Proposed Mixed Use Development Dalmarnock Road, Rutherglen
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Proposed Mixed Use Development Dalmarnock Road, Rutherglen Flood Risk Assessment February 2018 117623: Mixed Use Development, Rutherglen Flood Risk Assessment CONTROL SHEET CLIENT: Rubicon Land PROJECT TITLE: Proposed Mixed Use Development Dalmarnock Road, Rutherglen REPORT TITLE: Flood Risk Assessment PROJECT REFERENCE: 117623 DOCUMENT NUMBER: 117623/WS/01 STATUS: FINAL FINAL Name Signature Date Prepared by K M H Barr 02/02/18 Checked by V Ford 02/02/18 Approved by K M H Barr 02/02/18 Issue & Approval Schedule Schedule Issue & Approval Rev. Date Status Description Signature By KMHB Minor amendments and 1 6/02/18 FINAL Check VF issued as Final Report. Approve KMHB By Revision Record Revision Record 2 Check Approve This document has been prepared in accordance with procedure OP/P02 of the Fairhurst Quality and Environmental Management System This document has been prepared in accordance with the instructions of the client, Rubicon Land, for the client’s sole and specific use. Any other persons who use any information contained herein do so at their own risk. 117623: Mixed Use Development, Rutherglen Flood Risk Assessment CONTENTS 1 Introduction ................................................................................................................................. 1 2 Planning Policy ........................................................................................................................... 2 3 Development Proposals .............................................................................................................. 5 4 Potential Sources of Flood Risk.................................................................................................. 8 5 Flood Risk Analysis .................................................................................................................... 9 6 Conclusion ................................................................................................................................ 13 7 References ................................................................................................................................ 14 Appendix A - Drawings 117623: Mixed Use Development, Rutherglen Flood Risk Assessment 1 Introduction Fairhurst was appointed by Rubicon Land to assess the potential flood risk associated with a proposed mixed use development at Dalmarnock Road, Rutherglen. The proposed development site is located within the existing retail park to the west of Dalmarnock Road, approximately 400m north-west of Farme Cross. The site location is shown on Figure 1, below. Site location Figure 1: Location plan A Level 2 flood risk assessment has been carried out in line with guidance contained in the CIRIA document C624 - Development and Flood Risk – Guidance for the Construction Industry, 2004 . This includes identification of any existing flooding information for the area, both historic and modelled. The River Clyde flows from east to west about 20m north of the site. This report addresses potential flood risk associated with the River Clyde. Other sources of flood risk have also been considered. 1 117623: Mixed Use Development, Rutherglen Flood Risk Assessment 2 Planning Policy 2.1 National planning policy In consideration of planning applications, planning authorities require to be satisfied that due account has been taken of Scottish Planning Policy (SPP). It is necessary to show that adequate protection against flooding exists or can be provided for a proposed development and that the development does not increase any existing flood risk to persons or property upstream and downstream. The flood risk framework guiding development sets out three categories of coastal and watercourse flood risk, together with guidance on surface water flooding, and the appropriate planning approach for each (the annual probabilities referred to in the framework relate to the land at the time a plan is being prepared or a planning application is made): • Little or No Risk - annual probability of coastal or watercourse flooding is less than 0.1% (1:1000 years) o No constraints due to coastal or watercourse flooding. • Low to Medium Risk - annual probability of coastal or watercourse flooding is between 0.1% and 0.5% (1:1000 to 1:200 years) o Suitable for most development. A flood risk assessment may be required at the upper end of the probability range (i.e. close to 0.5%), and for essential infrastructure and the most vulnerable uses. Water resistant materials and construction may be required. o Generally not suitable for civil infrastructure. Where civil infrastructure must be located in these areas or is being substantially extended, it should be designed to be capable of remaining operational and accessible during extreme flood events. • Medium to High Risk - annual probability of coastal or watercourse flooding is greater than 0.5% (1:200 years) o May be suitable for: residential, institutional, commercial and industrial development within built-up areas provided flood protection measures to the appropriate standard already exist and are maintained, are under construction, or are a planned measure in a current flood risk management plan; essential infrastructure within built-up areas, designed and constructed to remain operational during floods and not impede water flow; some recreational, sport, amenity and nature conservation uses, provided appropriate evacuation procedures are in place; and job-related accommodation, e.g. for caretakers or operational staff. o Generally not suitable for: civil infrastructure and the most vulnerable uses; 2 117623: Mixed Use Development, Rutherglen Flood Risk Assessment additional development in undeveloped and sparsely developed areas, unless a location is essential for operational reasons, e.g. for navigation and water-based recreation, agriculture, transport or utilities infrastructure (which should be designed and constructed to be operational during floods and not impede water flow), and an alternative, lower risk location is not available; and new caravan and camping sites. o Where built development is permitted, measures to protect against or manage flood risk will be required and any loss of flood storage capacity mitigated to achieve a neutral or better outcome. o Water-resistant materials and construction should be used where appropriate. Elevated buildings on structures such as stilts are unlikely to be acceptable. Surface Water Flooding - Infrastructure and buildings should generally be designed to be free from surface water flooding in rainfall events where the annual probability of occurrence is greater than 0.5% (1:200 years). - Surface water drainage measures should have a neutral or better effect on the risk of flooding both on and off the site, taking account of rain falling on the site and run-off from adjacent areas. SPP states that new development should not take place if it would be at significant risk of flooding from any source or would materially increase the probability of flooding elsewhere. In general, the storage capacity of floodplains should be safeguarded and works to elevate the level of the site by landraising should not lead to a loss of floodwater storage capacity. The Scottish Environment Protection Agency (SEPA) has a duty to give advice to planning authorities as to flood risk under the Flood Risk Management Act 2009, Section 72. SEPA considers this to include professional and expert interpretation of data or records. The Secretary of State for Scotland’s guidance requires SEPA to take a holistic approach to the protection and enhancement of the environment. Planning authorities must consider SEPA’s views on the merits of any proposals involving carrying out works or operations in the bed or on the banks of rivers and streams. The SEPA/Planning Authority Protocol on Development at Risk of Flooding Advice and Consultation issued in 2011 provides principles to be followed by authorities regarding advice and consultation on flood risk issues. It also gives generic guidance on the requirements for undertaking flood risk assessments. 2.2 Local planning policy The South Lanarkshire Local Development Plan (LDP) was adopted on 29 June 2015. The LDP and its associated supplementary guidance are material considerations when determining planning applications. Policy 17 - Water Environment and Flooding of the LDP states: 3 117623: Mixed Use Development, Rutherglen Flood Risk Assessment Any development proposals which will have a significant adverse impact on the water environment will not be permitted. This includes engineering works such as culverting. In determining proposals consideration shall be given to water levels, flows, quality, features, flood risk and biodiversity within the water environment. The use of buffer and no development zones will be introduced to protect the riparian zone. The avoidance principle of flood risk management as set out in SPP must be met. Within areas identified as functional floodplain the Council will not support any development proposals except where a specific location is essential for operational reasons and appropriate mitigation measures can be taken that meet the principles of flood risk management. Sites where flood risk may be an issue (due to the breeching of watercourses, surface water and run off and impact of the proposal on groundwater) shall be the subject of a local flood risk management assessment. Any development where the flood risk cannot be appropriately managed to prevent a significant adverse increase in the risk of flooding