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11 Effects on Hydrology

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11 Effects on Hydrology 11 Effects on Hydrology Introduction & Methodology Background 11.1 This chapter examines the potential impacts on hydrology for a proposed junction between the M8 Motorway and the A8 road near Bishopton, Renfrewshire. The proposed junction is designated M8 Jn29A. 11.2 A hydrological assessment of potential impacts of the road improvement including possible mitigation measures is now required as part of an Environmental Statement. Methodology and Significance Criteria General Scope of Assessment 11.3 The Scope of the Hydrological Assessment falls into a number of general categories that are incorporated into the overall Assessment Methodology; • Desktop review of available background data, available maps and published information as well as consultation with relevant statutory and non-statutory bodies. • Site walkover including establishment of local hydrology and water supplies as well as conducting interviews with local stakeholders. • Analysis of existing hydrology and establishment of Baseline Condition and its sensitivity. • Analysis of proposed road impact (likelihood and significance) on the local hydrology and the establishment of a risk matrix to guide potential mitigation measures. • Identification of measures to avoid and mitigate evaluated potential effects; • Reporting and summary of Construction Mitigation and Residual Effects. 11.4 Additional details of these elements are provided in the sections below. Relevant Guidance 11.5 The Planning context is set out in Chapter 5 of this statement. The hydrology assessment has been undertaken in line with the following regulations, policies and guidance: • Water Framework Directive (2000/60/EC)30. The Water Framework Directive (WFD) establishes a framework for the protection, improvement and sustainable use of all water environments; • The Environmental Impact Assessment (Scotland) Regulations 1999 – Part II (with amendments) • Scottish Environment Protection Agency, Policy No 41. • The Construction Industry Research and Information Association (CIRIA) C624 (2004) – ‘Development and Flood Risk – guidance for the construction industry’. • CIRIA C650 (2005) – ‘Environmental Good Practice on Site’. • CIRIA C532 (2001) – ‘Control of Water Pollution from Construction Sites’. 30 European Parliament (2000). “Directive 2000/60/EC of the European Parliament and of the Council establishing a framework for the Community action in the field of water policy” (“The Water Framework Directive”). 149 715/M8 MOTORWAY & GREENOCK ROAD (A8), INCHINNAN CASS ASSOCIATES ROYAL ORDNANCE, BISHOPTON MARCH 2015 • CIRIA C697 (2007) SUDS Manual • Scottish Planning Policy (SPP) (February 2010) – Scottish Government policy on nationally important land use planning matters. • PPG1 ‘General guide to the prevention of water pollution’ • PPG5 ‘Works in, near or liable to affect watercourses’ • PPG6 – Working at construction and demolition sites • PPG7 – Refuelling facilities Assessment Area 11.6 This assessment only addresses the effects of the proposed new M8Jn29A road junction near Bishopton as detailed elsewhere in the Environmental Statement. The description of the hydrological baseline considers the area at the proposed junction together with the land in the immediate vicinity including that of the local residents. Consultations & Background Information 11.7 Information has been provided by a range of organisations and individuals during the assessment as summarised in the table below. Table 11.1: Consultations Consultee Notes Telephone discussions with area staff. Awaiting response to SEPA written enquiry. Information obtained on meteorological conditions and regional The Meteorological Office climate averages. Discussions were held with a key land owner whose land is directly affected by the proposed junction in November 2012. Local Residents Details of these interviews are discussed and addressed within the assessment. 11.8 Additional information was provided by previously issued land assessments including; • Terrenus Consulting - Site Investigation Report – issued October 2006 • Dougall Baillie Associates - Flood Risk and Surface Water Drainage Impact Assessment Report (Rev A) – issued August 2006 • BAE Systems Environmental – Environmental Statement – issued October 2012 11.9 Proposed Sustainable Drainage System design layout details relating to the current junction development proposal were provided by Dougall Baillie Associates. Desk Study 11.10 The desk study collated existing data to form an understanding of the hydrology and hydrogeology of the area. 150 715/M8 MOTORWAY & GREENOCK ROAD (A8), INCHINNAN CASS ASSOCIATES ROYAL ORDNANCE, BISHOPTON MARCH 2015 11.11 The desk study included: • An overview of the local catchment including watercourses, drainage patterns and water features; • Collation of data provided through consultations, and • Compilation of soils, geological and hydrogeological information 11.12 Reference was made to the following sources of information: • The British Geological Survey (BGS) Digital Mapping • Hydrogeological Map of Scotland, 1988. British Geological Survey • Groundwater Vulnerability Map of Scotland, 1995. British Geological Survey • Publically available Ordnance Survey (OS) sheets • Topographic survey supplied by Dougall Baillie Associates Site Walkover 11.13 A site walkover was carried out on 20th November 2012 to inspect surface water features, obtain an understanding of the local topography and hydrological regime, and to interview a number of local residents. Significance Criteria 11.14 The following criterion is used throughout this assessment: The significance of the potential effects of the proposed road junction are classified by taking into account the sensitivity of receptors and the magnitude of the potential effect, combined with the likelihood of an event occurring. 11.15 The Town and Country Planning (Environmental Impact Assessment) (Scotland) Regulations requires a description of: (a) The magnitude and complexity of the impact (b) The probability of the impact (c) The duration, frequency and reversibility of the impact. 11.16 The assessment is based on a ‘significance matrix assessment approach’ which in turn is based on the characteristics of the impact (magnitude and nature) and the sensitivity of the receptor. This relies on the importance attached to the receptor (or indicator) in local, regional and national economic development and regeneration policy in the study team’s professional judgement. 11.17 The EIA assessment method presented herein for impacts not relating to contamination is based on impact assessment guidance which can be found in: 11.18 Design Manual for Roads and Bridges, Volume 11 Environmental Assessment, Section 2, Part 5, HA205/08 Assessment And Management Of Environmental Effects (Highways Agency et al, 2008). 11.19 DMRB guidance information relevant to the Hydrogeology / Water Environment is found in the following related documents. 11.20 Design Manual for Roads and Bridges, Volume 11 Environmental Assessment, Section 3, Part 11, Geology and Soils (Highways Agency et al, 1993). 151 715/M8 MOTORWAY & GREENOCK ROAD (A8), INCHINNAN CASS ASSOCIATES ROYAL ORDNANCE, BISHOPTON MARCH 2015 11.21 Design Manual for Roads and Bridges, Volume 11 Environmental Assessment, Section 3, Part 10, HD 45/09 Road Drainage and the Water Environment (Highways Agency et al, 2008). 11.22 The EIA Regulations require consideration of a variety of types of effect, namely: • Direct/indirect • Secondary • Cumulative • Positive/negative • Short/medium/long-term; and • Permanent/temporary. 11.23 In this ES, effects are considered in terms of how they arise, whether they are positive or negative, and their duration. Each will have a source originating from the development, a pathway and a receptor. Table 11.2 defines the relative terms used in describing the nature of effects. Table11.2: Definitions of the terms used in describing the nature of effects Effect Description Direct Effects arising on-site Indirect Effects arising off-site due to the proposed development. Temporary Effects which cause a change to the baseline for a limited period of time. Permanent Effects causing an irreversible change to the baseline. Short-term Impact is measurable over seconds up to 3 months’ time Medium-term Impact is measurable over 4 months to 2 years’ time Long-term Impact is measurable greater than 3 years Effects which arise from multiple types of effect on a particular receptor. Cumulative These may overlap spatially or temporally. 11.24 The assessment of the potentially significant environmental effects has been based on a set of sensitivity criteria. For the purpose of this assessment sensitivity is determined as Very High, High, Medium, Low and Negligible. 11.25 Examples of how sensitivity may be determined for a particular feature are provided for transparency. The example hydrogeological criteria have been taken from guidance (DMRB, Volume 11 Environmental Assessment, Section 3, Part 10, HD 45/09 Road Drainage and the Water Environment, Highways Agency, 2009). Other receptors’ sensitivities have been produced for receptors where no descriptive examples are provided in the DMRB guidance. 152 715/M8 MOTORWAY & GREENOCK ROAD (A8), INCHINNAN CASS ASSOCIATES ROYAL ORDNANCE, BISHOPTON MARCH 2015 Unmitigated Development Sensitivity 11.26 Sensitivity is also dependent on factors such as the quality of local receiving waters and their existing purpose and influences. In this instance the local surface receiving waters comprise drainage channels that discharge into
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