overtopping of defences. In severe events this can result in the breaching of sea defences and inundation of the surrounding area inland. Risk to life can be high, with the potential for people being caught in fast flowing waters and currents adding to the usual risks associated with flooding 100. The Civil Contingencies Act 2004 places a statutory duty on Local Authorities, as Category One Responders, to put in place plans that will be used to respond to any significant incident that affects their area of responsibility, which in the context of this document relates to flood events. 101. The Dorset Local Resilience Forum (LRF), is a multi-agency partnership comprising blue- light emergency services, local authorities (including the Borough of Poole), the NHS, the Environment Agency and other partners, which was established in response to the statutory requirements of the Act. The LRF provides a coordinated response to emergency incidents by working together to bring about a safe conclusion. In addition, the Bournemouth and Poole Resilience Group (BPRG), was formed (within the framework of the Dorset LRF), as a

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 37 ‘specialist’ group to focus attention on the risks associated with the Bournemouth and Poole conurbation. 102. The BPRG are responsible for emergency evacuation procedures in the event of a major flooding incident. Whilst the incidence of such an event is relatively uncommon, because they tend to be associated with a combination of high tides and stormy weather conditions resulting in overtopping of flood defences, the impact can be significant due to the amount of housing in areas at risk of flooding. 103. In the event of a major flood, the practicality of safe evacuation from an area will depend on:-  the type of flood risk present, and the extent to which advance warning can be given in a flood event;  the number of people that would require evacuation from the area potentially at risk;  the adequacy of both evacuation routes and identified places that people could be evacuated to; and  sufficiently detailed and up to date evacuation plans being in place for the locality that address these and related issues. Site Level Emergency Planning Considerations 104. Emergency planning and evacuation arrangements are important considerations in ensuring that any new development is safe, including where there are residual risks of flooding. These matters should therefore be addressed in site specific FRA's. 105. The Council recommends that detailed flood warning and evacuation plans are implemented for development located in flood risk areas. Flood warning and evacuation plans will need to take account of the likely impacts of climate change and future occupiers should sign up to the EAs early warning system. In some instances the Council may secure this requirement through condition where it is necessary to ensure development is safe. Plans should include consideration of the availability of flood warnings, safe refuge within the development site and the location of strategic evacuation/rest centres. It should be noted that Planning Practice Guidance advises safe access and egress should be maintained for the lifetime of development. It is important that emergency planning considerations are considered at an early stage as requirements can significantly influence scheme design. Flood Warning Areas 106. The Environment Agency (EA) provides a free Flood Warning Service for many areas at risk of flooding from rivers and the sea, and in some areas when flooding from groundwater is possible. Individuals and businesses can sign up to be advised of flood warnings by telephone, email or text message. 107. The areas within Poole subject to Flood Warnings have been obtained from data available from the EA, which identifies two specific locations. Figure 12 shows the Flood Warning area covering part of Poole Town Centre, The Port, Hamworthy Park and extending across to Ham Common, which is subject to coastal flood risk.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 38 Figure 12: Flood Warning Area – Central Poole

Source: Environment Agency.

108. Figure 13 shows the Flood Warning area associated with the River Stour and its functional flood plain, located to the north of the Borough. This area affects only a limited number of properties. Figure 13: Flood Warning Area – River Stour

Source: Environment Agency.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 39 Flood Risk Assessments 109. A flood risk assessment (FRA) is an assessment of the risk of flooding from all flooding sources, the identification of flood mitigation measures and should provide advice on actions to be taken before and during a flood. It is the responsibility of the applicant/developer to undertake a site specific FRA, to fully assess the flood risk to and from the site, propose appropriate measures to mitigate the risk and demonstrate that any residual risks can be managed safely. 110. FRA’s are required for most developments within one of the flood zones. This includes developments:-  in flood zone 2 or 3 including minor development and change of use;  more than 1 hectare in flood zone 1;  less than 1 hectare in flood zone 1, including a change of use in development type to a more vulnerable class (e.g. from commercial to residential), where they could be affected by sources of flooding other than rivers and the sea (e.g., surface water drains etc); and  in an area within flood zone 1 which has critical drainage problems as notified by the Environment Agency (not applicable to Poole). 111. A development proposal, if having passed the Sequential and Exception Tests, must demonstrate through a site-specific flood risk assessment that “the development will be safe for its lifetime taking account of the vulnerability of its users (see Appendix 1), without increasing flood risk overall”.10 112. Further guidance on the requirements for Flood Risk Assessments is provided by PPG11, which also provides a helpful checklist12 detailing the information that should be contained in a FRA. It should be noted that an FRA should also be appropriate to the scale, nature and location of the development. 113. The objectives of a site-specific flood risk assessment are to establish:  whether a proposed development is likely to be affected by current or future flooding from any source;  whether it will increase flood risk elsewhere;  whether the measures proposed to deal with these effects and risks are appropriate;  the evidence for the local planning authority to apply (if necessary) the Sequential Test; and  whether the development will be safe and pass the Exception Test, if applicable. FRAs for proposed development within Poole should be prepared following the approach recommended by the NPPF and supporting PPG, as well as guidance provided by the Environment Agency. Sustainable Urban Drainage Systems (SuDS) 114. SuDS are drainage systems designed to reduce the risk of flooding from surface water run- off resulting from heavy or sustained rainfall and are designed to mimic natural drainage and

10 NPPF: Paragraph 102. 11 https://www.gov.uk/guidance/flood-risk-assessment-for-planning-applications 12 https://www.gov.uk/guidance/flood-risk-and-coastal-change#Site-Specific-Flood-Risk-Assessment-checklist-section

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 40 typically manage rainfall close to where it falls. They provide an alternative to conventional piped drainage systems used for managing surface water run-off. In an urban area like Poole the majority of SuDS, particularly on smaller developments, take the form of soakaways or permeable paving. On larger development sites they may be incorporated as reed beds, swales, filter strips and ponds. 115. Ground conditions in Poole generally suit sustainable drainage techniques as the predominant soil type is based on sand. However, there are areas of the Borough that are considered unsuitable for SuDS. These include localities near to cliff edges (within 400 metres) at Canford Cliffs and areas of highly impermeable clay soil. Figure 15 defines, in broad terms, where SuDS are considered viable, or potentially viable, together with those areas where SuDS are unsuitable as a method of dealing with surface water run-off. 116. Soil permeability can have a significant effect on the selection of a given SuDS technique. Developers should establish the soil conditions and hydrology of their site at an early stage in the planning process and submit these findings with the planning application to support the schemes drainage system proposals. SuDS should be designed to be proportionate to the level of flood risk affecting the site 117. In March 2015, Defra published non-statutory technical standards for sustainable drainage systems, which set out standards for the design, maintenance and operation of SuDS. The standards apply to systems that drain surface water from housing, non-residential or mixed use schemes, for the lifetime of the developments. The standards should be read in conjunction with the NPPF and PPG advice on SuDS. 118. Local authorities are responsible for the approval of SuDS and of making the final decision about the suitability of their provision on new developments. When considering planning applications local planning authorities are expected to:-  consider SuDs in connection with the planning application;  consult the LLFA (Borough of Poole) on the management of surface water; and  satisfy themselves that the proposed minimum standards of operation are appropriate. 119. Major development (i.e. developments of 10 dwellings or more; or equivalent non-residential or mixed development) are expected to ensure that SuDs for the management of surface water run-off are put in place, unless demonstrated to be inappropriate. 120. The Borough of Poole has adopted Supplementary Planning Guidance (SPG), entitled ‘Sustainable Drainage Systems (SuDS) – Guidance for Developers’. Published in 2002, it is now out of date and a new Supplementary Planning Document (SPD) providing up-to-date guidance on the requirements for SuDS, to be jointly prepared with Bournemouth Borough Council, is planned for the near future. 121. The Council is also producing a series of Surface Water Management Plans (SWMPs) to address flooding from all sources and provide additional detail to the Environment Agency’s surface water mapping (see Figure 5). Flood Risk Assessment’s will need to reference the appropriate SWMP and identify adaptation and mitigation measures, including SuDS, to ensure that flood risk is not increased elsewhere and, where achievable, will reduce flood risk overall.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 41 Figure 14: Poole - SuDs viability map

Source: Borough of Poole.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 42 7. Climate Change 122. In addition to the risk of flooding to existing properties in Poole, there needs to be a consideration of flood risk to new development both now and in the future. The Poole Local Plan will cover the period to 2033, and it is necessary that the Local Plan ensures that sites proposed through allocation and windfall permissions, that deliver future development needs, will not be at excessive risk from flooding during its lifetime, which for residential development is assumed to be 100 years. Once adopted, the revised Local Plan will therefore need to consider and allow for the effects of climate change up to the year 2133. 123. Planning Policy Guidance sets out allowances, by epoch, that should be used as the basis for calculating sea level rise for regions of the UK. The allowances for the South West are set out in Table 7. Table 7: Sea level allowance for the South West for each epoch in millimetres (mm) per year with cumulative sea level rise for each epoch in brackets 1990 to 2025 2026 to 2055 2056 to 2085 2086 to 2115 Cumulative rise 1990 to 2115 / metres (m)

3.5 8 11.5 14.5 1.14 m (122.5 mm) (240 mm) (345 mm) (435 mm)

Source: https://www.gov.uk/guidance/flood-risk-assessments-climate-change-allowances

124. The projections only extend to the year 2115, so for the purpose of calculating sea level rise to 2133, the yearly sea level allowance of 14.5mm for the period 2086 to 2115 will be projected forward. 125. Latest advice in respect of still water tide levels for Poole Harbour has been provided by the Environment Agency and is set out in Table 8. Table 8: Still water tide levels – Poole Harbour (Base Year 2008) Site Year Tidal still water level (metres AOD) for range of return periods. Includes sea level rise allowance (from 2008 to 2016) 1 2 5 10 20 50 75 100 150 200 500 1000 2008 1.44 1.51 1.60 1.68 1.72 1.80 1.84 1.86 1.89 1.92 1.99 2.04 2009 1.44 1.51 1.60 1.68 1.72 1.80 1.84 1.86 1.89 1.92 1.99 2.04 2010 1.45 1.52 1.61 1.69 1.73 1.81 1.85 1.87 1.90 1.93 2.00 2.05 2011 1.45 1.52 1.61 1.69 1.73 1.81 1.85 1.87 1.90 1.93 2.00 2.05 Poole 2012 1.45 1.52 1.61 1.69 1.73 1.81 1.85 1.87 1.90 1.93 2.00 2.05 Harbour 2013 1.46 1.53 1.62 1.70 1.74 1.82 1.86 1.88 1.91 1.94 2.01 2.06 2014 1.46 1.53 1.62 1.70 1.74 1.82 1.86 1.88 1.91 1.94 2.01 2.06 2015 1.46 1.53 1.62 1.70 1.74 1.82 1.86 1.88 1.91 1.94 2.01 2.06 2016 1.47 1.54 1.63 1.71 1.75 1.83 1.87 1.89 1.92 1.95 2.02 2.07 2017 1.47 1.54 1.63 1.71 1.75 1.83 1.87 1.89 1.92 1.95 2.02 2.07 2018 1.48 1.55 1.64 1.72 1.76 1.84 1.88 1.90 1.93 1.96 2.03 2.08 Source: Environment Agency (2017).

126. The most recent ‘base year’ data for a 1 in 200 year still water level was derived in 2008, which for Poole Harbour is 1.92 metres (AOD) – see table 8. This is slightly lower than the previously used 1 in 200 year still water level derived in 2002, which formed the basis of the 2010 data set out in Table 4.4 (page 24) of the Borough of Poole Flood Risk Management Strategy (January 2011). Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 43 127. The 2010 figure of 1.93 metres AOD (1 in 200 year tidal still water level), which includes climate change allowances from the ‘base year’ of 2008, has been used as the starting point for the analysis on which the SFRA has been based. 128. Therefore, a 1 in 200 year tidal still water level of 3.26 metres AOD for the year 2133 is calculated based on current Government Climate Change (sea level rise) allowances (see Table 7) and assuming 14.5mm per year beyond the year 2115. 129. The 2133, 1 in 200 year tidal still water level of 3.26 metres AOD has been used in flood risk modelling, undertaken by the Borough of Poole, to provide evidence of the level of future flood risk. The results of this modelling are shown on the map at Figure 15 (An larger version at A3 is included at Appendix 4). Figure 15: Areas in Poole at future risk of tidal flooding by 2133

Source: Borough of Poole – 2017.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 44 8. Flood risk assessment of potential development sites in Poole Context Poole Core Strategy (Adopted February 2009) 130. The Core Strategy was the first of a series of documents produced as part of Poole’s Local Development Framework (LDF), the spatial planning strategy introduced by the Planning and Compulsory Purchase Act 2004. The LDF for Poole was completed with the adoption of the Site Specific and Development Management Policies and Delivering Poole’s Infrastructure DPD’s, in April 2012. 131. The Core Strategy set out the vision, broad principles and spatial approach to how Poole would change over the period 2006-2026. Due to the presence of significant regeneration opportunities on vacant and derelict brownfield sites in the centre of the town, Poole was conferred with ‘Growth Point’ status, a government initiative which supported local authorities’ ambitions for longer-term sustainable growth. As a consequence, Poole set a target of delivering 10,000 new homes over the plan period, together with supporting economic growth to deliver 13,700 jobs. 132. Constrained by Green Belt and internationally designated heathland to the north and by Poole Harbour and the coast to the south, the Core Strategy identified the urban area, and most significantly the central area of Poole, as the main location for growth, in line with the government policy of re-using brownfield land before considering alternatives. As a main focus for change, the town centre and adjacent regeneration area sites were expected to contribute over 40% of the 10,000 new homes needed over the plan period. However, as much of the central area of Poole is at significant risk from coastal flooding, the Council undertook a sequential assessment to consider if there were alternative locations for development to those proposed. The conclusion was that it would not be possible to find alternative sites of sufficient scale or suitability to accommodate the level of development needed. The Council carried out an exception test which demonstrated that the town centre offered the most sustainable location for housing growth, on condition that appropriate flood adaptation and mitigation measures were put in place in accordance with the SFRA. 133. An additional factor supporting this approach was that the presence of large waterfront sites provided a unique opportunity to deliver comprehensive flood defence schemes to not only serve the development but, in addition, existing properties at risk of flooding in the wider town centre area. Poole Local Plan 134. As part of the evidence base supporting the development of housing policy for the review of the Poole Local Plan, a Strategic Housing Market Assessment (SHMA) was jointly prepared on behalf of the local authorities comprising the Strategic Housing Market Area of South East Dorset. The SHMA set out the Objectively Assessed Need (OAN) for each of the constituent authorities, with Poole’s being identified as 710 new homes per annum, equating to 14,200 in total over the plan period 2013-2033, a significant increase over the 500 homes per annum required by the current Core Strategy. These are in addition to the 3,045 homes delivered under the existing Core Strategy up to the year 2012-13. 135. In order to determine if this level of housing could be accommodated within Poole, a comprehensive and detailed capacity study was undertaken. In line with the NPPF, which encourages the effective use of previously developed ‘brownfield’ land, the study looked at all potential sources of supply, using as its basis the types of sites and sources of data recommended by Planning Practice Guidance. The findings of the study are set out in the Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 45 Housing and Economic Land Availability Assessment (July 2017)13, a background paper to the Local Plan. 136. In summary, the capacity study assessed a range of sites broadly falling within the following categories:-  currently allocated sites that had yet to be delivered;  new urban brownfield sites that could be considered for allocation, some of which were in the Council’s ownership, or had been identified by ourselves, and some of which had been promoted by landowners; and  outward expansion sites i.e. sites within the Green Belt. 137. Figure 16 shows the distribution of sites assessed across the Borough, including a number of potential sites within Poole’s Green Belt that were considered as part of an ‘outward expansion’ option to meet housing needs, as part of a public consultation in 2016. 138. In addition to identifying appropriate sites for development, the strategic approach also recognised that sustainable development could be delivered by increasing the density of development through:-  the consideration of tall buildings in appropriate locations within the Town Centre; and  a more flexible policy on flatted development in proximity to public transport corridors. 139. The study informed the development of five strategic options to meet Poole’s development needs which were the subject of public consultation in February 2105. Based on the outcomes of this consultation, three options were shortlisted, these being:-  Option A - increase densities within the built-up (urban) area;  Option B - expand the town outwards; and  Option C - a balanced approach combining options A and B. 140. These options and a range of sites considered through the assessment process, were the subject of public consultation between Monday 13 June 2016 until Monday 8 August 2016. In total, the consultation documents sought views on the potential allocation of:-  13 existing sites allocated for development in current development plan documents;  31 possible new sites in the urban area; and  9 sites that would expand the town outwards. 141. The site assessment process was informed by a comprehensive review of flood risk in relation to each site. The sources of flood risk considered were:-  Tidal flooding:- o Whether within EA Flood Zones 1, 2 and/or 3 (and where partially within these zones, the percentage of the site in each); and o 2133 Future Flood Risk Zone – based on modelling undertaken by the Borough of Poole;  Fluvial flood risk – primarily in relation to the River Stour – based on the EA’s Flood Zone mapping for planning;  Surface water flooding – based on the EA’s surface water flood maps;

13 http://www.poole.gov.uk/EasySiteWeb/GatewayLink.aspx?alId=37474

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 46  Flood risk from groundwater sources – based on the EA’s ‘areas susceptible to groundwater flooding’ maps; and  SuDS viability.

Figure 16: Poole – Distribution of potential development sites – Consultation 2016

Source: Borough of Poole

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 47 142. The assessment of flood risk for each site with development potential, considered as part of the review process, is set out at Appendix 2. 143. Analysis of the assessment clearly demonstrates the current and future vulnerability of key development sites in Poole Town Centre and the adjacent Twin Sails regeneration area, to tidal flood risk. 144. The majority of sites outside of Poole Town Centre and the adjacent Twin Sails regeneration area are not at risk of tidal flooding, either currently or as a result of the predicted rise in sea level to 2133. 145. It should be noted that the strategic options and potential sites for allocation were subject to Sustainability Appraisal (SA), informed by the flood risk assessment process. One of the six high level objectives in the SA process is ‘maintain and improve environmental quality and assets’, of which a sub-objective is ‘reduce vulnerability to flooding and sea level rise’. Summary 146. This revised Level 1 SFRA for Poole, has established that the development needs of Poole over the period 2013-2033, cannot be wholly accommodated in areas of low flood risk. 147. Chapter 8 of the revised Level 1 SFRA has set out in detail the strategic options explored and the range of sites assessed and consulted on to meet Poole’s future development needs, particularly in relation to housing and employment. 148. Whilst the application of a sequential approach to the location of development would normally be adopted in allocating sites for development, the number of new homes required over the plan period and the relatively limited supply of sites, together with the availability of sites in a highly sustainable location, makes the town centre and Twin Sails regeneration area, preferred locations for development. 149. In common with the adopted Core Strategy, the emerging Local Plan relies on a significant proportion of its forecast housing needs to be delivered on sites in and around the Town Centre and the Twin Sails regeneration area, much of which lies within areas of current and future flood risk. The emerging Local Plan seeks to ‘roll forward’ existing allocations in these areas, but in addition identifies new sites that will be required to deliver forecast housing and employment targets. This is particularly the case for housing, classified as a ‘more vulnerable’ form of development to flooding (see Appendix 1).

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 48

Part 2: Level 2 Strategic Flood Risk Assessment

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 49 9. The need for a Level 2 Strategic Flood Risk Assessment

150. PPG in relation to strategic flood risk assessment expects that a Level 2 assessment should build on the Level 1 assessment and include enough information for the exception test to be applied. Where a level 2 SFRA is produced, the sequential approach and the sequential test should be applied to identify sites with the lowest risk of flooding within flood zones 2 and 3. Background 151. The 2009 Level 1 SFRA established that development needs promoted through the Core Strategy, particularly housing, could not be wholly accommodated in areas of low flood risk. As a consequence, a Level 2 SFRA was undertaken by the Council which facilitated a detailed application of the Sequential Test and Exception Test on Poole Town Centre and the adjacent Twin Sails regeneration area, where strategic sites needed to deliver significant elements of Poole’s future growth were located in existing and future areas at risk of flooding. 152. The Level 2 SFRA was informed by a report which provided detailed analysis and mapping of flood hazard14 due to tidal flooding for the regeneration areas within Poole, for both current day and climate change scenarios. The report defined a study area covering the town centre and regeneration area sites to which the Sequential Test and Exception Test were applied. 153. The Level 2 SFRA was supplemented by a Flood Risk Management Strategy (January 2011), the purpose of which was to provide a strategic review of flood risk to 100 years beyond the end of the Core Strategy (i.e. 2126). It further established a robust and defendable long term framework to inform decisions on flood risk and the provision of future improved flood defences, compliant with the shoreline management policies set by the Poole and Christchurch Bays Shoreline Management Plan (SMP2). 154. The FRMS recognised that Poole Town Centre and the adjacent Twin Sails regeneration area were important elements in the delivery of the Core Strategy. However, it acknowledged that whilst existing flood defences provide some flood risk benefits, they did not provide the protection required to enable development with a life expectancy of 100 years. Application of the Sequential Test - Central Poole Area 155. As previously stated, it has been established that development needs, defined by the evidence base supporting the review of the Poole Local Plan, particularly housing, cannot be wholly accommodated in areas of low flood risk and it is therefore acknowledged that development will be required on sites in current and future areas at high risk of flooding. These sites lie within the study area established by previous modelling work covering the town centre and Twin Sails regeneration area. On the advice of the Environment Agency, the boundary of the study area was reviewed and subsequently adjusted to refine the area covered. Figure 17 provides details of the adjustments made to the study area boundary.

14 Flood modelling to support Poole SFRA Level 2: H R Wallingford (January 2008). Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 50 Figure 17: Central Poole Area – revised boundary for area of Sequential Test and Exception Test application

Source: Borough of Poole Analysis of housing capacity in Poole 156. Section 8 of the Level 1 SFRA sets out the methodology adopted in determining housing capacity across the Borough to meet the forecast requirement, identified through the South East Dorset SHMA (October 2015), of 14,200 new homes over the period 2013-2033 (710 per annum). An assessment was also undertaken of a range of sites, the outcome of which has contributed towards the identification of sites to meet forecast development needs. 157. The Housing and Economic Land Availability Assessment (July 2017), a background evidence base report supporting the review of the Local Plan, draws together the evidence of the assessments of both housing and employment land supply, and demonstrates how forecast requirements will be met. From the perspective of meeting the housing requirement identified in the SHMA, ‘Table 1: Summary of all sources of housing supply’, of the report, reproduced at Table 9, sets out how this will be achieved.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 51 Table 9: Summary of all sources of housing supply

Category Dwellings (Net) A. Completions (1 April 2013 – 31 March 201815) 2,030 B. Under construction - as at 31 March 2017 827 C. Planning permissions not started - as at 31 March 2017 889 D. Proposed Local Plan urban allocations 6,465 E. Urban area identified sites 1,447 Comprises: i. Public sector-owned land (including Borough of Poole-owned land): 225 ii. Strategic Housing Land Availability Assessment sites: 1,355 iii. National Land Use Database sites (>0.25ha): 53 iv. Refused/withdrawn planning applications 2006-2016 – with capacity: 167 v. Dismissed appeals 2006-2016 – with capacity: 115 vi. Redevelopment of land/premises administered by Poole Housing Partnership: 150 vii. Sites granted planning permission during 2016-17 subject to signing of Section 106 Agreements: 32 viii. Planning applications registered during 2016-17 with no final decision as of 31 March 2017: 77 Sub-total: 1,650; Total with 30% discount: 1,447 F. Windfall 2,100 (Assumes 150 annual average for 14 years from 2019/20 - 2032/33) Subtotal – Capacity from urban area 13,758 G. Proposed Local Plan urban extension allocations Land north of Bearwood 800 Land north of Merley 500 Subtotal – Capacity from proposed urban extension allocations 1,300

TOTAL 15,058 Source: Borough of Poole Housing and Economic Land Availability Assessment (November 2017).

158. Figure 18 details the location of sites that lie within the Central Poole Area Sequential/Exception Test study area that have been assessed for their development potential to meet identified needs for housing and employment. All of these sites are affected either wholly, or in part, by existing or future flood risk.

15 Includes assumption of 650 completions for 2017/18 Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 52

Figure 18: Sites within the Sequential/Exception Test application study area that have been assessed for their potential to deliver housing and employment.

Source: Borough of Poole

159. Table 10 details those sites that lie within the Poole Central Area Sequential Test and Exception Test study area, which have been assessed for their potential to deliver housing needs to meet the SHMA forecast requirement.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 53 Table 10: Sites within the Central Poole Area assessed for their potential to deliver housing Site Name Existing Site Ref. Net Capacity Allocation North of Twin Sails Bridge  PCS11a 550 Between the Bridges  PCS11b 450 Pilkington Tiles  PCS11c 160 Sydenhams  PCS11c 300 Former Power Station  PCS11d 900 Goods Yard  SSA12 300 Quay Thistle  SSA14 180 Dolphin Centre, Dolphin Pool and Seldown (part) A1/A2 500 Former Natwest - A3 150 Stadium - A4 430 St Johns House - A4 200 6-12 Wimborne Road - A5 50 Hunger Hill junction - A8 80 Lagland Street & Hill Street (part) SSA11/A9 60 13-15 High Street - A15 20 Corfe House - A16 30 Patrick House - A17 40 Westover House - A18 80 Poole Pottery A23a 50 Skinner Street and surrounds - - 100 Source: Borough of Poole

160. Of the sites assessed for their potential to deliver housing in the Poole Central Area, Table 11 details those sites that will be taken forward as potential allocations in the Draft Local Plan, the majority of which are sites previously allocated for development. These sites, including those newly proposed for allocation, are all either wholly, or partially, within areas of existing or future flood risk. They have the potential to deliver 4,380 of the required 14,200 new homes, which represents approximately 31% of the housing needed over the period 2013-2033.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 54 Table 11: Sites within the Poole Central Area assessed for their potential to deliver housing Site Name Existing Draft Net Capacity Allocation Local Plan Allocation Ref Dolphin Centre, Dolphin Pool and Seldown (part) T1 500 Stadium - T2 430 Goods Yard  T3 300 St Johns House - T4 200 Former Natwest - T5 150 6-12 Wimborne Road - T6 50 Former Power Station  T7 900 North of Twin Sails Bridge  T8 550 Between the Bridges  T9 450 Sydenhams  T10 300 Pilkington Tiles  T11 160 Quay Thistle  T12 180 Skinner Street and surrounds - T13 100 Lagland Street & Hill Street (part) T14 60 Poole Pottery - T15 50 Total 4,380 Source: Borough of Poole

161. The evidence provided by the capacity study and the assessment of a range of sites with the potential to deliver housing, demonstrates that the OAN for housing, established through the South East Dorset SHMA, cannot be met on sites at low risk of flooding. It is therefore considered that on this basis sites located within Poole Town Centre and the Twin Sails regeneration area have passed the Sequential Test as prescribed by the NPPF and PPG.

Application of the Exception Test 162. PPG defines the Exception Test as:- “a method to demonstrate and help ensure that flood risk to people and property will be managed satisfactorily, while allowing necessary development to go ahead in situations where suitable sites at lower risk of flooding are not available. 163. Having demonstrated that Poole cannot deliver its OAN for housing in areas not liable to flood, set by the South East Dorset SHMA, the Exception Test is now applied in relation to the Sequential Test and Exception Test study area covering Poole Town Centre and the Twin Sails regeneration area. 164. There are two parts to the Exception Test. For development to be allocated or permitted, both components have to be passed, they are:-  it must be demonstrated that the development provides wider sustainability benefits to the community that outweigh flood risk; and  a site-specific FRA 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.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 55 Sustainability benefits of development within the Poole Town Centre and Twin Sails regeneration area Sequential Test application area 165. There are a number of key sustainability benefits that development on proposed allocation sites in Poole Town Centre and the Twin Sails regeneration area will deliver. These include:-  maximising the re-use and redevelopment of a number of vacant and underused brownfield sites across the Sequential Test study area, compliant with the NPPF core planning principle which encourages “the effective use of land by reusing land that has been previously developed”16. A specific example of this is the vacant former Hamworthy Power Station site which was awarded Government Housing Zone status in 2015, in recognition of its importance as a strategic housing site. With an area of over 15 hectares, the development of the site provides:- o a significant opportunity to deliver a new community comprising a minimum of 900 new homes, together with supporting office; commercial and community uses and public open space; o the creation of strong links to, and the enhancement of adjacent public open space and provision of safe pedestrian and cycle links that will form part of a wider recreational route around Poole Harbour; and o facilitate the implementation of part of the Port Link Road, designed to improve access to the Port of Poole, a Dorset Local Enterprise Partnership (LEP) priority.  the Town Centre and Twin Sails regeneration area represents a highly sustainable location for development, due to its accessibility and proximity to:- o key public transport facilities (i.e. Poole railway station and Poole bus station), which reduces the need for reliance on the private car; o the Dolphin Shopping Centre and High Street, which constitutes Poole’s Town Centre for shopping; o a range of employment opportunities provided by businesses in and around the Town Centre;  a reduction in the need to consider options for housing in the Green Belt;  development of sites on West Quay Road would deliver strategic flood defences that would ‘plug’ existing gaps. These defences would not only protect the sites themselves, but would provide significant wider benefits by providing protection to Poole’s vulnerable historic core and the wider Town Centre. Demonstrating that development is safe for its lifetime 166. The second part of the Exception Test requires that a site-specific FRA should be provided that demonstrates that development is safe for its lifetime. General requirements for a site- specific FRA are set out in section 6 of Part 1 of this document. Further detailed guidance and a helpful checklist detailing the information that an FRA should contain are provided by PPG. Flood Defences 167. The revised Level 1 SFRA at Section 5, describes the provision of existing flood defences and where recent flood defence works have been completed or are proposed in the future. Appendix 3 provides a summary of the nature and condition of flood defences in Poole, based on EA information contained in the Poole Bay, Poole Harbour and Wareham Flood and Coastal Erosion Risk Management Strategy (January 2014).

16 NPPF (March 2012): Paragraph 17. Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 56 168. The existing strategy for development, set out in the Core Strategy (February 2009), required a significant proportion of development, particularly housing, to be located in the Town Centre and Twin Sails regeneration area. This element of the strategy was the subject of a sequential and exemption test to justify the need for development in these areas at high risk of flooding. The strategy also required that key harbourside development sites within the study area (see Figure 18), were required to include the construction of strategic flood defences to not only defend the site itself, but also the wider town centre from flood risk, to 100 years beyond the plan period. 169. To date, the Council’s strategy for the protection of the Old Town area of Poole from the risk of flooding has relied on the delivery of strategic flood defences as integral components of developments on regeneration sites on West Quay Road and fronting the Back Water Channel. These long-standing allocated sites represent a ‘gap’ in central Poole’s flood defences which leaves the Old Town of Poole vulnerable to tidal flooding. Whilst two sites on West Quay Road have secured planning permission, their development and the future development of residual sites remain uncertain and the risk of flooding to the Old Town area remains. Should these sites remain undeveloped, it would be prudent for the Council, in conjunction with the Environment Agency and other relevant bodies, to consider how this situation can be remedied through the exploration of alternative options to the delivery of strategic flood defences. 170. The Council could adopt an ‘adaptive management’ approach, similar to that used for publicly funded flood defence schemes, i.e. Poole Quay, where defences are raised over time to provide sufficient protection from anticipated rises in sea level. Whilst this approach may offer some benefit by reducing the initial capital cost to the developer, a mechanism would be required to secure funds for raising defences in future years. This approach would also allow flexibility in the delivery of future improvements to flood defences based on future guidance on sea level rise, which could be subject to change. However, the Council’s Flood Risk Management Strategy (2011), will need to be revised to include an examination of the practicality, costs and future deliverability of this, or any other alternative approach. Analysis of Flood Risk within the Poole Town Centre and Twin Sails regeneration area Sequential Test application area – current day to 2133 171. The following section provides a detailed analysis of the scale and nature of flood risk across the Town Centre and Twin Sails regeneration area sequential test application area, for the following scenarios:- 1) current day with existing defences; 2) at 2060, the design period for flood defences on Poole Quay delivered under the adaptive management approach, and with all other town centre/Twin Sails regeneration area flood defences delivered to a level to mitigate sea level rise to 100 years beyond the plan period i.e. 2133; 3) at 2093, with flood defences delivered and Poole Quay defended to a level of 3.6 metres AOD; 4) at 2133, with defences as at 2093 level but with additional allowance for sea level rise as a consequence of climate change; 5) at 2133, to include additional flood defences at critical locations aimed at mitigating flood risk to the town centre, regeneration area sites and Lower Hamworthy. 172. Detailed modelling, created using Innovyze InfoWorks ICM software, for each of these scenarios follows, showing modelled flood extents for a 1:200 year tide event using a typical mean high water spring tide (MHWST) curve to provide inundation depths and flow paths.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 57 The modelled outputs include a climate change allowance (see Table 7), appropriate for the epoch being considered. Note that the black figures on the following maps are the given levels, in metres AOD, of the defences that are in place, either known from current structures, ‘as built’ drawings or assumed from development/planning applications or as part of the future phased raising of existing flood defences i.e. Town Quay. Larger scale maps of Figures 19 -23 at A3 size are included at Appendix 5. Scenario 1: Current day with existing defences 173. This scenario shows the areas at current day risk from flooding with existing flood defence assets in place. 174. The principal area of current day flood risk is associated with the vacant regeneration sites on West Quay Road (see Figure 19). Without the benefit of strategic flood defences that development of these sites would deliver, flood water would be able to flow across these sites and along West Quay Road, inundating sewers in this relatively low lying area. Flood waters would also flow northwards and eastwards from the area around Poole Lifting Bridge, exacerbating flooding to West Quay Road and flooding properties behind Poole Quay, sections of which have, and are due to be raised to provide protection to at least 2060. However, this area will remain vulnerable until the regeneration sites along West Quay Road are developed, or an alternative solution is delivered. 175. The area of Hamworthy to the south of Poole Lifting Bridge is also an area currently vulnerable to flooding. However, current repairs/renovations to the Bridge and the potential development of the adjoining Sydenham’s site provide the opportunity to improve quayside defences and raise ground levels to provide appropriate flood risk mitigation. 176. Poole Port, due to its relatively low lying topography, is vulnerable to flooding and as can be seen from the future flood risk scenarios that follow, will provide a source of flood risk of increasing severity to the Lower Hamworthy area as a consequence of the predicted rise in sea level over the period to 2133. 177. In a similar vein, properties to the north of Hamworthy Park, whilst currently at limited risk of flooding due to existing defences (delivered by the EA), will become increasingly vulnerable to the risk of flooding through tidal flood waters flowing around the back of the defences through private residential properties to the west of Hamworthy Park.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 58 Figure 19: Flood extents for a current day 1:200 year tide event

Scenario 2: 2060 178. The 2060 scenario is included as it represents the design period for publicly funded flood defences on Poole Quay, delivered under an adaptive management approach, whereby flood defences are incrementally improved when necessary, over time. Under this arrangement, flood walls to Poole Quay, once completed, will provide a flood defence wall to a continuous design height of 2.4 metres AOD, from Green Gardens to Poole Lifting Bridge. This scenario also assumes that planned developments have been delivered on the regeneration area sites to the west of West Quay Road, thereby providing a new continuous quay wall to a height of 3.6 metres AOD, from Poole Lifting Bridge through to the RNLI’s defences. It further assumes that the developments to the former power station site and the Pilkington’s and Sydenham’s sites have also been completed, with defences delivered to a design level of 3.6 metres AOD, from Poole Lifting Bridge to the boundary at Carter Community School, adjoining the former power station site. All outfalls are assumed to have been fitted with flap valves to prevent tidal ingress through the sewer network. The 3.6 metre AOD design level is that required to provide flood protection to housing development sites to 100 years beyond the period of the Local Plan, once adopted, i.e. 2133. 179. Modelling for this scenario shows that the delivery of all planned flood defences significantly improves the situation in relation to flood risk to West Quay Road and to the area to the north of Poole Quay. As noted previously, flood risk associated with Poole Port and the area to the north of Hamworthy Park has worsened as a consequence of the predicted rise in sea level over the period in question. 180. The modelling indicates that at its existing level, the revetment to the southern end of Holes Bay Road and to the north of Lifeboat Quay becomes an area of flood risk, with flood waters Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 59 flowing overland across the Hunger Hill Roundabout as far as the Dolphin Centre. Part of the Asda site would also be affected. 181. The RNLI site on West Quay Road, due to its lower level of flood defences, would be subject to flood risk of increasing severity. Protection off-site is afforded by raised site levels and landscaping and Quay/boundary walls. The car park is currently at greatest risk due to topographic levels. 182. At 2060, flood risk is present at Poole Quay from Dolphin Quays eastwards, although this would be alleviated by a further raising of the Poole Quay flood defences planned for post 2060. 183. It is worth noting that flooding is predicted to the east of the town centre at Baiter Park, as a result of the flow of tidal flood waters from the Parkstone Yacht Club/Turks Lane area, westwards across Whitecliff Harbourside Park and onto Baiter Park.

Figure 20: Flood extents for a 1:200 year tide event in 2060 assuming Poole Quay defended to at least 2060 and all other town centre/regeneration area sites defended to 2133

Scenario 3: 2093 184. Scenario 3 represents a point 60 years beyond the end of the local plan period, which is generally accepted as being the design life span of commercial development. 185. Flood defences on the Town Quay, extending from the RNLI Poole Lifeboat Station Museum through to Poole Lifting Bridge are assumed to have been raised through a further phase under the adaptive management approach, to a level of 3.6 metres AOD. The significant extent of flood inundation to the town centre is due to breaching in the area of Green

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 60 Gardens, with flood water entering and following the gradients of the sewer system and flowing overland along roads over the relatively flat, low lying areas of the town centre. 186. Flood risk, previously noted on the 2060 scenario originating from the southern end of Holes Bay Road, would worsen, flowing eastwards along the line of the railway to affect the Seldown and Pitwines areas. 187. The severity of flood risk associated with Poole Port and the area to the north of Hamworthy Park worsens as a consequence of the predicted rise in sea level. 188. The modelling predicts that flood risk would emerge to the west of the former power station site, flowing around the back of the defences to the north of Carter Community School.

Figure 21: Flood extents for a 1:200 year tide event in 2093

Scenario 4: 2133 - assuming defences at 2093 levels but with applicable sea level rise allowances resulting from climate change 189. The scenario for 2133 assumes that flood defence levels remain the same as in 2093, but takes account of the predicted rise in sea level as a consequence of climate change. The situation remains largely the same as that experienced in 2093, except that the extent and depth of flooding is greater due to the predicted rise in sea level and the relatively flat topography of the town centre and Lower Hamworthy areas.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 61 Figure 22: Flood extents for a 1:200 year tide event in 2133

Scenario 5: As 2133 but with additional flood defences provided in critical locations 190. This scenario considers the effect that implementing additional flood defence measures in critical locations could have on protecting the town centre and Twin Sails regeneration area from flooding based on the 2133 outcomes. Modelling has been undertaken that includes additional flood defence measures in the following locations:-  the southern end of the Holes Bay Road;  Baiter Park/Whitecliff Harbourside Park frontage (from Green Gardens to Turks Lane); and  Lower Hamworthy (from the Poole Lifting Bridge to where it meets the existing flood defence at the eastern extent of Hamworthy Park). Raising the revetment at the southern end of the Holes Bay Road 191. Raising the revetment to a height of 3.6 metres AOD at the southern end of the Holes Bay Road provides an effective flood defence measure, protecting the town centre shopping area and preventing the flow of flood water overland along the line of the railway to the Seldown and Pitwines areas. It would also prevent the flow of flood waters northwards to the Sterte Avenue West area. The revetment could be raised incrementally over time using an adaptive management approach, whereby defences are improved as necessary, over time. Raising the revetment/flood wall to the Baiter Park/Whitecliff Harbourside Park frontage 192. The effectiveness of this flood defence measure is compromised by the ability of flood water to flow round the back of the raised revetment/flood wall at the junction of Turks Lane and the entrance to Parkstone Yacht Club. The gap at this point would allow flood waters to flow

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 62 across Whitecliff Harbourside Park and Baiter Park and from there flow along Green Road, entering the sewer system and into eastern areas of the town centre. Flood barrier in Lower Hamworthy 193. The aim of this flood defence option is to protect areas of Lower Hamworthy from flood risk arising from the Poole Port estate. Whilst the modelling outcomes suggest this would be largely successful, it is substantially negated by flood waters flowing overland from around the western end of the former power station flood defence to the north and around the back of the defences at Hamworthy Park, through private residential properties to the west.

Figure 23: Flood extents for a 1:200 year tide event in 2133 but with additional flood defences provided in critical locations

194. In respect of these issues, there is a recognition that raised flood defences will be required post 2060 to defend properties that back onto the Holes Bay shoreline, from the railway embankment adjacent to Symes Road, through to the flood defences that will be delivered by the former power station development. Potential solutions to dealing with the predicted flood risk circumventing flood defences at Hamworthy Park could include:  securing incremental improvements by raising ground levels/flood defences as properties adjacent to the shoreline of Poole Harbour and fronting Branksea Avenue are redeveloped, over time;  securing agreement to implement a comprehensive flood defence scheme to the rear boundaries of private residential properties adjacent to the shoreline of Poole Harbour and fronting Branksea Avenue from Lake Road to Hamworthy Park; or  providing temporary flood defence measures, during high flood risk events, along Branksea Avenue from Lake Road to the point where they would join the existing Hamworthy Park flood defence scheme.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 63 195. It will be essential that these matters are fully considered through the planned update to the Poole Flood Risk Management Strategy to ensure that these areas are effectively protected from future flood risk. Summary conclusions 196. The revised Level 1 SFRA (Part 1 of this document), in common with the 2009 Level 1 SFRA, has established that that the development needs of Poole, primarily for housing, cannot be wholly accommodated in areas of low flood risk. The Town Centre and Twin Sails regeneration area, although at current and future risk of flooding, provide the only available locations for development of the scale required to help meet Poole’s needs. These areas provide significant opportunities to promote growth through redevelopment and regeneration and would deliver nearly a third of Poole’s housing needs, creating new communities in these highly sustainable locations close to key public transport facilities, town centre shopping facilities and a range of employment opportunities. However, development in these areas would be dependent on the construction of strategic flood defences, primarily delivered through the development of key regeneration sites either side of the Backwater Channel, which links Poole Harbour and Holes Bay. 197. Part 2 of this document, a Level 2 SFRA, provides the Sequential Test of the Town Centre and Twin Sails regeneration area. It provides an analysis of the sources of housing supply, which clearly demonstrates that without development in the Town Centre and Twin Sails regeneration area, Poole could not meet its forecast requirement for housing. The Level 2 SFRA further details the sites considered for allocation within a defined Sequential Test study area, the boundary of which has been agreed with the Environment Agency. Based on the results of public consultation and discussions with landowners, a number of sites have been promoted for allocation. On the basis that the Sequential Test has been passed, the Exception Test has also been applied to the study area. 198. In order to understand the nature and extent of flood risk to the Town Centre and Twin Sails regeneration area over time, a number of scenarios have been modelled which examine the possible outcomes in relation to a 1:200 year tidal event (including allowances to take account of the consequences of sea level rise resulting from climate change), taking into account existing and planned flood defences. The scenarios provide a detailed analysis of future flood risk based on the assumption that flood defences will be delivered that will protect the Town Centre and Twin Sails regeneration area over the period to 2133 (100 years beyond the end of the Local Plan period). 199. These scenarios demonstrate that although the provision of planned defences have a positive outcome in reducing the risk of flooding to key areas within the Sequential Test study area, there are critical locations that without the provision of additional flood defences to those already planned, will pose a significant threat of flooding to much of the Town Centre and Twin Sails regeneration area. 200. Scenario 5 examines how additional flood defence measures could protect the Town Centre and Twin Sails regeneration area in these critical areas. Whilst the modelling suggests these additional measures would be in large part successful, there remain issues that will need to be resolved to make the protection of these areas effective up to 2133. 201. It will be crucial therefore, that the planned update to the Flood Risk Management Strategy fully examines the implications of defending these critical locations, to ensure that the Town Centre and Twin Sails regeneration area are effectively protected from future flood risk.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 64 Sequential Test of other site allocations 202. In addition to the sites within the town centre, the proposed allocation for employment uses at Sterte Avenue West is also at risk of flooding by 2133. 203. This site is the subject of an individual Sequential Test to justify its inclusion as a site allocation in the draft Poole Local Plan. 204. The Sequential Test has been undertaken on a different basis to that forthe town centre/regeneration area sites, as its proposed allocation is for employment uses and as such is considered over a sixty year design life time frame beyond the end date of the plan period i.e. 2093, not the 100 years used for residential development. Application of the Sequential Test and Exception Test outside of the Town Centre study area 205. Outside of the Town Centre and Twin Sails regeneration Sequential Test study area, development proposed within areas of existing (Flood Zones 2 and 3) or future risk of flooding (2133 Future Flood Risk Zone), must apply the Sequential Test in line with guidance set out in PPG. The area for the application of the Sequential Test in all cases will be the administrative area covered by the Borough of Poole. 206. It should be noted that even in areas at low risk of flooding (Flood Zone 1), there may be circumstances where the Sequential Test (and the Exception Test) may need to be applied, for example, where other sources of flood risk to the site are identified. 207. For applications where the site boundary (defined by a red line on the site plan accompanying a planning application), includes areas of Flood Zones 1 and 2 and/or 3 and the 2133 Future Flood Risk Zone, the consideration of whether the application of the Sequential Test will apply will depend on the nature and layout of the development proposed. Where more vulnerable uses, such as housing, are proposed to be located in Flood Zones 2 and 3 or the 2133 Future Flood Risk Zone, then the whole site would be subject to the Sequential Test. Where more vulnerable uses can be accommodated in areas of the site at low risk of flooding and where safe access and egress can be secured throughout the life time of the development, a site-specific FRA will be required that addresses any residual flood risk issues.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 65 10. Glossary of Terms Term Description Above Ordnance Datum A vertical datum used by an ordnance survey as the basis for deriving altitudes on (AOD) maps. A spot height may be expressed as AOD for "above ordnance datum". Aquifer A body of permeable rock which can contain or transmit groundwater. Catchment An area drained by a specific river/watercourse. Community A planning charge, introduced by the Planning Act 2008 as a tool for local authorities to Infrastructure Levy (CIL) help deliver infrastructure to support the development of their area. Civil Contingencies Act Legislation that establishes a coherent framework for emergency planning and response 2004 ranging from local to national level. Climate change A change in global or regional climate patterns, in particular a change apparent from the mid to late 20th century onwards and attributed largely to the increased levels of atmospheric carbon dioxide produced by the use of fossil fuels. Coastal flooding Occurs when coastal areas are flooded by the sea. Development The carrying out of building, engineering, mining or other operations in, on, over or under land or the making of any material change in the use of any buildings or other land. Exception Test A method used to demonstrate and help ensure that flood risk to people and property will be managed satisfactorily, while allowing necessary development to go ahead in situations where suitable sites at lower risk of flooding are not available. Flood defence Infrastructure such as flood walls and embankments, intended to protect an area against flooding to a designed level of protection. Flood risk assessment A study that assess the risk of a site or area flooding, and to assess the impact that any changes or development in the site or area will have on flood risk. Flood Risk Management Study providing a strategic review of flood risk to 100 years beyond the Local Plan Strategy timeframe, the purpose of which is to provide a robust and defendable long term framework to inform decisions on flood risk issues. Fluvial flooding Flooding resulting from water levels exceeding the bank level of a main river. Functional floodplain Land where water has to flow or be stored in times of flood. Groundwater Water found underground in the cracks and spaces in soil, sand and rock. Usually refers to water in the saturated zone below the water table. Groundwater flooding Flooding which occurs when the water table in permeable rocks rises to enter basements/cellars or comes up above the ground surface. Lead Local Flood Local Authority responsible for taking the lead on local flood risk management. Authority (LLFA) Local Flood Risk Strategy required under the Flood and Water Management Act and prepared by a LLFA Management Strategy to develop, maintain, apply and monitor a strategy for local flood risk management. Local Planning Authority The local authority or council that is empowered by law to exercise statutory town (LPA) planning functions for a particular area. Local Resilience Forum A multi-agency partnership formed by key emergency responders and specific (LRF) supporting agencies as required by the Civil Contingencies Act 2004. Main River A watercourse shown as such on the Main River Map, and for which the Environment Agency has responsibilities and powers. National Planning Policy Government guidance for local planning authorities and decision-takers, and used in Framework (NPPF) drawing up plans and making decisions about planning applications. Objectively Assessed Requirement of the NPPF that local planning authorities identify objectively assessed Need (OAN) housing need (the OAN), and translates those needs into land provision targets in Local Plans. Planning Practice Web-based resource which brings together planning guidance on various topics into one Guidance (PPG) place. Return Period The time that passes on average between consecutive events of similar magnitude for a given location.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 66

Term Description Sequential Test A risk-based approach to flood risk assessment that seeks to steer new development to areas with the lowest probability of flooding in accordance with the National Planning Policy Framework. Still Water Level Sea level including the tide, surge and mean sea level elements, but not including waves. Strategic Flood Risk An evidence base study that assesses the risk to an area from flooding from all sources, Assessment (SFRA) now and in the future, taking account of climate change, and to assess the impact that land use changes and development in the area will have on flood risk to locate new development primarily in low flood risk areas mapped using local data collected from many sources. Surface water flooding Flooding caused when the volume of rainwater falling does not drain away through the existing drainage systems or soak into the ground, but lies on or flows over the ground instead. This type of flooding is usually short lived and associated with heavy downpours of rain, thunder storms etc. Sustainable Systems designed to reduce the potential impact of new and existing developments with Drainage Systems respect to surface water drainage discharges. Such systems aim to mimic nature and (SuDS) typically manage rainfall close to where it falls. Sustainability Appraisal An appraisal of plans, strategies and proposals against relevant sustainability (SA) objectives relating to environmental, economic and social lissues. Watercourse Any natural or artificial channel that conveys surface water. Water table The level of groundwater in soil and rock, below which the ground is saturated.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 67 Appendix 1 - Flood Risk Vulnerability Classification Essential Infrastructure  Essential transport infrastructure (including mass evacuation routes) which has to cross the area at risk.  Essential utility infrastructure which has to be located in a flood risk area for operational reasons, including electricity generating power stations and grid and primary substations; and water treatment works that need to remain operational in times of flood.  Wind turbines. Highly Vulnerable  Police and ambulance stations; fire stations and command centres; telecommunications installations required to be operational during flooding.  Emergency dispersal points.  Basement dwellings.  Caravans, mobile homes and park homes intended for permanent residential use.  Installations requiring hazardous substances consent. (Where there is a demonstrable need to locate such installations for bulk storage of materials with port or other similar facilities, or such installations with energy infrastructure or carbon capture and storage installations, that require coastal or water-side locations, or need to be located in other high flood risk areas, in these instances the facilities should be classified as ‘Essential Infrastructure’). More Vulnerable  Hospitals  Residential institutions such as residential care homes, children’s homes, social services homes, prisons and hostels.  Buildings used for dwelling houses, student halls of residence, drinking establishments, nightclubs and hotels.  Non–residential uses for health services, nurseries and educational establishments.  Landfill* and sites used for waste management facilities for hazardous waste.  Sites used for holiday or short-let caravans and camping, subject to a specific warning and evacuation plan. Less Vulnerable  Police, ambulance and fire stations which are not required to be operational during flooding.  Buildings used for shops; financial, professional and other services; restaurants, cafes and hot food takeaways; offices; general industry, storage and distribution; non-residential institutions not included in the ‘More Vulnerable’ class; and assembly and leisure.  Land and buildings used for agriculture and forestry.  Waste treatment (except landfill* and hazardous waste facilities).  Minerals working and processing (except for sand and gravel working).  Water treatment works which do not need to remain operational during times of flood.  Sewage treatment works, if adequate measures to control pollution and manage sewage during flooding events are in place. Water-Compatible Development  Flood control infrastructure.  Water transmission infrastructure and pumping stations.  Sewage transmission infrastructure and pumping stations.  Sand and gravel working.  Docks, marinas and wharves.  Navigation facilities.  Ministry of Defence defence installations.  Ship building, repairing and dismantling, dockside fish processing and refrigeration and compatible activities requiring a waterside location.  Water-based recreation (excluding sleeping accommodation).  Lifeguard and coastguard stations.  Amenity open space, nature conservation and biodiversity, outdoor sports and recreation and essential facilities such as changing rooms.  Essential ancillary sleeping or residential accommodation for staff required by uses in this category, subject to a specific warning and evacuation plan. * Landfill is as defined in Schedule 10 to the Environmental Permitting (England and Wales) Regulations 2010.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 68 Appendix 2 - Site Assessment Flood Risk Summary Note: Percentages quoted on sites at risk from tidal flooding relate to the area of the site affected.

Tidal Flooding

Future Fluvial Flood Risk Flood Flood Flood Flood Flooding Groundwater Old Site New Site Area Proposed Possible Vulnerability Zone Zone Zone Zone (River/ Surface (susceptibility Reference Reference Site Name (ha) Use Dwellings Classification 1 2 3 (2133) Streams) Water /risk category) SuDS Comments

Existing sites allocated for development Housing and More/less Potentially Adjacent to section of West Quay Road shown on EA mapping as PCS11a T8 North of Twin Sails Bridge 1.6 550       High commercial vulnerable Viable at risk of surface water flooding. Potentially Adjacent to section of West Quay Road shown on EA mapping as PCS11b T9 Between the Bridges 1.8 Housing 450 More vulnerable       High Viable at risk of surface water flooding. Housing and More/less     Potentially PCS11c T10 / T11 Pilkington Tiles and Sydenhams 4.0 460   High commercial vulnerable (44%) (56%) (50%) (34%) Viable Impractical     Small areas on site and on adjacent sites shown on EA mapping PCS11d T7 Former Hamworthy Power Station 15.3 Housing 900 More vulnerable   High /Potentially (55%) (45%) (6%) (92%) as at risk of surface water flooding. Viable Housing and More/less Negligible/ Potentially Minor area of site shown on EA mapping as at risk of surface SSA4 U4 Crown Closures, Hamworthy 2.9 155       employment vulnerable Low/High Viable water flooding.  Potentially Adjacent to minor areas of Lagland Street/North Street shown on SSA11 T14 Lagland Street 2.7 Housing 40 More vulnerable      High (96%) Viable EA mapping as at risk of surface water flooding. Housing and More/less Section of north-eastern boundary shown on EA mapping as at SSA12 T3 Goods Yard 2.9 300       Low Viable offices vulnerable risk of surface water flooding. Housing, More/less    Potentially Adjacent to sections of Fishermans Road/East Quay Road shown SSA14 T12 East Quay Depot and Quay Thistle Hotel 1.2 hotel 180    Medium vulnerable (50%) (50%) (17%) Viable on EA mapping as at risk of surface water flooding. and retail Viable/ Housing Eastern area of site and junction with Constitution Hill Road SSA17 U11 Bournemouth and Poole College site 1.7 55 More vulnerable       Negligible Potentially including care shown on EA mapping as at risk of surface water flooding. Viable Housing SSA18 U13 St Marys Maternity Hospital 0.8 including care 50 More vulnerable       Low Viable and health SSA19 Bourne House, Langside Avenue 0.7 Care home 60 More vulnerable       Low Viable

More/less SSA20 E1 Talbot Village 5.7 Mixed uses 450       Not classified Viable vulnerable Housing, retail and More/less  Potentially Adjacent to section of Blandford Road shown on EA mapping as SSA23 PQF 6 & 7 Hamworhty Local Centre 1.9 10      High community vulnerable (22%) Viable at risk of surface water flooding. uses  

Possible new sites in the urban area Housing and More/less  Potentially Minor area to south west boundary of site shown on EA mapping A1 Dolphin Pool and car park 1.3      Medium Pool vulnerable (8%) Viable as at risk of surface water flooding. T1 500  Potentially Minor areas of site shown on EA mapping as at risk of surface A2 Seldown Car Parks 3.8 Housing More vulnerable      Medium (93%) Viable water flooding. Low/ Adjacent to section of Kingland Road/George Roundabout shown A3 T5 Former Nat West bank 0.3 Housing 150 More vulnerable       Viable Medium on EA mapping as at risk of surface water flooding. Housing and More/less  Sections of site shown on EA mapping as at risk of surface water A4 T2 / T4 Stadium and St. Johns House 4.4 630      Low Viable new stadium vulnerable (32%) flooding. A5 T6 6-26 Wimborne Road 0.25 Housing 50 More vulnerable       Low Viable

Potentially Central area of site shown on EA mapping as at risk of surface A6 U6 Sopers Lane 4.0 Housing 100 More vulnerable       Low Viable water flooding. Potentially A7 U7 2 Mitchell Road 0.8 Care Home 80 More vulnerable       Negligible Viable Housing and More/less Potentially A8 Hunger Hill junction tbc 80  tbc     Medium offices vulnerable Viable Potentially A9 T14 High Street 1.2 Housing 20 More vulnerable       Medium Viable Minor areas in and around St. George's Avenue shown on EA A10 U15 Ringwood Road 7.8 Housing 40 More vulnerable       Negligible Viable mapping as at risk of surface water flooding.

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 69 Tidal Flooding

Future Fluvial Flood Risk Flood Flood Flood Flood Flooding Groundwater Old Site New Site Area Proposed Possible Vulnerability Zone Zone Zone Zone (River/ Surface (susceptibility Reference Reference Site Name (ha) Use Dwellings Classification 1 2 3 (2133) Streams) Water /risk category) SuDS Comments A11 U8 Beach Road car park 0.4 Housing 60 More vulnerable       Negligible Viable Housing and Minor area within and adjacent areas on Blandford Road/Turlin 8.7 More/less     Medium/ A12 U1 Turlin Moor Recreation Ground community 350   Impractical Road/Keysworth Road shown on EA mapping as at risk of surface (26.4) vulnerable (98%) (2%) (0.25%) (3%) Negligible uses water flooding. Care home Minor area towards eastern boundary of site shown on EA A13 U5 Parrs Confectionary site 0.8 102 More vulnerable       Negligible Viable and care flats mapping as at risk of surface water flooding. No's 1, 3, 13-21 & southern end of Lindsay Road shown on EA A14 1-23 Lindsay Road 3.7 Housing 60 More vulnerable       Not classified Viable mapping as at risk of surface water flooding. Retail/ More/less    Potentially Adjacent to small section of Strand Street shown on EA mapping A15 13-15 High Street 0.2 16    High Housing vulnerable 41%) (59%) (6%) Viable as at risk of surface water flooding. Potentially A16 Corfe House 0.2 Housing 120 More vulnerable       Medium Viable    Potentially Adjacent to section of West Quay Road shown on EA mapping as A17 Patrick House 0.3 Housing 40 More vulnerable    High (17%) (83%) (76%) Viable at risk of surface water flooding. Minor area towards northern boundary of site and adjacent    Potentially A18 Westover House 0.5 Housing 80 More vulnerable    High section of West Quay Road shown on EA mapping as at risk of (9%) (91%) (33%) Viable surface water flooding. Area running north to south across site adjacent to Civic Centre A19 U3 Civic Centre and public buildings 3.1 Housing 250 More vulnerable       Low Viable main entrance shown on EA mapping as at risk of surface water flooding. Housing and A20 U9 Oakdale public buildings 1.0 community 60 More vulnerable       Negligible Viable uses A21 Albert Road car park 0.3 Housing 20 More vulnerable       Negligible Viable Employment More/less Medium/ Potentially Southern and western areas of site shown on EA mapping as at A22 Cabot Lane 2.3 250       and housing vulnerable Low Viable risk of surface water flooding. Potentially Adjacent to section of Old Orchard shown on EA mapping as at A23 T15 Poole Pottery 0.2 Housing 50 More vulnerable       Medium Viable risk of surface water flooding. Potentially No's 77-79 on the Kinson Pottery Estate shown on EA mapping A24 Pottery Industrial Estate 5.8 Housing 300 More vulnerable       Negligible Viable as at risk of surface water flooding. Potentially Minor area to the northern section of the site shown on EA A25 Sterte Avenue 0.6 Housing 20 More vulnerable       High Viable mapping as at risk of surface water flooding. Employment More/less Significant proportion of northern half of site shown on EA A26 E5 / U10 Gasworks, Bourne Valley 4.5 100       Negligible Viable or care home vulnerable mapping as at risk of surface water flooding. Housing, retail and More/less Potentially Minor area towards western boundary of site shown on EA A27 U12 Creekmoor Local Centre 1.7 50       Negligible community vulnerable Viable mapping as at risk of surface water flooding. uses Housing and Potentially A28 Car park, Broadstone 0.2 20 More vulnerable       Negligible car park Viable Housing and Minor area on adjacent properties 11-17 Hillcrest Road to the A29 Sea View Centre 0.8 community 50 More vulnerable       Negligible Viable south of the site shown on EA mapping as at risk of surface water uses flooding. Potentially Areas adjacent to the western and southern boundaries of the site A30 Land adjacent Magna Academy 0.7 Housing 50 More vulnerable       Low Viable shown on EA mapping as at risk of surface water flooding. Housing and More/less A31 2-10 Haven Road 0.2 20       Negligible Viable retail vulnerable

Other possible development sites

Land at Bournemouth Water Ltd., Potentially SSA5 E7 1.4 Employment n/a Less vulnerable       Negligible Francis Avenue Viable Potentially Two very minor areas to southern boundary of the site shown on SSA6 E3 Land at Sterte Avenue West 4.8 Employment n/a Less vulnerable       High Viable EA mapping as at risk of surface water flooding.    Potentially SSA13 E12 Land at Lifeboat Quay 0.5 Employment n/a Less vulnerable    High (60%) (40%) (20%) Viable     Low/ Potentially E1 E11 Marshes End 0.9 Employment n/a Less vulnerable   (11%) (89%) (78%) (99%) Medium Viable Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 70 Tidal Flooding

Future Fluvial Flood Risk Flood Flood Flood Flood Flooding Groundwater Old Site New Site Area Proposed Possible Vulnerability Zone Zone Zone Zone (River/ Surface (susceptibility Reference Reference Site Name (ha) Use Dwellings Classification 1 2 3 (2133) Streams) Water /risk category) SuDS Comments Medium/ Potentially Two very minor areas on the site shown on EA mapping as at risk E2 E10 Land at the Fulcrum, Vantage Way 1.0 Employment n/a Less vulnerable       Negligible Viable of surface water flooding.    Medium/ Potentially E3 E9 Land at Banbury Road 1.4 Employment n/a Less vulnerable    (50%) (63%) (50%) Negligible Viable Potentially E4 E6 Land at Innovation Close 2.2 Employment n/a Less vulnerable       Negligible Viable Potentially Small section of Ling Road adjacent to southern end of the site E5 E14 Area 2, Ling Road 1.7 Employment n/a Less vulnerable       Low Viable shown on EA mapping as at risk of surface water flooding. Potentially Small section of Yarrow Road adjacent to western boundary of E6 E8 Land south east of Yarrow Road 1.4 Employment n/a Less vulnerable       Negligible Viable the site shown on EA mapping as at risk of surface water flooding. Potentially Minor area on site and areas to the east and west adjacent to the E7 Magna Business Park 5.2 Employment n/a Less vulnerable       Medium Viable site shown on EA mapping as at risk of surface water flooding.     Potentially PC3 PP19 / E4 Poole Port 32.8 Employment n/a Less vulnerable   High/Low Minor areas across the Port estate. (56%) (44%) (34%) (79%) Viable Minor area on site boundary adjoining Upton Road and similar to High/ Potentially CF1 A2 South of Creekmoor 16.3 Education n/a More vulnerable       boundary with Northmead Copse shown on EA mapping as at risk Medium Viable of surface water flooding. Low/ Potentially Minor areas within the site adjacent to the western boundary, SSA21 PP35(a) Park & Ride site, Mannings Heath 5.31 Transport n/a Less vulnerable       Negligible Viable shown on EA mapping as at risk of surface water flooding. Retail/    High/ Potentially Minor areas on Broadstone Way adjacent to eastern end of site R1 Land north of Wessex Gate Retail Park 2.4 n/a Less vulnerable    Employment (89%) (50%) (11%) Medium Viable shown on EA mapping as at risk of surface water flooding.

Possible sites to expand the town outwards Housing or Potentially B1 Oaks Garden Centre 1.7 50 More vulnerable       Negligible care home Viable Medium/ Potentially Three very minor areas within the boundary of the site shown on B2 Merley Park 38.6 Housing 1200 More vulnerable       Low Viable EA mapping as at risk of surface water flooding. Potentially Site bisected by narrow ribbon running from north to south west B3 UE1 North of Oakley Lane (Cruxton Farm) 24.8 Housing 575 More vulnerable       Low Viable shown on EA mapping as at risk of surface water flooding.   Potentially Site bisected along line of stream running north-east to south west B4 South of Queen Anne Drive 42.9 Housing 100 More vulnerable     Negligible (91%) (9%) Viable shown on EA mapping as at risk of surface water flooding. Potentially B5 Rear of Merley Ways 1.5 Housing 30 More vulnerable       Medium Viable Potentially B6 Land off the B3073, Merley 1.2 Housing 25 More vulnerable       Medium Viable Potentially Minor area on site and areas to the east and west adjacent to the B7 Magna Business Park 11.8 Housing 320 More vulnerable       Medium Viable site shown on EA mapping as at risk of surface water flooding. Housing and More/less Medium/ Potentially Several minor areas within site and along along Knighton Lane B8 UE2 Canford Park 95.2 community 2500       vulnerable High Viable shown on EA mapping as at risk of surface water flooding. infrastructure Potentially B9 Moortown Aerodrome 9.4 Housing 850 More vulnerable       Medium Viable

Additional sites Two minor areas encroach, two lie adjacent and section of    Potentially T13 Skinner Street and surrounds 6.0 Housing 100 More vulnerable    Medium Skinner Street shown on EA mapping as at risk of surface water (47%) (53%) (13%) Viable flooding. Potentially Minor areas of the site, particularly adjacent to Kitchener Crescent U16 Hillbourne School site 4.7 Housing (part) 40 More vulnerable       Low Viable shown on EA mapping as at risk of surface water flooding. Negligible/ Potentially U14 Land west of Roberts Lane, Creekmoor 2.7 Housing 45 More vulnerable       Medium Viable Very minor area on site and areas to the east and west adjacent Potentially U2 Land south of Magna Road 13.34 Housing 324 More vulnerable       Medium to the site shown on EA mapping as at risk of surface water Viable flooding. Potentially E2 Magna Business Park 4.56 Employment n/a Less vulnerable       Medium Viable

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 71 Appendix 3 – Nature and condition of flood defences and coastal erosion protection structures in Poole

(Reproduced from Table 3.2 of the Poole Bay, Poole Harbour and Wareham Flood and Coastal Erosion Risk Management Strategy – Environment Agency (January 2014).

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Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 72 Appendix 4 – Areas in Poole at future risk of tidal flooding by 2133

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 73

Appendix 5 – Flood risk scenarios for the Town Centre and Twin Sails regeneration area: Current day to 2133 Scenario 1: Flood extents for a current day 1:200 year tide event

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 75

Scenario 2: Flood extents for a 1:200 year tide event in 2060 assuming Poole Quay defended to at least 2060 and all other town centre/regeneration area sites defended to 2133

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 77

Scenario 3: Flood extents for a 1:200 year tide event in 2093

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 79

Scenario 4: Flood extents for a 1:200 year tide event in 2133

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 81

Scenario 5: Flood extents for a 1:200 year tide event in 2133 but with additional flood defences provided in critical locations

Poole Local Plan. Level 1 & 2 Strategic Flood Risk Assessment. November2017 83

Poole Local Plan