1 A) Planning and Environmental Policy Group Revised Planning Policy Statement 15. Planning and Flood Risk'. September 2014. Contents .. 3. Introduction .. 5. Policy Context .. 8. Policy Objectives .. 15. The Role of Development Plans .. 17. Development Management Considerations .. 22. Planning Policies .. 26. Annex A: Impacts of Climate Change .. 51. Annex B: Impact of Flooding on People and 54. Annex C: Sustainable Drainage .. 58. Annex D: Assessing Flood Risk and Drainage Impact .. 67. Annex E: Flood Proofing - Resistance & Resilience 76.
2 Glossary ..82. 2. Preamble The Department has a statutory duty, laid down in Article 3 of the Planning (Northern Ireland) Order 1991, to formulate and co-ordinate Policy for securing the orderly and consistent development of land and for the Planning of that development. The Department is required to ensure such Policy is in general conformity with the Regional Development Strategy. The Department's Planning policies are normally issued through Planning Policy Statements (PPS) and PPS 1 General Principles' advises that: Planning Policy Statements set out the policies of the Department on particular aspects of land-use Planning and apply to the whole of Northern Ireland.
3 Their contents will be taken into account in preparing development plans and are also material to decisions on individual Planning applications and appeals.. This Planning Policy Statement, revised PPS 15 Planning and Flood Risk'. sets out the Department's draft Planning policies to minimise and manage flood risk to people, property and the environment. It embodies the government's commitment to sustainable development and the conservation of biodiversity. It adopts a precautionary approach to development and the use of land that takes account of climate change and emerging information relating to flood risk through the implementation of the EU Floods Directive in Northern Ireland and the implementation of sustainable drainage systems.
4 The revised PPS is supportive to the safety and wellbeing of people. The policies of this Statement will supersede the existing PPS 15, published in June 2006. The policies of this Statement will also take precedence over the provisions of existing development plans in relation to flood risk. 3. The policies in this Statement will be applied by the Department and subsequently by Councils upon the transfer of Planning functions. This PPS will inform the emerging Strategic Planning Policy Statement (SPPS) which in turn will provide a strategic Planning framework for Councils in bringing forward local development plans.
5 The PPS has been subjected to an equality impact screening exercise in line with the statutory obligation contained in Section 75 of the Northern Ireland Act 1998. The outcome of this exercise indicates that it is unlikely to have significant adverse implications for equality of opportunity or community relations. Nothing in this document should be read as a commitment that public resources will be provided for any specific project. All proposals for expenditure by the Department are subject to economic appraisal and will also have to be considered having regard to the overall availability of resources.
6 4. Introduction Background to Flood Risk in Northern Ireland Flooding is a natural phenomenon that cannot be entirely prevented. There are four main sources of flooding. Flooding from rivers or fluvial flooding occurs when the channel capacity is exceeded and flood waters overtop the river banks. Coastal flooding occurs when inundation of land takes place due to a combination of high tides, wave action and storm surge. Surface water or pluvial flooding occurs as a result of high intensity rainfall which can overwhelm drainage systems or cause water to collect in low lying areas.
7 Finally, flooding from impounded water bodies such as reservoirs and dams can arise as a result of overtopping or failure of the impounding structure which in turn may result in a sudden uncontrolled release of flood water into downstream areas. The effects of flooding on human activity are wide ranging. Floods have the potential to cause fatalities and injury, displacement of people, pollution and health risk, loss of drinking water, damage to buildings and the environment and to severely compromise economic activities.
8 If not properly managed, flooding to property will also impact on property prices, the ability to get a mortgage agreement and the availability of affordable property insurance. There is widespread potential in Northern Ireland for localised flooding. Significant flood events have occurred in the recent past. A description of these and some major historical flood events is contained in the Preliminary Flood Risk Assessment (PFRA) published by Rivers Agency (DARD) in December 2011. The PFRA estimates that 46000 or 5% of properties in Northern Ireland are located within fluvial and coastal floodplains.
9 Approximately 15500 of these properties are estimated to be protected by flood defences or culvert systems. In 5. addition it is estimated that around 20000 or some of properties are at risk of surface water flooding, albeit that many of these properties are already at risk of flooding from fluvial or coastal flooding. Climate change predictions of rising global temperatures will be accompanied by sea level rise, an increase in overall winter precipitation and an increase in intensity and duration of extreme rainfall events.
10 This, along with other factors such as the ongoing development of impermeable surfaces in urban areas, removal of vegetation and loss of open space, will, if continued, greatly increase the incidence of surface water flooding. The significant increase in the incidence of flood events across Europe and the associated impacts led to the adoption by the European Parliament of the Floods Directive ( The Assessment and Management of Flood Risk ) in October 2007. The Directive sets out a holistic, catchment based approach to manage flood risk in a sustainable way based on the impact all sources of flooding have on human health, the environment, cultural heritage and economic activity.