Irvine to Troon (Potentially Vulnerable Area 12/07)
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Irvine to Troon (Potentially Vulnerable Area 12/07) Local Plan District Local authority Main catchment Ayrshire North Ayrshire Council, Monkton to Irvine coastal South Ayrshire Council Summary of flooding impacts Summary of flooding impacts flooding of Summary At risk of flooding • 1,000 residential properties • 520 non-residential properties • £1.3 million Annual Average Damages (damages by flood source shown left) Summary of objectives to manage flooding Objectives have been set by SEPA and agreed with flood risk management authorities. These are the aims for managing local flood risk. The objectives have been grouped in three main ways: by reducing risk, avoiding increasing risk or accepting risk by maintaining current levels of management. Objectives Many organisations, such as Scottish Water and energy companies, actively maintain and manage their own assets including their risk from flooding. Where known, these actions are described here. Scottish Natural Heritage and Historic Environment Scotland work with site owners to manage flooding where appropriate at designated environmental and/or cultural heritage sites. These actions are not detailed further in the Flood Risk Management Strategies. Summary of actions to manage flooding The actions below have been selected to manage flood risk. Flood Natural flood New flood Community Property level Site protection protection management warning flood action protection plans scheme/works works groups scheme Actions Flood Natural flood Maintain flood Awareness Surface water Emergency protection management warning raising plan/study plans/response study study Maintain flood Strategic Flood Planning Self help Maintenance protection mapping and forecasting policies scheme modelling Ayrshire Local Plan District Section 2 96 Irvine to Troon (Potentially Vulnerable Area 12/07) Local Plan District Local authority Main catchment North Ayrshire Council, Ayrshire Monkton to Irvine coastal South Ayrshire Council Background This Potentially Vulnerable Area is There are approximately 1,000 located on the west coast of the residential properties and 520 non- Ayrshire Local Plan District between residential properties at risk of flooding. Monkton and Irvine. It is approximately The Annual Average Damages are 30km2 (shown below). approximately £1.3 million. River 70% Coastal 20% Surface water 10% Figure 1: Annual Average Damages by flood source © Crown copyright. SEPA licence number 100016991 (2015). All rights reserved. Summary of flooding impacts River flooding is predicted in Irvine from a number of small burns. One area shown to be at risk is Muirhead, with flooding attributed to the Darley Burn. This burn is culverted beneath the A759 which may cause flood water to collect upstream, affecting a number of residential properties. Sections of road and rail routes are also predicted to be impacted by flooding (notably the A78). The area has frontage onto the Firth of Clyde, with a number of areas at risk. The area with the highest projected risk is Troon Harbour between Port Ranald Drive and South Beach Esplanade, where a number of residential properties could experience coastal flooding. Historically at this location waves have overtopped seawalls and flood water has become trapped. Past reports indicate that the shorefront to the north of Troon has exhibited periods of accumulation and erosion of sand dunes. Interaction between sources of coastal and river flooding is expected to occur in the lower reaches of the River Irvine and Gailes Burn. There is also a possibility of interaction between river and surface water flooding around Muirhead. It is locally understood that flooding generally occurs during heavy rainfall and is accentuated by high tidal conditions. Surface water flooding is predicted to affect properties and transport routes in the area, with a potential interaction between river and surface water flooding. The areas at highest risk from surface water flooding require the preparation of surface water management plans. 97 Section 2 Ayrshire Local Plan District The risk of flooding to people and property, as well as to community facilities, utilities, the transport network, designated sites and agricultural land is summarised in Table 1. The damages associated with floods of different likelihood are shown in Figure 2. Residential properties affected by river flooding experience the highest economic impact at approximately 65% of the damages. Within this Potentially Vulnerable Area it is estimated that climate change will increase the number of residential properties at risk of flooding from approximately 1,000 to 1,600 and the number of non-residential properties from approximately 520 to 690. The location of the impacts of flooding is shown in Figure 3. Most of the impacts are within Irvine and Troon with flooding to people, non-residential properties, community facilities, utilities, roads and railways. History of flooding There are very few recorded floods within this area. River and surface water floods were reported in Barassie and Loans areas with limited impact to people and property. Coastal flooding took place at Titchfield Road in Troon in January 2014 resulting in short term road closures and the flooding of gardens. There have also been reports of coastal flooding in Troon in 1911, 1912, 1938 and 1936 which flooded seafront roads and shops. Ayrshire Local Plan District Section 2 98 1 in 10 1 in 200 1 in 1000 High likelihood Medium likelihood Low likelihood Residential properties (total 50 1,000 1,400 8,200) Non-residential properties (total <10 520 660 1,100) People 110 2,300 3,000 <10 Includes: <10 Includes: Community educational educational 0 facilities buildings and buildings and healthcare facilities healthcare facilities Utilities assets <10 20 30 Transport links - 1.3 (of which 0.3 is 4.8 (of which 0.6 is 6.7 (of which 0.7 is roads (km) A road) A road) A road) Transport links - 0.7 1.7 2.0 rail (km) Environmental designated areas 0.6 0.6 0.6 (km2) Designated cultural heritage 3 3 3 sites Agricultural land 2 0.9 1.2 1.7 (km ) 1 Table 1: Summary of flooding impacts Figure 2: Damages by flood likelihood 1 Some receptors are counted more than once if flooded from multiple sources 99 Section 2 Ayrshire Local Plan District Figure 3: Impacts of flooding Ayrshire Local Plan District Section 2 100 Objectives to manage flooding in Potentially Vulnerable Area 12/07 Objectives provide a common goal and shared ambition for managing floods. These objectives have been set by SEPA and agreed with flood risk management authorities following consultation. They were identified through an assessment of the underlying evidence of the causes and impacts of flooding. Target areas have been set to focus actions; they do not necessarily correspond to areas at risk in SEPA’s flood map. The objectives below have been set for Irvine to Troon Potentially Vulnerable Area. Reduce the risk of coastal and surface water flooding to non-residential properties in Troon Indicators: Target area: • 410 non-residential properties • £85,000 Annual Average Damages Image found and displayed. Objective ID: 12020 ©Crown copyright. All rights reserved. SEPA lic.no. 100016991 (2015) 101 Section 2 Ayrshire Local Plan District Target area Objective ID Indicators within PVA Irvine Reduce the economic damages and risk to 12042 * See note below people from surface water flooding in Irvine Applies across Avoid an overall increase in flood risk 12039 • 1,000 residential Ayrshire Local properties Plan District • £1.3 million Annual Average Damages Applies across Reduce overall flood risk 12082 • 1,000 residential Ayrshire Local properties Plan District • £1.3 million Annual Average Damages Applies across Organisations such as Scottish Water, Ayrshire Local energy companies and Historic Plan District Environment Scotland actively maintain and manage their own assets, including the risk of flooding. These actions are not detailed further in the Flood Risk Management Strategies. * This objective will be monitored using surface water flood risk across the Potentially Vulnerable Area. For 12/07 there are 40 residential properties at risk and Annual Average Damages of £68,000. Ayrshire Local Plan District Section 2 102 Actions to manage flooding in Potentially Vulnerable Area 12/07 Actions describe where and how flood risk will be managed. These actions have been set by SEPA and agreed with flood risk management authorities following consultation. Selection of actions to deliver the agreed objectives was based on a detailed assessment and comparison of economic, social and environmental criteria. The actions shaded and then described below have been selected as the most appropriate for Irvine to Troon Potentially Vulnerable Area. Selected actions Flood Natural flood New flood Community Property level Site protection protection management warning flood action protection plans scheme/works works groups scheme Flood Natural flood Maintain flood Awareness Surface water Emergency protection management warning raising plan/study plans/response study study Maintain flood Strategic Flood Planning Self help Maintenance protection mapping and forecasting policies scheme modelling Action (ID): NATURAL FLOOD MANAGEMENT WORKS (120200004) Objective (ID): Reduce the risk of coastal and surface water flooding to non- residential properties in Troon (12020) Delivery lead: South Ayrshire Council Status: Existing Indicative delivery: Ongoing Description: South Ayrshire Council are currently undertaking sand dune propagation in Troon,