River Mersey Warrington FRMS Phase 3B Latchford East (Westy) Environmental Report September 2015
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Quality Assurance
Project name Mersey Warrington FRMS
Project 1B1S IMNW000699 reference
Date September 2015
Version number V2.4
Author Various
EIA Quality Mark
This Environmental Report was undertaken in line with the EIA Quality Mark Commitments.
The EIA Quality Mark is a voluntary scheme, operated by the Institute of Environmental Management and Assessment (IEMA), through which EIA activity is independently reviewed, on an annual basis, to ensure it delivers excellence in the following areas:
EIA Management EIA Team Capabilities EIA Regulatory Compliance EIA Context & Influence EIA Content EIA Presentation Improving EIA practice
To find out more about the EIA Quality Mark please visit: www.iema.net/qmark
EXECUTIVE SUMMARY
This Environmental Report considers the potential environmental effects of the construction of a flood defence scheme by Environment Agency on land at Westy, Warrington.
The scheme consists of a sheet piled wall tying in to high ground at both ends which is designed to provide a 1 in 100 year Standard of Protection (SoP) to the Westy area. This scheme is Phase 3B of the Mersey Warrington Flood Risk Management Scheme which will provide a 1 in 100 year SoP for Warrington as a whole.
The flood defence will be constructed in three sections, ML1, ML2 and ML3 (ML referring to Mersey Left bank) which will form a single continuous barrier around the urban area, as shown at Figure 1.2. ML1 starts at Westy Park and runs along Mersey Walk. The sheet piles will be clad in a decorative concrete facing, similar to that used elsewhere in the Warrington scheme. ML2 runs across Westy Point, north of the Cardinal Newman Catholic High School. The sheet piles will be finished with a timber coping. ML3 runs from Westy Point south to near Kingsway Bridge. The sheet piles will be concealed within an earth embankment.
The scheme will cause temporary construction effects including loss of trees; disturbance to residents and students from construction activity and noise; and disruption to traffic flows. Some footpaths will have to be temporarily closed and fishing quality may be temporarily reduced. No adverse effects on the ecology of the site will occur, though there may be temporary disturbance to mammals, for which a protected species licence will be obtained. No adverse effects on cultural heritage are anticipated.
Mitigation measures are proposed, where practicable, and these will be incorporated into the Environmental Action Plan. Most mitigation is aimed at avoiding or reducing the effects of construction activities and is therefore short term. Mitigation for landscape effects (e.g. planting of new trees) will take some years to take full effect. The EA and its appointed construction contractor will use their best endeavours to maintain liaison with all affected parties during the construction period.
The scheme, once constructed, will bring a considerable benefit to Warrington and the residents of Westy in particular, by providing greater protection from the adverse effects of flooding.
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CONTENTS
1.0 BACKGROUND 1
1.1 Introduction 1 1.2 Legislative Framework 1 1.3 Background to the Proposal 1 1.4 The Problem 2 1.5 Description of the Site 3 1.6 Options Considered 4 1.7 Consultation 5 1.8 Description of the Permanent Works 8 1.9 Description of Advance Works 9 1.10 Description of the Temporary Works 9 1.11 Operation & Maintenance 11 1.12 Duration of the works 11 1.13 Programme and Construction Sequence 12 1.14 Baseline Data 12 1.15 Scoping methodology 12
2.0 ECOLOGY 13
2.1 Existing Environment 13 2.2 Likely Effects 20 2.3 Conclusion 27
3.0 CULTURAL HERITAGE 28
3.1 Introduction 28 3.2 Existing Environment 28 3.3 Likely Effects 30 3.4 Mitigation 30 3.5 Residual Effects 31
4.0 PUBLIC RECREATION & ACCESS 32
4.1 Existing Environment 32 4.2 Likely Effects 34 4.3 Mitigation 35 4.4 Residual Effects 36
5.0 LANDSCAPE & VISUAL AMENITY 37
5.1 Introduction 37 5.2 Planning Context 37 5.3 Landscape Character 37
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5.4 Environmental Outcomes 40
6.0 TRAFFIC & TRANSPORTATION 41
6.1 Introduction 41 6.2 Existing Environment 41 6.3 Likely Effects 42 6.4 Mitigation 43 6.5 Residual Effects 43
7.0 NOISE, DUST & VIBRATION 44
7.1 Introduction 44 7.2 Existing Environment 44 7.3 Baseline Noise Measurements 45 7.4 Likely Effects 46 7.5 Mitigation 48 7.6 Residual Effects 49
8.0 WATER ENVIRONMENT 50
8.1 Introduction 50 8.2 Existing environment 51 8.3 Likely effects 52 8.4 Mitigation 53 8.5 Residual effects 53
9.0 CUMULATIVE EFFECTS 54
9.1 Existing environment 54 9.2 Likely effects 54 9.3 Mitigation 54 9.4 Residual effect 54
10.0 SUMMARY & CONCLUSION 55
10.1 Existing environment 55 10.2 Likely effects 55 10.3 Mitigation 56 10.4 Environmental Action Plan 57 10.5 Residual effects 57 10.6 Conclusion 57
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FIGURES
Figure 1.1 Site Location
Figure 1.2 General Arrangement
Figure 4.1 Public Rights of Way
Figure 5.1 ML1 Landscape Reinstatement
Figure 5.2 ML2 Landscape Reinstatement
Figure 5.3 ML3 Landscape Reinstatement
APPENDICES
Appendix 2.1 Ecological Appraisal
Appendix 2.2 Record Enquiry Service Report
Appendix 2.3 Confidential Report (restricted issue)
Appendix 2.4 GCN Analysis
Appendix 3.1 Project Design for an Archaeological Mitigation on Phase 3 of the Warrington Flood Risk Management Scheme
Appendix 5.1 Landscape and Visual Amenity
Appendix 6.1 Likely Transport Impacts
Appendix 6.2 Forecast of Traffic Impact Levels
Appendix 6.3 Mitigation Measures
Appendix 7.1 Noise Methodology and Assessment
Appendix 7.2 Noise Survey Data
Appendix 8.1 Water Framework Directive Assessment B1464700/WFD2, Jacobs
Appendix 10.1 Environmental Action Plan
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1.0 BACKGROUND
1.1 Introduction
1.1.1 This Environmental Report (ER) has been prepared in support of the planning application for the proposed flood defences to be carried out by Environment Agency (EA) on land at Westy, Warrington. The ER describes the proposed works, the baseline conditions and considers the likely environmental impacts, together with any proposed mitigation. Its purpose is to:
inform interested parties of EA’s approach; identify potential environmental impacts and how they may be mitigated; address issues raised during consultations; and identify potential environmental improvements.
1.2 Legislative Framework
1.2.1 The scheme requires planning consent from Warrington Borough Council (WBC). Prior to preparation of this ER, EA submitted a screening opinion request to WBC in accordance with the Town and Country Planning (Environmental Impact Assessment) Regulations 2011 (SI 1824).
1.2.2 The request was accompanied by an ER presenting all environmental data available at that time and providing an assessment of the likely environmental impacts. Although some environmental investigations were still being carried out, there were no significant knowledge gaps. On 26 August 2015, WBC issued a formal opinion that EIA would not be required.
1.2.3 The ER for the screening opinion request has been updated with information and assessment derived from the further environmental investigations carried out over summer 2015. Nothing found since submission of the original screening opinion request and ER suggest that the conclusions reached that EIA would not be required should be revised.
1.3 Background to the Proposal
1.3.1 The EA proposes to construct a comprehensive scheme of flood defences in the Westy area of Warrington. These defences will be delivered as part of a wider scheme to protect the whole of Warrington. The aim of this scheme is
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to provide a 1in100 year Standard of Protection (SoP) to residential and other premises in the Westy area.
1.3.2 The Westy flood defences were originally excluded from the EA’s flood risk management scheme for Warrington, because it was assumed that these defences would be constructed as part of a consented development by United Utilities/ WBC to provide housing at Cardinal Newman High School and recreational facilities at Westy Point. It subsequently transpired that there is no realistic prospect of this consented development (planning permission refs. 2003/01905; 2007/12025; & 2010/17569) being constructed in the foreseeable future so the EA has decided to deliver the scheme in order to provide Westy with the same level of flood protection as other areas of Warrington.
1.4 The Problem
1.4.1 Warrington is at risk of flooding from both the sea (tidal) and river (fluvial) events. Prior to the construction of the wider flood defence scheme, the EA flood risk maps for Warrington identified approximately 4,000 properties as being at a 1 in 100 year risk of flooding (i.e. a 1% chance of flooding in any one year). Over half of these properties are located within the ‘M2 Woolston to Lower Walton’ flood cell, the area of focus for the Mersey Warrington FRMS. In 2009, the National Flood Risk Assessment showed that Warrington had the 10th highest number of properties at significant risk of flooding in the country.
1.4.2 In February 1990 a high tide flooded the Lower Walton, Knutsford Road and Westy areas. Further flooding occurred in 1998 and localised flooding of roads and low-lying areas in tidal reaches were recorded during October/November 2000, with high tides in February 2002 and March 2006 also coming close to flooding the Knutsford Road area. Typically, the River Mersey will overtop its banks every year at the highest annual tides.
1.4.3 Until the operation of the Manchester Ship Canal (MSC), Warrington also experienced frequent fluvial flooding. The MSC effectively works as a by- pass channel conveying fluvial flows along the MSC and away from the main centres of population within Warrington. However, when flows exceed the MSC’s capacity at Latchford Locks, water backs up and flows into the River Mersey at Bollin Point. This gives rise to increased risk of flooding along the River Mersey.
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1.4.4 The existing flood defences within Warrington offered varying standards of protection and were estimated as providing up to a 1 in 20 year standard (representing a 5% chance of flooding in any one year).
1.4.5 EA’s strategy for flood defence in the Warrington area is to ‘deliver a comprehensive scheme to manage the risk to people, property and the environment from flooding over the next 100 years’ (Mersey Warrington FRMS). This has been delivered across a phased scheme consisting of:
Phase 1 on the south side of the River Mersey, completed in November 2013 and now providing an improved standard of flood protection to 1500 properties in Latchford; Phase 2, between Howley Lane and Wharf Street, and Phase 2A, at Scottish Power Sub-station, were completed in December 2014; Phase 3 has been split into three phases: o Phase 3A, between Kingsway Bridge and Paddington Bank including The Twiggeries and Cinnamon Brow – currently under construction; o Phase 3B, Woolston and Westy which would be implemented between April 2016 and March 2017; This ER covers the proposed scheme for Westy. A separate ES Addendum and planning application will be prepared for the two sites in Woolston – this is not referred to further in this submission; A further phase (3C) is being considered at Orford Road in Padgate. This will be subject to separate consenting procedures.
1.5 Description of the Site
1.5.1 The site is shown on Figure 1.1. It extends for a distance of approx 850m and includes part of Westy Park at the upstream end, Mersey Walk, overgrown land north and west of the Westy pumping station/ Cardinal Newman High School and Bridge Avenue adjacent to Kingsway Bridge.
1.5.2 At the upstream end of the site, Westy Park comprises an area of mown grassland crossed by informal footpaths and this extends along Mersey Walk where there are a number of mature poplar trees.
1.5.3 Across Westy Point, the site includes the former sewage works. The open land has become heavily colonised with young hybrid willow/ poplar/
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sycamore/ oak scrub. There are a number of areas of existing hardstanding and hard surfaced tracks within the site. To the south, The Cardinal Newman Catholic High School and a pumping station are both security-fenced. The site is bounded on its other sides by the River Mersey.
1.5.4 Informal public access is possible around Westy Point and several tracks are in evidence providing access to fishing pegs on the Mersey.
1.5.5 A disused channel, The Feeder, runs down the west side of the site. It formerly supplied water to the Runcorn & Latchford Canal (disused) but no longer holds water in normal conditions. It terminates near the A50 Kingsway South with no connection to the canal. A low earth embankment runs along the eastern side of The Feeder.
1.6 Options Considered
1.6.1 The consented WBC/ UU scheme did not provide sufficient detail for EA to construct the flood defence scheme as it stood. In addition, further detailed modelling by EA had suggested that the flood defence needed extending further along Mersey Walk to deliver the 1:100 SoP. EA therefore revised the consented scheme and in doing so took into account the considerations below.
1.6.2 The total length of flood defence has been divided into three sections, ML1 (Mersey Walk), ML2 (Westy Point) and ML3 (The Feeder). A consideration of options is presented below; descriptions of each section are given in s1.8:
ML1: a flood embankment would not be sufficiently resilient in the long term at this location; in addition, a seepage cut-off was required. The only option therefore was a sheet piled wall; ML2: several different solutions were considered, including rebuilding the high school boundary as a flood defence wall, running an earth embankment across land to the north and land raising north of the school. All these options encountered difficulties in ensuring vehicular access for the future WBC/ UU development. EA therefore adopted the use of a sheet pile wall whose narrow footprint avoids these difficulties. ML3: The future WBC/ UU development left a very narrow strip available for flood defence works, severely limiting options. A seepage cut-off was also required on this section of the flood defence, leaving sheet piling as the only viable option. Options were considered for the treatment of the
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piles before deciding to conceal them within a steep sided vegetated bund.
1.7 Consultation
1.7.1 Throughout the development of the scheme, EA has maintained a dialogue with WBC and other interested parties. Meetings and discussions have also been held with:
Cardinal Newman Catholic High School; United Utilities; Warrington Anglers Association; Westy Community Centre; Peel Developments Ltd; Wirral & Cheshire Badger Group; and A public consultation event was held.
1.7.2 Consultation with WBC, via the issue of the screening opinion request and in other discussions and meetings, has not elicited any significant concerns about the proposed development.
1.7.3 Comments received from WBC in respect of the screening opinion request were:
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Topic Consultee Comments
Ecology Not EIA development on the grounds of Ecology; no sites designated by statute will be directly affected by the works and no significant populations of protected species will be affected. However the site(s) is ecologically sensitive on a District scale and so appropriate ecology surveys and assessments must be carried out and mitigation proposed if required. Supply ecological reports. Landscape & Visual Amenity None Cultural Heritage No concerns, but commented that “It would...be helpful if the procedure for calling out an archaeological contractor was formalised in the construction management plan so that all parties are aware of the procedure. This will allow the prompt recording of any remains in the event that anything significant is uncovered.” Land Use and Recreation None Traffic and Transport Prepare Construction Environmental Management Plan (CEMP) Water Environment None Contaminated Land Prepare CEMP. Supply contamination reports. Noise, Dust & Vibration Prepare CEMP Cumulative Impacts None
1.7.4 The issues raised by the screening opinion consultees have been addressed as follows:
Ecology: additional protected species surveys are being carried out and if necessary, protected species Licence(s) will be applied for. The landscape reinstatement scheme seeks to enhance biodiversity; Cultural Heritage: EA has commissioned an Archaeological Project Design which takes account of the comments received; Traffic & Transport: a CEMP will be prepared by the appointed construction contractor; Contaminated Land: a CEMP will be prepared by the appointed construction contractor;
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Noise, Dust & Vibration: a CEMP will be prepared by the appointed construction contractor.
1.7.5 Issues raised by other consultees during consultations between 2013 – 2015 with the EA response are listed below:
Consultee Comments and EA Response Natural England Discussion regarding survey methodologies and licencing in respect of protected species. Agreement reached. United Utilities Discussion in respect of potential construction options and flood defence alignment informed the final preferred option. WBC Estates Discussions in respect of access required by future mixed use development at Westy: provision made for future access in ML2 alignment. WBC Highways Alignments of reinstated footpaths agreed. United Utilities/ WBC Estates Discussion in respect of design detailing of walls: agreement reached. Public consultation Request from Mersey Walk residents for all trees to be felled (health & safety risk): agreed, with mitigation planting of more suitable species. EA - Fisheries Overall the report conclusions are acceptable, but noise impacts on fish and potential impacts on fisheries should be refined. Comments incorporated into the ER. EA – Cultural Heritage No comments EA - Landscape Commented on potential for planting larger sized tree stock and suggested omit Rubus tricolor. Design amended. Also gave advice re assessment methodology. EA - Geomorphology No comments EA - Biodiversity No comments
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1.8 Description of the Permanent Works
1.8.1 The proposed permanent works consist of 880m of a new flood defence wall. Its general arrangement is shown on Figure 1.2 and each section described in more detail below.
ML1
1.8.2 ML1 would start in Westy Park at a point approximately 15m east of Mersey Walk and continue downstream for approximately 370m along the river side of Mersey Walk. A short section of embankment would tie the wall into existing high ground within Westy Park. The sheet piled wall would be clad both sides with a decorative pre-cast concrete cladding. For most of its length no railings would be fitted.
1.8.3 Just west of the junction of Mersey Walk and Mort Avenue the alignment would be set back from the pavement for some 35m to avoid an underground gas service. It would then continue west until near the junction of Mersey Walk with Davenport Avenue where a pedestrian ramp would be installed to retain access to the riverbank. The ramp would be fitted with decorative railings, similar to those used at Victoria Park, to prevent falls when crossing the wall.
1.8.4 The wall would continue west until its junction with wall ML2 near Westy Pumping Station. A ramp is proposed on land on the riverbank immediately adjacent to Mersey Walk to allow UU vehicles maintenance access over the flood wall. This ramp would be fitted with railings and a gate to prevent unauthorised vehicular access.
ML2
1.8.5 At Westy Pumping Station the flood defence continues as a wall running south west across the neck of Westy Point for approximately 240m. The alignment passes to the north of the high school. The sheet piled wall would be fitted with a timber coping similar to that used at Kingsway North allotments.
1.8.6 Approximately half way along ML2 the wall will have a kink to allow construction at a future date of a maintenance access ramp, if the landowner requires one (not included in this planning application). A number of small
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earth ramps will be placed at intervals along ML2 wall to allow the passage of wildlife.
1.8.7 Once past the school the flood defence turns south as ML3.
ML3
1.8.8 ML3 would turn south to follow the landward side of The Feeder, before terminating off Bridge Avenue. ML3 would be set back approximately 5m from the landward edge of The Feeder and would be concealed within an earth mound (both sides) with a 1m wide flat crest. An additional small length of earth bund, approx. 5m long, would be created to terminate and conceal the end of the sheet piles and to tie in to higher ground at Bridge Avenue.
1.8.9 The defence would tie in to higher ground at both ends, with the height gradually rising to approximately 1.8m above adjacent ground levels as the local topography falls away across Westy Point and then rises again.
1.8.10 Where affected by the works, existing security fencing at the high school and around land off Bridge Avenue would be reinstated at completion.
1.9 Description of Advance Works
1.9.1 The best time for constructing flood defences is between spring and late autumn, when risk of flooding and adverse weather is lowest and soils are likely to be in a workable condition. EA hopes that its contractor will make a start on the construction works in April 2016. Therefore any trees and vegetation which could provide a suitable nesting site for breeding birds must be removed before then. These advance works are programmed to be complete by the end of February 2016.
1.9.2 Surplus soils from Phases 2 and 3A may be available for the earth mounding along the sheet piles at ML3. If available these will be stockpiled in advance of the works on WBC land adjacent to Bridge Avenue.
1.10 Description of the Temporary Works
Compounds
1.10.1 The main Contractor compound would be located at the eastern end of the works on recreational land adjacent to Westy Community Centre, accessed off Bridgewater Avenue.
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1.10.2 The compound would be security fenced and gated and kept locked out of hours. The existing turf and topsoil would be removed and stored nearby, with a temporary surface or roadstone laid over a geotextile membrane. The compound would contain temporary site cabins with welfare, storage, office and meeting facilities.
1.10.3 A smaller satellite compound would be established at the western end of the works, located on open land off Bridge Avenue, with similar security and facilities to the main compound.
1.10.4 The contractor’s working area would be securely fenced off to prevent access by members of the public and wildlife during construction. All temporary fencing would be removed at completion.
1.10.5 All parking for site staff, visitors, plant and equipment will be accommodated within the site compounds; no parking will be permitted on adjacent residential roads.
Soil Stripping & Storage
1.10.6 A corridor of approximately 2m width would be stripped along the proposed route of the flood defence down to a depth of approximately 300mm to allow piling. There are a number of areas of existing concrete track/ hardstanding that will be made use of for access routes where possible. Where no such features exist, a temporary haul road 5m wide will be created by stripping topsoil and spreading a layer of roadstone over a geotextile. The topsoil will be stored separately from sub-soil and be used for landscape reinstatement. All temporary haul roads will be removed at completion and the existing soil profile reinstated.
1.10.7 A strip foundation would be excavated along both sides of ML1 wall to support the pre-cast concrete cladding. The subsoil released will be stored separately from stored top soil and will be used in creation of the earth bunds on ML3.
1.10.8 A temporary soil storage area would be provided behind properties at the western end of Bridgewater Avenue (see Figure 2). Topsoil and subsoil will be stored separately. All site-won soil will be re-used within the scheme during construction of the earth bunds and landscape reinstatement works and no export is anticipated.
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1.10.9 Additional soil, in excess of that released by the construction of the walls, will be required for construction of the earth embankment at ML3 and various ramps elsewhere. It is anticipated that this soil will be sourced from surplus materials released from preceding flood defence works at The Twiggeries. This soil will be temporarily stored in land off Bridge Avenue. Should sufficient material not be available from earlier phases, the shortfall will be imported from a local source.
Fencing
1.10.10 Where affected by the works, existing security fencing to the high school and land off Bridge Avenue will be temporarily re-located for the duration of the works to ensure continued protection. Temporary access arrangements for maintenance vehicles will be agreed with the landowner.
Materials
1.10.11 It is anticipated that some 2000m3 subsoil and 1800m3 roadstone will need to be imported to the site. The subsoil will be used to complete construction of the earth bunds (see s10.9). The roadstone will be removed from the site at completion.
1.10.12 Other materials that will need to be imported to the site include steel sheet piles, pre-cast concrete cladding and coping, timber coping and mild steel railings and gates.
1.11 Operation & Maintenance
1.11.1 Once installed there will be little requirement for maintenance; however EA will carry out periodic routine visual inspections of its flood defence assets by walking the alignment. EA will also inspect the defences following a flood event and carry out any maintenance/repairs that are required. Sheet piles are inherently very strong and the requirement for maintenance is anticipated to be extremely low.
1.12 Duration of the works
1.12.1 It is estimated that the main construction period would last for approximately 30 weeks starting in April 2016, excluding advance works and landscape reinstatement which may extend into winter 2016/ 2017.
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1.13 Programme and Construction Sequence
1.13.1 The indicative construction sequence will be:
Advance vegetation clearance; Set up site compounds and secure the site; Site clearance, stripping and storage of topsoil; Laying of piling mats and driving of sheet piles; Excavation of foundation trenches for cladding (ML1 wall); Installation of cladding and copings; Creation of vehicular and pedestrian ramps; Railings/ fencing; Creation of earth bunds (ML3, tie-ins at both ends of the flood defence and ML2 wildlife ramp); Landscape reinstatement works.
1.14 Baseline Data
1.14.1 The baseline data presented in this ER has been collated from survey work/ investigations carried out between 2010 - 2015, supplemented by review of the magic.gov.uk and nbn.org.uk websites, site visits and continuing survey effort.
1.15 Scoping methodology
1.15.1 The EIA screening opinion issued by WBC did not note any environmental issues other than those already identified by EA in its screening opinion request report. The issues reported on in the earlier report have therefore been carried though into this Environmental Report.
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2.0 ECOLOGY
2.1 Existing Environment
Study Area
2.1.1 The ecological study area was based on the indicative working area plan. A description can be found in Chapter 1: Background, supported by the methodology described in the ecological report (Appendix 2.1).
General Description
2.1.2 A general description of the site is provided at Chapter 1. The site is characterised by a mosaic of primarily secondary and typical riverine habitats which have colonised the site from post-industrial use as a wastewater treatment works.
Catchment Context
2.1.3 The study area lies within the Urban Mersey Basin Natural Area. The development of the natural area concept is a key part of Natural England’s strategy for conserving nature. A Natural Area is not a formal designation, but a part of England which is characterised by a unique combination of physical features.
2.1.4 The River Mersey is a waterbody of the Mersey Estuary classified in the North West River Basin Management Plan (RBMP)1. The RBMP outlines key actions for improving the ecological status of this water body, and those of potential relevance to the proposed Flood Risk Management Scheme in Warrington are:
Supporting and funding River Mersey Fry refuge project for creating suitable juvenile habitat in downstream reaches of modified rivers; and Improving habitat in downstream reaches of modified rivers.
2.1.5 A Water Framework Directive assessment was prepared in 2011 and submitted with the original planning application for the Mersey Flood Risk Management Scheme. This has been reviewed as part of the preparation of this ER (Chapter 8) and has concluded that there are no impacts.
1 Environment Agency, December 2009.
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Designated Sites
2.1.6 The desk-top study for the Phase 1 Habitat survey undertaken in 2011 for the UU/WBC Westy Point development (Pennine Ecological, 2011) and biological records obtained from RECORD in 2012 revealed that Woolston Eyes, a Site of Special Scientific Interest (SSSI) is present to the east of the Westy Point site. The SSSI lies approximately 400m east from the nearest point to the proposed flood defences. In addition, there is one Site of Importance to Nature Conservation (SINC) on the site ‘Westy Point (Mersey Loop)’. The site is approximately 7.5 hectares in size and includes the northern half of the meander loop. Two further SINCs are within close proximity to the site, (although on the other side of the River Mersey) ‘The Twiggeries’ and ‘Paddington Meadows’, which is also a Local Nature Reserve (LNR) (Pennine Ecological, 2011).
Habitats
2.1.7 The baseline surveys undertaken in 2011 (Pennine Ecological) and 2015 (CH2M, Appendix 2.1) have identified that much of the land within the study area, adjoining the River Mersey, is a mosaic of semi-improved and unimproved grassland, marshy grassland, scrub and scattered trees. The ‘core’ of the site at the northern end of the peninsular is dominated by a large gently undulating area of unimproved species-poor rank grassland. This area is nutrient rich derived from past use as wastewater treatment beds. There are occasional piles of partly vegetated rubble in the grasslands. A marsh, in the western part of the grassland, north of the Feeder channel, is dominated by soft rush (Juncus effusus), with abundant regenerating willow.
2.1.8 The River Mersey is a substantial body of flowing water and is a driving factor for much of the surrounding habitats. The depths of the channel appear to limit (or obscure) most aquatic plant species. The marginal vegetation on the banks of the river is dominated by stands of common reed (Phragmites australis) amongst pockets of woodland and dense scrub.
2.1.9 Along the western side of the site is an artificial channel known as ‘The Feeder’. This acts as an over flow and only holds water during wet spells, particularly over the winter. At the southern end the channel and adjacent areas have colonised with stands of common reed, forming an area of reedbed. Along the inside bank of The Feeder channel mature hybrid black
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poplar have been planted, primarily adjacent to the school (Pennine Ecological, 2011).
2.1.10 The terrestrial habitats within the study area are considered to be of Low value (District/parish importance) within the zone of influence only. However, the habitats associated with the Westy Point ‘Mersey Loop’ SINC are considered to be of regional/ county importance and of Medium value.
2.1.11 Although water quality in the River Mersey has been affected by industrialisation, recent improvements and waterside regeneration has encouraged the restoration of fish populations, with records of salmon at Woolston Weir, upstream of the study area2. The river and associated aquatic habitat is considered to be of Medium value.
2.1.12 Full details of the habitats recorded within the study area can be found in the Latchford East (Westy Point) Ecological Appraisal (CH2M, 2015), Appendix 2.1.
Invasive Plant Species
2.1.13 Under the Wildlife and Countryside Act 1981 (as amended) it is an offence to release or allow the escape of any non-native species to the wild.
2.1.14 The invasive species Himalayan balsam (Impatiens glandulifera) is prevalent throughout the site, particularly along the river bank. A stand of Japanese knotweed (Fallopia japonica) was noted close to Kingsway Bridge, amongst a large expanse of reed and marginal vegetation. Giant hogweed (Heracleum mantegazzianum) was also recorded along The Feeder channel, western boundary and adjacent to the River Mersey at this location, as highlighted in the invasive species plan, Figure 2.1.
Species
2.1.15 Data on notable and protected species within a 2km search area has been provided by RECORD in 2012 (the biodiversity information system for Cheshire, Halton, Warrington and Wirral). Full details of which are presented in Appendix 2.2.
2 The origins of Atlantic salmon (Salmo salar L.) recolonizing the River Mersey in northwest England. Charles Ikediashi et al. Wiley On-Line Library, Ecology and Evolution, September 2012,
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2.1.16 The Extended Phase 1 Habitat Survey in 2015 (Appendix 2.1) included a check for the following protected species; bats (roosting potential in trees and structures), badger (Meles meles), otter (Lutra lutra), water vole (Arvicola terrestris), supplemented by an additional visit to undertake a habitat suitability index (HSI) assessment for great crested newts (Triturus cristatus).
2.1.17 Baseline information has been further supplemented with specialist surveys for badgers and great crested newts, as documented in Appendix 2.3 (Confidential) and 2.4
2.1.18 Table 2.1 overleaf summarises the potential species affected by the Scheme. As a precaution, a further ecological walkover survey will be undertaken to check for any changes prior to construction.
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Table 2.1: Summary of protected and notable species.
Species Results of desk-study and survey Value
Amphibians Great crested newts are fully protected by the Wildlife and Countryside Act 1981 (as amended) and Negligible. the Conservation of Habitats and Species Regulations 2010 (as amended). Other amphibians are partially protected by the Wildlife and Countryside Act, 1981 (as amended).
Amphibian records returned from RECORD comprise only records for common frog.
A HSI survey was conducted in June 2015. This concluded that GCN were unlikely to be present or pose a constraint at the site. The results of the HSI confirmed that water bodies within or adjacent to the site offered no characteristics likely to support GCN or that the works would not be a risk to the status of GCN populations in the area.
Badger Badgers and their setts are protected under The Protection of Badgers Act 1992. Medium; given the level of activity in the locality Records of badger have been returned from RECORD. Previous surveys (2011 onwards) have confirmed badger activity in the locality and several active setts have been identified.
Bats All bat species and their places of refuge are fully protected under European and UK legislation under Low (no confirmed Schedule 2 of the Conservation and Habitats Regulations 2010 (as amended) and Schedule 5 of the roosts) Wildlife and Countryside Act 1981 (as amended). Any bat populations using the site are considered to be of local value for nature conservation.
Several records for bats were returned from RECORD.
The majority of trees fall within Category 3 of the protocol for visual inspection of trees due to be affected by arboricultural work (Hundt L 2012, Bat Surveys: Good Practice Guidelines, 2nd Edition Bat Conservation Trust). Hybrid black poplars along The Feeder channel, west of the school, subject to
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Species Results of desk-study and survey Value
further survey (Myotismart, 2015). No bat roosts evident.
Breeding All breeding birds whilst actively nesting are protected in the UK under the Wildlife and Countryside Medium value because of birds Act 1981 (as amended). Some species such as barn owl, are further protected as listed under the proximity of the Schedule 1 of the same Act. Woolston Eyes SSSI to the site (<500m) and the The study area includes mature trees, scrub and grassland which are likely to be used by breeding terrestrial and riverine birds and passerine bird communities. bird community the site supports.
Reptiles Common reptiles receive a limited degree of protection in the UK under the Wildlife and Countryside Low/Zone of Influence Act 1981 (as amended). Reptiles likely to use the survey area (e.g. slow worm and grass snake) are only. Some features of protected against killing, injury and sale. value for migration and dispersal. There are no reptile records from RECORD. No reptiles have been observed during the surveys; however good reptile habitat was noted; grassland and scrub habitat within the centre and along the river margins of the study area.
Fish Due to the nature of the River Mersey with its industrial heritage, there is a legacy of several large Medium weirs and other barriers to fish migration such as culverts and flood channels that severely impact on the presence of fish and their migration. However, the river supports a highly productive coarse fishery with the largest angling clubs in the country renting access from land owners. It is also an important salmon migration route, protected under SAFFA. Salmon and eel migrate up the river every year and there is clear evidence that river lamprey have returned to the catchment.
Aquatic White-clawed crayfish (Austropotamobius pallipes) are listed on Schedule 5 of the Wildlife & Negligible.
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Species Results of desk-study and survey Value
Invertebrates Countryside Act, 1981 (as amended).
There are no records for this species within the study area and no evidence was observed during the survey. There are no works proposed in channel so impacts would be considered negligible.
Otter Otters are strictly protected by the Wildlife and Countryside Act 1981 (as amended) and by the Low (as currently no Conservation of Habitats and Species Regulations 2010 (as amended). confirmed holts)
Otter have been recorded within the 2km search area (RECORD, 2012) and evidence was noted during the 2015 Extended Phase 1 Habitat Survey (spraint on a fishing platform, eastern boundary). Otters are likely to be commuting and foraging within the riverine habitat and may use exposed tree roots, over-hangs and dense marginal vegetation for shelter/rest.
Water vole Water voles and their places of shelter or protection receive full protection under the provisions of Negligible. Section 9 of the Wildlife and Countryside Act 1981 (as amended).
No records provided by RECORD and habitat not considered suitable (fast flowing water subject to flooding). No impacts predicted.
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2.2 Likely Effects
2.2.1 The following sections identify the anticipated impacts from the construction and operational activities on the ecological receptors identified and valued in Section 2.1 and supporting baseline documents.
Construction
2.2.2 During construction it is anticipated that impacts on receptors may arise from:
Ground clearance and preparation of hard-standings for site compounds/access routes and the excavation of the embankment and flood wall footings; Vegetation clearance including tree felling and tree surgery; Construction and usage of temporary and permanent access routes, compound and welfare facilities including disposal of wastewater; Excavation, transport and storage of soils; Compaction of soils under access routes; Fill areas; Construction noise (heavy machinery) and vibration, and increased human activity; and Use of materials during construction such as oils, fuels, chemicals and unset concrete, with the potential for accidental spillage onto vegetation or into a watercourse.
2.2.3 Himalayan balsam, Japanese knotweed and Giant hogweed have been recorded within or adjacent to the site boundary (as highlighted in the invasive species plan, Figure 2.1). Appropriate bio-security measures will be implemented throughout the working period to avoid the spread of invasive species such as washing tyres and tracks of machinery and boots. A method statement will be prepared to detail clearance where required (e.g. approved herbicide spraying, cutting/strimming or pulling).
2.2.4 Following the implementation of the Scheme, an on-going monitoring and treatment programme will be undertaken to ensure that invasive plant species do not affect the integrity of the flood defences.
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General Mitigation Measures
2.2.5 During all major operations an Environmental Clerk of Works (ECW) will be available to support the project team and a summary of all the required mitigation measures from this ER have been included within an Environmental Action Plan (EAP).
2.2.6 Works will be undertaken in accordance with best practice measures and include:
Pre-construction surveys for mobile species (badger and otter) in advance of works to support the findings of prior surveys; if required, wildlife disturbance licences and method statements prepared; Working areas will be kept to a minimum and fenced off to prevent machinery from damaging adjacent vegetation. Disturbed areas will be reinstated; Trees and scrub will be retained where possible or subject to other measures (e.g. pollarding, thinning or coppicing, taking care not to damage or disturb areas of botanical interest, as highlighted on the Landscape Plans. Where they cannot be retained replacements will be planted, using native species of local provenance and of value for protected species and suitable to maintain the Westy Point SINC quality of the habitat; and A toolbox talk will be given to all site operatives at the start of construction to highlight the potential for protected species and the action to take if they are discovered. The Environmental Clerk of Works (ECW) will oversee potentially damaging works and ensure compliance with method statements.
2.2.7 The assessment of ecological effects has used the general EIA methodology3 and the Institute of Ecology and Environmental Management (IEEM) Ecological Impact Assessment (EcIA) Guidelines for Ecological Impact Assessment in the UK (IEEM, 20064) but with terminology adapted for use in a non-statutory Environmental Report.
3 The general approach is based on the determination of impact significance from a combination of the value of the baseline conditions and the magnitude of potential impacts, 4 http://www.ieem.net/ecia/EcIA%20Approved%207%20July%2006.pdf
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2.2.8 The potential impacts of the proposed works on the ecological receptors are presented in Table 2.2, along with a summary of the proposed mitigation measures. The design of the Scheme is such that impacts on ecological receptors have been avoided as far as possible.
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Table 2.2: Potential effects of the proposed works on flora and fauna.
Description of Effect Construction/ Operation Mitigation Measures Potential for effect on great crested newts Construction Timing of works – ideally pre construction site clearance/set-up be undertaken between March and July. GCN are unlikely to be using the sub-optimal habitat within the site area, but utilising optimal vegetation near ponds for foraging and commuting Toolbox talk – all site staff to receive a briefing by NE licensed ecologist Vegetation removal and topsoil strip – for ML1 only - NE licensed ecologist to carry out hand-searching of suitable GCN habitat within 24hrs of the start of works Working method – no excavated material to be left in stock-piles within 250m of ponds. Open excavations require ledges/ramps to allow GCN escape route If GCN found – all works are to cease immediately and advice taken from NE licensed ecologist Temporary disturbance to Construction Works have been designed to avoid impacts on the SSSI and habitats/species associated with the SINC. Woolston Eyes SSSI (within 500m of An ecologist acting as an Environmental Clerk of Works (ECW) Scheme boundary) will supervise vegetation clearance and the main construction Temporary damage to and loss of works. habitats within the SINC (with impacts on Working areas clearly defined and minimised; qualifying assemblages of plants) Access tracks and working areas will be delineated to minimise (Note: extensive alternative suitable damage to designated SINC habitats and features of interest (i.e. habitat nearby for birds to relocate to reed fringes). during disturbance) Vegetation clearance outside bird nesting/breeding season
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Description of Effect Construction/ Operation Mitigation Measures Temporary and permanent loss and Construction and operation (on An ECW will supervise vegetation clearance works and the main damage to marginal riverside habitat completion of works) construction works to direct works away from any key habitat during construction along The Feeder features and to minimise ecological damage. channel and Mersey Walk. Stringent controls including adherence to Pollution Prevention Guidelines to ensure no pollutants enter aquatic environments. Improvements to riparian habitat by using native species of local provenance in planting regimes. Loss of trees along Mersey Walk and The Construction and Operation Before vegetation is removed, pre-works check to confirm the Feeder Channel. absence of bats and birds. Tree/vegetation removal will be minimised. British Standards guidelines will be followed to protect retained trees. Replacement tree planting along the Feeder Channel or within the site in informal ‘clumps’ in-keeping with the existing character of the landscape, using native species of local provenance. Disturbance and damage to the River Construction Stringent controls including adherence to Pollution Prevention Mersey and associated riverine habitats Guidelines to ensure no pollutants enter aquatic environments. Defined access and working areas. No in-river works anticipated. Vegetation removal and excavation works Construction A programme of habitat manipulation (phased strimming) will be will result in direct physical damage and undertaken on all areas suitable for common reptiles/amphibians loss of habitats that may support reptile as advised by the ECW, to render them unsuitable and to and amphibian species encourage any individuals present to move away from areas where they may be injured or killed. Temporary and permanent loss of Construction and Operation Programme vegetation and tree clearance works outside the foraging and nesting habitat for breeding main bird breeding season (March to August). If unachievable, a birds from vegetation clearance and nesting bird check by a suitably qualified ecologist will be carried potential disturbance to birds from noise, out. vibration and visual impacts
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Description of Effect Construction/ Operation Mitigation Measures Potential for construction activities which Construction No night time working. impact on the river and river banks to No excavations will be left open overnight, or an escape route will potentially disturb otters and their resting be provided. sites. If during construction activities an otter is discovered, works will cease and the ECW will advise on appropriate action. If achievable following discussions with relevant stakeholders, the provision of underpasses and /or ledges at levels above 100 year flooding estimates will be considered Removal of vegetation and disturbance to Construction Leave vegetation piles from site clearance in suitable areas to invertebrates allow fauna to escape and provide additional habitat. North of working area, at Westy Loop – subject to landowner approval. Noise and vibration disturbance to fish Construction No specific mitigation required (no works in channel and vibratory and pollution of water course piling method will result in no negative impacts). Stringent controls including adherence to Pollution Prevention Guidelines to ensure no pollutants enter aquatic environments. Spreading of invasive plant species: Construction Defined working areas and access routes. Himalayan balsam, Japanese knotweed Washing of tyres and tracks of machinery and boots. A method and Giant hogweed. statement will be prepared to detail clearance where required (e.g. approved herbicide spraying, cutting/strimming or pulling).
Destruction and/or disturbance of an Construction Detailed method statement and licence application submitted for active badger sett. disturbance and/or breach of sett tunnel(s) for the flood defence works. Further general mitigation measures to minimise impacts on badgers using the site will include: The use of noisy plant and machinery in the vicinity of any protection zones should cease at least two hours before sunset. Security lighting should be directed away from setts.
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Description of Effect Construction/ Operation Mitigation Measures Chemicals should be stored as far away from the setts and badger paths as possible. Any open excavations to be covered at the end of each working day, or include a means of escape for any animal falling in (badgers will continue to use established paths across a site even when construction work has started). Any temporarily exposed open pipe system should be capped in such a way as to prevent badgers gaining access, as may happen when contractors are off-site. Water sources (for badgers) should always be safeguarded. Trees and shrubs surrounding the sett are retained as much as possible to provide cover and protection to the badger’s territory. If any trees are to be felled this must be away from setts and must not block badger paths; Roads, walls or other barriers to badger movement should not be created during construction or post-construction to ensure that setts do not become isolated from one another. Badger ‘ramps’ have been incorporated into the design to maintain foraging routes during operation of the Scheme.
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2.3 Conclusion
2.3.1 No significant effects on statutory and non-statutory designated ecological sites have been predicted.
2.3.2 A detailed Method Statement (and mitigation strategy) and licence application(s) will be submitted to Natural England for works likely to disturb and/or damage the protected mammals within the study area.
2.3.3 A set of reasonable avoidance measures have been prepared to ensure that no harm can come to great crested newts, which are afforded legal protection. These will particularly apply to works at ML1 (closest to the remote ponds upstream) but may also impose restrictions on working in other areas, ML2 and ML3. A toolbox talk will be given to site staff to ensure that they can recognise and inform supervisors in the event that a GCN is found.
2.3.4 A comprehensive landscaping and habitat enhancement scheme involving the planting of trees, shrubs and low maintenance wildflower grassland has been developed, as illustrated on Figures IMNW00699-PH3b-5372 to 5374. The majority of the site will be allowed to naturally regenerate; where planting is proposed, species of local provenance will be used such as English oak Quercus robur, field maple Acer Campestre, hazel Corylus avellana and willows Salix spp.
2.3.5 It can be concluded that the proposed Westy Flood Risk Management Scheme will be compliant with national and local planning policies relating to the protection of nature conservation interests, as documented in the supporting Ecological Appraisal.
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3.0 CULTURAL HERITAGE
3.1 Introduction
3.1.1 EA commissioned an archaeological project design5 to provide understanding of the cultural heritage assets, risks and mitigation measures for Phase 3 of the Warrington FRMS. The project design is reproduced in full as Appendix 3.1 to this environmental report. All figures and other documents referred to in this chapter may be found at appendix 3.1.
3.2 Existing Environment
3.2.1 There are no World Heritage Sites, Scheduled Monuments (SMs), Registered Parks and Gardens or Registered Battlefields along the line of the scheme.
3.2.2 There are two records of historic features in the vicinity of the Phase 3B Westy works: HER 4674/0/2 the Bye Wash or Feeder and 4674/1/1 Mersey & Irwell Navigation – Manor Lock.
3.2.3 The location of the proposed works lies on the left (south) bank of the Mersey in an area which historically formed part of the township of Grappenhall, though the area north of the High School that would be crossed by the works lay within the township of Thelwall.
3.2.4 Thelwall is first mentioned in the Anglo-Saxon Chronicle of 919 AD, where it is recorded the site of a ‘burh’ (a defended centre). The village was omitted from the Domesday Survey of 1086 and it remained a small settlement until well into the 20th century.
3.2.5 Grappenhall is first mentioned in the Domesday Book but details are sparse and allow little of the landscape to be reconstructed.
3.2.6 The Latchford Feeder Canal (HER 4674/0/2) was constructed to supply water to the Runcorn to Latchford Canal which opened in July 1804. The feeder canal was built from just above Paddington Lock on the Mersey and Irwell Navigation. The water was then carried across the Mersey in an aqueduct, which also acted as a footbridge, and followed the banks of the Mersey to arrive at Latchford Lock. It emptied into the canal just to the south of the lock.
5 Project Design for an Archaeological Mitigation on Phase 3B of the Warrington Flood Risk Management Scheme, July 2015, National Museums Liverpool Field Archaeology Unit
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3.2.7 The area is shown on the 1st Edition OS 6 in (App. 3.1: Figs. 14 and 15). The OS sheet XVI was surveyed in 1873-7 and published in 1882 (App. 3.1: Fig. 16). It shows the landscape in the study area unchanged since the 1840s and it is labelled as ‘Liable to flood’.
3.2.8 Later OS editions (App. 3.1: Figs. 17 – 21) show the area largely unchanged until the early 1950s when the Westy estate was constructed. St. John’s School was constructed in the 1960s and the area to its north occupied by a sewage works from c. 1954-1990. The sewage works included several large tanks and storage areas and the construction of these are likely to have destroyed any archaeological deposits which may have been present in that area.
3.2.9 The site was visited on 23 July 2015 by M. Adams (National Museums Liverpool Field Archaeology Unit). The following description is derived from that visit.
3.2.10 ML1 follows a modern fence which lies south of a grassed river bank. No surface features were visible. Eroded sections of bank suggest that silts and gravels lie close to the surface.
3.2.11 The route of ML2 was heavily overgrown and fenced off.
3.2.12 The route of ML3 was heavily overgrown and not directly accessible. However, it could be seen from the riverside path and Kingsway Bridge and the proposed defence will run 3-4 m east of the Feeder Canal and will not affect it. The canal is heavily overgrown and most sections are obscured, though the red sandstone parapet of a footbridge is visible at the southern end. The footpath which follows the embankment between the canal and the Mersey retains short sections of red sandstone cobbling which presumably was the original 19th century surface. Approximately 50m north of the northern end of ML3, a short section of the canal is dry and relatively clear of undergrowth. This section is revetted on both sides using roughly squared red sandstone blocks c. 0.3m across.
3.2.13 All three areas lie at a considerable distance from known areas of Roman and medieval settlement and are of very low archaeological risk. Although potentially on the site of the 10th century AD site of the burh of Thelwall this heritage asset is poorly located and is more likely to have been situated either closer to the core of the village or at Victoria Park to the west. Later mapping
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shows the area crossed by ML2 as being prone to flooding and it seems to have been low quality agricultural land from at least the 18th century until the development of the Westy estate in the mid-20th century.
3.3 Likely Effects
3.3.1 Assessment of archaeological risk has been based upon the following criteria:
Category Criteria
Very Low Areas with a documented absence of heritage assets and/or Risk Areas areas where construction consists of operations such as the insertion of piling which is unlikely to expose any archaeological deposits for recording which may be present. Low Risk Areas with no documented absence of heritage assets and/or areas where construction consists of operations such as topsoil stripping which may expose any undocumented archaeological deposits which may be present but likely to have only a limited, negligible, impact to the survival of those deposits Medium Risk Areas with documented heritage assets of low significance such as individual finds of stone or metal artefacts or poorly located buildings or other structures with an unknown chance of survival. High Risk Areas with documented heritage assets of medium significance such as clusters of finds of stone or metal artefacts or accurately located buildings or other structures with a good chance of survival.
3.3.2 ML1, ML2 and ML3 are assessed as being of very low archaeological risk. All of these areas lie at a considerable distance from known areas of Roman and medieval settlement. They remained as fields until the only documented heritage asset in the area, the Latchford Feeder Canal, was constructed in 1804. The latter is avoided by the works and there is no direct impact upon the site.
3.4 Mitigation
3.4.1 Where sheet piling occurs archaeologists will attend site if an obstruction is encountered which requires exploration or facilitation trenches to be excavated. It will be the role of the Contractor to report such instances to the Project Archaeologist and ensure attendance is arranged. Otherwise monitoring in very low risk areas will consist of ‘Tool Box Talks’ given to contractors involved in groundworks. These will provide site personnel with a basic grounding in common archaeological finds and the reporting procedures
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for archaeological finds for the project. They will include the following elements:
Short introduction to archaeological background of the scheme; Review of what sorts of structures are commonly encountered on archaeological sites and what may be expected on this scheme; Handling session of common classes of archaeological finds, including stone tools, ceramics and coins. This will include examples of what not to report; and Reporting procedures in the event of a find being made or piling obstruction encountered.
3.4.2 The Project Archaeologist will assess any find/s and determine whether a site visit or any other action is required. Finds will be collected by the Project Archaeologist, handled in accordance with standard NMLFAU procedures, and sent to nominated specialists as required for identification and analysis. If reported finds indicate that further site investigation is required, all such work will be carried out in accordance with archaeological best practice. Further details are provided in section 9.27 – s 9.40 of Appendix 3.1.
3.4.3 Monthly update reports will be provided to EA, EA’s Archaeological advisor, the Archaeological Monitor and site representative. Should site work be required, reporting will be weekly. A formal archive report will be prepared at the end of the works for submission to the Cheshire Historic Environment Record.
3.5 Residual Effects
3.5.1 No residual impacts are anticipated.
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4.0 PUBLIC RECREATION & ACCESS
4.1 Existing Environment
Public Rights of Way
4.1.1 There are no Public Rights of Way (PRoW) giving access to or running across Westy Point. The closest PRoWs have been identified from WBC’s interactive mapping website http://maps.warrington.gov.uk:8080/connect/ and are illustrated on Figure 4.1. The nearest PRoWs 246/3, 246/4 & 246/5 are on the opposite bank to the proposal site. PRoW 246/5 runs along the northern edge of the New Cut canal from Martinscroft to the top end of Paddington Bank. Two shorter lengths of PRoW connect to 246/5: 246/4 crosses the western termination of the New Cut and continues across the corner of Paddington Meadows to meet the right bank of the River Mersey, where it terminates. 246/3 continues from the western end of 246/5 towards the eastern end of Paddington Bank. PRoW 246/7 connects Wilkinson Avenue to Paddington Bank. To the southwest of the proposal site, PRoW 361/17 runs from near Manor Lock on the west side of A50 Kingsway South along the left bank of the River Mersey as far as Howley footbridge.
4.1.2 There are adopted highway footpaths on all the residential streets surrounding the proposal site, with the exception of Bridge Avenue, which is unadopted. An unadopted footway runs along the south side of Bridge Avenue.
Informal Paths/ Proposed Public Rights of Way
4.1.3 There are a number of proposed PRoWs in the area; these are also shown on Figure 4.1. The pPRoWs would formalise the existing informal paths giving access around the perimeter of Westy Point and across the amenity grassland at the end of Bridge Avenue. The relevant pPRoWs are: 00361/13/1, 00361/9/1, 00361/102/1 & 00361/144/1.
4.1.4 The pPRoWs 00361/13/1, 00361/9/1 and 00361/102/1 together form a well- defined informal path which runs around the perimeter of Westy Point, giving access to the many fishing pegs on both western and eastern sides and to the woodland/ scrub which is regenerating across the site. The paths through the
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woodland/ scrub appear to be less well-used, with the exception of a path that forms a short cut across the neck of Westy Point.
4.1.5 Access to the perimeter path is possible at the upstream end via a formalised gap in the security fence running along Mersey Walk and at the downstream end via a formalised entrance point off A50 Kingsway South, just to the south of Kingsway Bridge. Access is also possible from the eastern end of Bridge Avenue by walking across an area of amenity grassland and through some rougher grassland/ scrub. This route appears to be less well used than the access off A50 Kingsway South.
Cycling Routes
4.1.6 There are no Sustrans or other cycling routes connecting to or across the site. The closest routes identified by WBC as cycle routes run along the north side of the New Cut canal and between the Kingsway allotments from A50 Kingsway North to Paddington Bank. Both routes are on the right bank of the river Mersey and do not connect to the proposal site.
Angling
4.1.7 Warrington Anglers Association control the fishing rights along the left bank adjacent to Mersey Walk on land owned by United Utilities, on the left bank downstream from near Mersey Walk and on the right bank from upstream of Westy Point as far downstream as Kingsway Bridge. The Association offers leisure fishing for anglers who fish the river weekdays and also holds match days every Saturday between 15 June and 14th March (end of season).
4.1.8 There are also fishing pegs on the western side of Westy Point on land owned by the Manchester Ship Canal Company (Peel) and on the eastern side of the Point on land owned by United Utilities. The ownership of these rights is unknown.
Watersports
4.1.9 Warrington Rowing Club uses this reach of the River Mersey for training, the Head of Mersey race (February) and Warrington Regatta (August). The club house is located on the right bank downstream of Kingsway Bridge off Howley Lane. There are no launch points or other terrestrial facilities associated with the club’s activities on Westy Point, however viewing of the Race and Regatta
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would be possible from some sections of the path running around Westy Point.
Recreational Land/ Public Open Space
4.1.10 The public has unrestricted access to the land at Westy Point for walking/ angling and also to the land north of Bridge Avenue and at Westy Park. Cyclists are not prevented from accessing the land, although the tracks are unsuitable for road cycles.
4.2 Likely Effects
Public Rights of Way
4.2.1 Temporary effects on access by residents / pedestrians to Bridge Avenue may be caused by the need for a shared access with site traffic. No other permanent or operational effects are anticipated due to the absence of PRoW directly affected by the works.
Informal Paths/ Proposed Public Rights of Way
4.2.2 EA intends to keep access open to the pPRoWs during construction. The contractor’s working area will be securely fenced and it is anticipated that there will be sufficient room for a route to be kept open, though local temporary realignment may be necessary. Should the path require closing at the junction of ML1/ML2 then the majority of the path will remain open around Westy Point but will be signed as a dead end / no through route.
4.2.3 No operational effects are anticipated.
Cycling Routes
4.2.4 No temporary, permanent or operational effects are anticipated.
Angling
4.2.5 As noted above, access to the whole of the perimeter of Westy Point should be possible throughout the works, therefore anglers will be able to access the majority of fishing pegs. Access to pegs adjacent to ML1 may be restricted during the main piling and cladding works but attempts will be made to provide access to the pegs at other times. However it is to be expected that fish may be disturbed by noise and/ or vibration from adjacent sheet piling.
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The quality of fishing may therefore be reduced, as fish move elsewhere, though this effect will be lessened by the works taking place over the summer months which are the closed season for the river. The effects will be more noticeable at the end of the open season 15 June – end of October (when the works are programmed to be complete). Piling activities will be localised, however, and the effects will therefore not be experienced over the whole of the river bank at the same time.
4.2.6 A number of new fishing pegs will be provided as an environmental enhancement on the river bank adjacent to Mersey Walk, thereby improving facilities for angling. This has been agreed with Warrington Angling Association.
4.2.7 No operational effects are anticipated.
Watersports
4.2.8 No temporary, permanent or operational effects are anticipated.
Recreational Land / Public Open Space
4.2.9 Some land which is currently open to the public will be temporarily unavailable during the construction period of approximately 30 weeks. However, a very large area will remain accessible at all times, including the principal access routes and land to the north of the proposed flood defence alignment.
4.2.10 No operational effects are anticipated.
4.3 Mitigation
4.3.1 Mitigation proposed in respect of resident/ visitor access to Bridge Avenue will consist of maintaining a minimum 1m width footway from Bridge Avenue to A5o Kingsway South, controlled pedestrian crossing points to access Kingsway Bridge and site control of access to the site by HGVs. The majority of Bridge Avenue will be outside the working area and will remain available for parking. Bridge Avenue residents will be able to access their properties by car and exit from Bridge Avenue at all times.
4.3.2 No mitigation is proposed or required in respect of PRoWs, pPRoWs, cycling routes, angling and watersports.
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4.4 Residual Effects
4.4.1 No residual effects have been identified in respect of PRoWs, pPRoWs, cycling routes, angling and watersports.
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5.0 LANDSCAPE & VISUAL AMENITY
Baseline Conditions
5.1 Introduction
5.1.1 This section provides a summary of the potential landscape and visual impacts of the proposed scheme. It should be read in conjunction with supporting detail and drawings listed in Appendix 5.1.
5.2 Planning Context
5.2.1 There are no statutory or non-statutory designated landscapes in the vicinity of the proposed works.
5.3 Landscape Character
National / Local
5.3.1 At a national level, the site is located within Natural England’s National Character Area (NCA) 60, Mersey Valley.
5.3.2 At a local level, Warrington Borough Council’s Warrington: A Landscape Character Assessment (2007) includes the study area within Area 5A River Flood Plain: River Mersey/Bollin (east).
5.3.3 A summary of relevant key characteristics is set out in Appendix 5.1.
The Site
5.3.4 The upstream part of the scheme (ML1) is located in amenity grassland adjacent to the River Mersey. The defence will tie into higher ground as an embankment at the north end of Westy Park. To the north a flood wall will run along the edge of Mersey Walk, replacing a 1.8m high close board timber fence. Residential properties line the south side of Mersey Walk and define the townscape to the south. On the right bank is Paddington Meadows Local Nature Reserve, a large area of publically accessible grassland fringed at the water’s edge by mature trees.
5.3.5 ML2 runs across Westy Point, an area of semi-derelict land formerly a wastewater treatment works but currently characterised by dense vegetation including bramble and self-seeded scrub. The flood wall will run across the
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neck of Westy Point linking ML1 in the east to ML3 in the west, designed to complement the approved UU/WBC Westy Point development.
5.3.6 ML3 is located on the left bank of the river between Cardinal Newman Roman Catholic High School and a former (normally dry) supply channel, The Feeder. This is a semi-natural area including self-seeded scrub. Further south is residential development. The Kingsway North allotments lie on the opposite side of the river. The flood wall will be enclosed in an earth bund, tying into high ground to the rear of properties on Bridge Avenue.
Potential Impacts on Landscape Character
5.3.7 Vegetation clearance to accommodate the works will include clearance of mature/over-mature trees at Mersey Walk amenity space and along the high school boundary. Riverside trees are a feature of this part of the River Mersey valley contributing to landscape character and amenity and also helping to soften the urban edge. Impacts will be adverse in the short term and although localised will be noticeable from both sides of the river. However existing trees are over-mature and once replacement tree planting has established the effects of replacing them with new vigorous tree stock will be beneficial.
5.3.8 The new flood wall along Mersey Walk will replace an existing hard feature. It will be lower than the existing fence, reducing enclosure and enabling more extensive views towards the river. The wall will be a new locally distinctive feature in the townscape, impacts will be beneficial.
5.3.9 At Westy Point the new wall will be barely noticeable once coppiced vegetation has regrown.
5.3.10 At ML3 the species rich grassland along the bund will have a minor beneficial effect on landscape character.
Summary of Impacts
Adverse effects on landscape character and amenity during construction, resulting from site clearance, vehicles and construction plant including piling rig and site compounds / storage; Localised changes to landscape character and amenity in the short term as a result of loss of mature trees and scrub; effects will become beneficial in the medium term, increasing in magnitude long term;
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Flood walls will form a new distinctive feature along Mersey Walk, effects of new feature will be beneficial.
Mitigation
Minimise length of construction period, minimise tree clearance, use pollarding and coppicing where feasible and protect retained vegetation; New native tree and shrub planting and species rich grassland; and New flood walls along Mersey Walk will be clad in decorative concrete and include artwork panels.
Potential Impacts on Visual Amenity
5.3.11 The Zone of Visual Influence (ZVI) of the site is relatively limited as the River Mersey corridor is enclosed by vegetation and built development (see Figure 5.1).
5.3.12 Mature trees alongside Mersey Walk and The Feeder give intermittent views across the site from residences towards the river corridor. Views for residents on Mersey Walk are also partially screened by existing fencing. Riverside trees are an important contributor to visual amenity and partial enclosure of the river. Residential receptors who will be most affected by works are located in properties along Mersey Walk, Bridge Avenue and the western end of Bridgewater Avenue.
5.3.13 Existing trees help to soften the urban edge in views for recreational receptors using Paddington Meadows riverside footpath, Kingsway highway/ footway, allotments and riverside footpaths on both sides of the river, including Mersey Way long distance route.
5.3.14 However as described above, the trees are nearing the end of their useful life expectancy, they are also perceived by local people as dangerous. Once replacement tree planting and species rich grassland has established visual effects associated with a regenerated tree stock and new distinctive wall replacing the fence and opening up wider views will be beneficial for residential and recreational receptors.
Summary of Impacts
Adverse effects on visual amenity during construction as above
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Localised changes to visual amenity in the short term as a result of loss of mature trees and scrub; beneficial effects medium to long term Flood walls will form a new hard feature along Mersey Walk lower than the existing fence, reducing enclosure and allowing views over the wall and across the river, effects will be beneficial
Mitigation
Minimise length of construction period, close liaison with owners /tenants and enforcement of working hours New native tree and shrub planting and species rich grassland New flood walls along Mersey Walk clad in decorative concrete which will include artwork panels similar to those created on previous phases.
5.4 Environmental Outcomes
5.4.1 Opportunities for contributing to the EA’s environmental outcome measures have been noted during the development of the scheme and include:
Reinstatement of grassland along river and bund with species rich wildflower meadow mixes to increase visual interest and nature conservation value. Native tree and shrub planting includes a wide range of native species to increase species diversity. Potential to retain some of the timber and brash from the cleared/ pollarded trees and scrub as habitat piles. Permanent location would need to be agreed with landowners, and would also need to consider the risks associated with flooding and anti-social behaviour.
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6.0 TRAFFIC & TRANSPORTATION
6.1 Introduction
6.1.1 All figures and other appendices referred to in this chapter may be found in Appendix 6.
6.2 Existing Environment
6.2.1 The section of the River Mersey that is subject to consideration as part of this scheme is located to the east of Warrington Town Centre. The area is a mix of rural and urban land uses and the transport networks in the area are reflective of this mix. The key transport routes and provisions that could be impacted upon by the scheme are as follows:
The A50 Kingsway corridor
6.2.2 A north-south busy arterial corridor offering one of few opportunities to cross the River Mersey in Warrington, and the only one east of the town centre. A single carriageway in nature and offers pedestrian facilities and public transport opportunities. The corridor crosses the river immediately to the west of the scheme but would not be influenced physically by it. However, given its location and linkages to the wider transport network, the corridor would offer the main route for traffic associated with the scheme.
The area to the east of the A50 Kingsway corridor
6.2.3 The scheme is focussed on the left bank of the River Mersey to the east of the A50 Kingsway corridor. This is primarily a residential area and also accommodates the Cardinal Newman Catholic High School and a United Utilities pumping station.
6.2.4 Bridgewater Avenue (an east west route from the A50 Kingsway) will provide the access to the main compound at its eastern end and is fronted by residential properties on both sides (in addition to providing access to surrounding residential streets), with elements of on-street parking typical of a residential area. A satellite compound will be located off Bridge Avenue on an area of open land to the west of the school grounds. Bridge Avenue provides access to a small number of residential properties from the A50 Kingsway, although the sightlines at this junction from Bridge Avenue are not optimal.
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6.2.5 Mersey Walk, at the east of the scheme, is fronted by residential properties on its southern side (with the River itself forming the northern boundary). Given its location, this element of the network will be subject to measures that may directly influence it. However, Mersey Walk is only critical to providing access to the properties on Mersey Walk itself rather than to other residential areas. Other residential areas can be accessed via the alternative routes offered by Davenport Avenue and Brook Avenue.
6.2.6 While there are no existing PRoW (although pPRoW are noted on plans (see Figure 4.1) in the area of the scheme), the area is well used for recreational activities including for walking and fishing.
6.3 Likely Effects
6.3.1 The scheme, during its construction and then once in operation, will have some impact on the transport network. Consideration is given to these impacts in Appendix 6.1, with the following providing a summary:
Construction
Traffic impacts – Temporary vehicle movements (see Appendix 6.2) of a slight level and to be managed to an insignificant level through a Construction Traffic Management Plan (CTMP). Bridge Avenue access – sub-optimal sight lines and a need for this movement to be accommodated safely. Various construction elements (haul roads, compound access etc.) – while interacting with the surrounding road network, influences will be managed through the CTMP. Flood defence wall at Mersey Walk – requirement for phased closure of Mersey Walk impacting on Mersey Walk residents.
Operational
Traffic impacts – infrequent inspections / maintenance. Flood defence wall at Mersey Walk – no negative impact. pPRoW – no negative impact.
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6.4 Mitigation
6.4.1 With a view to the above impacts of the scheme, a number of mitigation measures are proposed. These are detailed in full in Appendix 6.3, with the following providing a summary:
A CTMP will set out the measures that will be put in place to manage traffic associated with construction activities; Some vegetation clearance/coppicing will be required north of the junction of Bridge Avenue with the A50 Kingsway to improve sightlines; Temporary works will be carried out to kerblines at the entrance to Bridge Avenue to improve access for HGVs.
6.5 Residual Effects
6.5.1 There is likely to be some unavoidable disruption caused by the construction activities, primarily to the vehicle users/residents of Mersey Walk. However, after the implementation of mitigation measures (CTMP – potentially phased closures/ diversions), these impacts are unlikely to cause significant issues. Those affected by this potential disruption will be consulted with before and during the construction period; their requirements will be taken into account in forming the detail of the required traffic management measures. All affected residents will be given advance notice of the implementation of the proposed traffic management measures. These residual impacts will be managed by CTMP measures.
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7.0 NOISE, DUST & VIBRATION
7.1 Introduction
7.1.1 Some impacts on air quality are inevitable on a construction site. However, consideration of air quality impacts has been scoped out for the following reasons:
Although there is the potential for short term impacts upon air quality as a result of the construction works, from the vehicle movements required to bring material to the site and from dusty conditions which may occur during the works, these are considered minor and short term impacts and can be successfully managed within standard construction practice; and There will not be any air quality impacts once the flood defence scheme is finished and in operation.
7.1.2 Therefore this chapter considers only the noise and vibration impacts that may occur as a result of the construction of the proposed flood defence works.
7.1.3 The methodology and assessment for calculating noise impacts (BS5228:2009-1 +A1:2014) and assumptions are described in Appendix 7.1.
7.2 Existing Environment
7.2.1 The works are split into three construction phases, ML1 (Mersey Walk), ML2 (Westy Point) and ML3 (The Feeder) as described in Section 1.8. Works at ML1 are within 14m of residential property on Mersey Walk; works at ML2 and ML3 works are within 20m of the closest buildings of the Cardinal Newman Catholic High School. At the southern end of ML3, a satellite compound is located approximately 15m to the north of residential properties to the south of Bridge Avenue. This location may also be considerably affected by road traffic noise from the A50. The main compound is located in Westy Park, at the end of Bridgewater Avenue, approximately 10m from the closest residential property. As a result of good site management, and the surrounding of the site compounds by solid fencing, noise impacts are not considered to be significant and therefore no further assessment has been undertaken.
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7.3 Baseline Noise Measurements
7.3.1 Baseline noise measurements were undertaken at the north eastern corner of the scheme, outside the most northerly property on Mersey Walk, on the 14th and 15th April 2014 (Appendix 7.2 Noise Survey Data). The results of this survey are summarised in Table 7.1:
Table 7.1: Baseline Survey Results
Monitoring LAeq, dB LAmax, dB LAmin, dB LA90, dB Location
Mersey Walk 50.2 73.3 37.8 45.0
Generic Construction Methods
7.3.2 The proposed plant and equipment to be used for each phase is included in Table 7.2. The list of plant and equipment has been derived from knowledge of similar construction sites and consultation with EA’s ECI contractor. The piling assessment is based on a ‘Movax’ excavator mounted vibratory piling system being used. Table 7.2 also shows the assumed acoustic ‘on-time’; this is defined as the percentage of the time when the equipment is operating within 3dB of its maximum – effectively the period at full power.
Table 7.2: Plant and Equipment for Proposed Construction Works
Activity BS5228 Activity Plant Description No. % On- Sound ID No Time Power Table Ref. Level No Lw dB Site Clearance 1 C.2. 7 Clearing Site Tracked excavator (14t) 69 kW 1 40% 98.0 2 C.4. 6 Distribution of Materials Dumper 60 kW (6t) 1 40% 107.0 3 Other 1 Chainsaw Stihl ms261 1 10% 112.0 Earthworks 1 C.2. 7 Clearing Site Tracked excavator (14t) 69 kW 1 40% 98.0 2 C.4. 6 Distribution of Materials Dumper 60 kW (6t) 1 40% 107.0
3 C.2. 39 Rolling and Compaction Vibratory roller (4t) 29 kW 1 30% 102.0 4 C.2. 34 Distribution of Materials Lorry (4-axle wagon) 1 30% 108.0 Vibro-Piling 1 C.3. 8 Vibratory piling (Movax) Vibratory piling rig 1 30% 116.0 2 C.2. 20 Earthworks Tracked excavator (25t) 125 kW 1 30% 96.0 Installation of Pre Cast Concrete Cladding 1 C.2. 7 Clearing Site Tracked excavator (14t) 69 kW 1 30% 98.0
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Activity BS5228 Activity Plant Description No. % On- Sound ID No Time Power Table Ref. Level No Lw dB 2 C.2. 34 Distribution of Materials Lorry (4-axle wagon) 1 40% 108.0 3 C.4. 27 Pumping Concrete Concrete mixer truck 2 5% 110.0 4 C.4. 34 Concrete Other Poker vibrator 2.2 kW 2 25% 100.0 Brickwork/ Blockwork 1 C.5. 36 Cutting concrete Slabs Hand-held circular saw (petrol) 1 10% 115.0 2 C.4. 27 Pumping Concrete Concrete mixer truck 2 5% 110.0 3 C.4. 34 Concrete Other Poker vibrator 2.2 kW 2 25% 100.0 Surfacing 1 C.5. 30 Paving Asphalt paver (+ tipper lorry) 1 30% 103.0 2 C.5. 27 Rolling and Compaction Vibratory roller 20 3 t 1 25% 95.0 Landscaping 1 C.4. 6 Distribution of Materials Dumper 60 kW (6t) 1 40% 107.0 2 C.2. 7 Clearing Site Tracked excavator (14t) 69 kW 1 40% 98.0 Timber Coping for ML2 (assumes wood cut to size off-site (supplied pre-cut)
1 Other 2 Drilling Wood De Walt Hammer Drill 1 15% 103.0 2 C.4. 87 Power for Lighting Diesel generator 7.5 kW 6 kVA 1 20% 93.0
7.4 Likely Effects
Noise
7.4.1 The calculated noise levels at each identified sensitive receptor for each phase of the works are set out in Table 7.3. Where no number is reported, the proposed design does not include those works taking place within close proximity of the closest sensitive receptor for that section of the construction works:
Table 7.3: Calculated Noise Impacts of Construction Works
Works Location Construction Units Westy
Calculated Noise Level ML2 – Cardinal Newman ML1 – Mersey Walk ML3 – Bridge Avenue LAeq Catholic High School
Site Clearance 74.2 71.1 66.3
Earthworks 75.1 72.0 67.2
Vibro-Piling 79.2 76.1 71.2
Installation of Pre Cast 73.8 Concrete Cladding
Brickwork/ Blockwork 74.3
Surfacing 66.7
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Works Location Construction Units Westy
Landscaping 71.9 68.8 63.9
Timber Coping for ML2 60.8
7.4.2 Given that construction activities will occur in the daytime, a threshold level of
75dB LAeq is proposed for construction.
7.4.3 The calculated levels take into account the background noise level plus the construction noise to provide a prediction of the impact. The levels in bold are breeches of the threshold level.
Vibration
7.4.4 There are currently no British Standards that provide a method to predict levels of vibration from construction activities, other than that contained within BS5228:2009-2+A1:2014, which relates to percussive or vibratory piling only.
7.4.5 In relation to Movax vibro-piling works that are to form the core of the works on the flood defences, Table 7.4 records the calculated maximum expected vibration levels at the closest approach in each construction area:
Table 7.4: Maximum Vibration Impacts at Closest Receptors
Location Distance from activity, Calculated Maximum Vibration metres Level, mm/s PPV
ML1 – Mersey Walk 14 8.6
ML2 – Cardinal Newman Catholic High 20 5.4 School
ML3 – Bridge Avenue 35 2.6
7.4.6 Guidance provided in BS5228-2:2009:A1:2014 (see summary in Appendix 7.1), suggests that the works are unlikely to cause cosmetic or structural damage to buildings at these distances where those buildings do not already have structural defects. At all of these distances however the vibro-piling works are at a level likely to result in complaint (Table 7.1.3 in Appendix 7.1), although it could be tolerated if prior warning is provided.
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7.5 Mitigation
7.5.1 The majority of the construction work would be undertaken between 8.00am and 6.00pm Monday to Friday and Saturday 8.00am to 1.00pm (if required) with no Sunday or bank holiday construction activity.
7.5.2 If it is anticipated that works will over-run, the Local Authority and local residents will be given as much advanced notice as possible.
7.5.3 The predicted level of noise from the piling operations, together with some of the earthworks are above the threshold level of 75dBA. Notwithstanding any other control measures, ‘Best Practicable Means’ would be employed to minimise construction impacts. These measures will be contained within a Construction Environmental Management Plan (CEMP), prepared by the contractor which will form part of the site management and control regime. Assuming these measures are implemented on site in full it is expected that noise levels will be minimised across the site, and are likely to be lower than the levels predicted.
7.5.4 Should another method of piling be required, a revised noise assessment and method statement will be issued to WBC and liaison with local residents undertaken.
7.5.5 The EA has given an undertaking to the High School to limit noisy activities, e.g. piling, during exams (May - June) and other sensitive periods in the school calendar. A liaison system will be set up with the High School to ensure that sensitive periods are respected. Temporary fencing will be used to minimise the noise impact of the earthworks at ML3; for instance using ‘Heras’ fencing clad with acoustic blankets; these have the potential to reduce the impacts by up to 15dB at the receptor.
7.5.6 Nonetheless the calculated noise levels are likely to be higher than those currently experienced around the site, and the mitigation measures proposed may not result in the complete amelioration of the noise levels generated during the construction works. With this in mind it is recognised that construction noise levels during the works will require careful control and management to ensure that the impacts are minimised.
7.5.7 As part of the scheme, an effective public liaison system will be set up. This will include giving local residents advance notice of any noisy operations and
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any construction likely to take place at weekends. The EA/ Contractor will produce newsletters and provide a rapid response process to deal swiftly and effectively with any noise complaints.
7.5.8 Vibration can only be controlled through careful management of the equipment and pre-excavation of the pile route where there are known obstructions such as services. Nonetheless, pre-commencement condition surveys of all the properties along Mersey Walk facing the works should be undertaken prior to, during and after completion of the works to monitor for damage potentially associated with vibration from construction. Such monitoring would also be used to substantiate complaints from residents that vibration levels were excessive.
7.5.9 Whilst the works are taking place vibration monitoring should be undertaken at the closest properties, and consideration of the measured levels should be made against Table B2 of BS5228:2009-2 in order to ascertain the impact on the buildings. If levels in excess of 15mm/s PPV are measured, works should cease pending the consideration of alternative methods of working.
7.6 Residual Effects
7.6.1 The most exposed residents living in the vicinity of the works on Mersey Walk and at the Cardinal Newman Catholic High School will experience a noise level above the threshold during some construction activities.
7.6.2 Where buildings do not have any structural defects, the works are unlikely to cause cosmetic or structural damage to buildings (closest residential properties along Mersey Walk) as a result of vibration caused by piling activities. However, from the calculated vibration levels reported, the potential human perception of the generated vibration in the residential environments could give rise to complaint. It is considered that the levels can be tolerated if residents are given prior warning and an explanation of the proposed works.
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8.0 WATER ENVIRONMENT
8.1 Introduction
8.1.1 This chapter considers the potential for the proposed works to affect the water environment. No in-river works are anticipated to be required; however two existing outfalls to the River Mersey will be inspected as part of the scheme and flap valves will be fitted if none are present. Works to refurbish/ install a small number of fishing pegs will also be carried out. These works are likely to be very minor (if required at all in the case of the outfalls) and will not affect WFD compliance. However, as the works could have the potential to affect compliance with the Water Framework Directive, an assessment of compliance is presented below. A Flood Risk Assessment has been prepared and will be submitted separately. Effects on existing ecology are considered in Chapter 2 Ecology.
8.1.2 The Mersey Warrington FRMS was subject to a Water Framework Directive (WFD) Compliance Assessment in June 2011 (Mersey Warrington PAR, Water Framework Directive Assessment B1464700/WFD2, Jacobs) and is reproduced as Appendix 8.1. This assessment was submitted in full in support of the original planning application for the comprehensive scheme (ref 2011/19262).
8.1.3 Since approval of the original scheme, EA has continued to investigate the Westy area and as a result has modified the proposed scheme slightly by reducing the total length of flood defences. A comparison of wall lengths is provided below.
Wall Ref. Length assessed Length now Difference (m) in 2011 report (m) proposed (m)
ML1 470 370 -100
ML2 250 242 -8
ML3 260 256 -4
Total 980 868 -112
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8.1.4 Other changes from the original scheme include changes to the construction and finishing of wall ML3. This was originally proposed as traditional flood wall; the revised proposal is for a sheet piled bund, though on the same alignment.
8.1.5 These changes are not considered to fundamentally change the assessment and conclusions arrived at in the original WFD Compliance Assessment.
8.1.6 No other changes have since taken place in the baseline environment, for Water Framework Directive purposes. The full 2011 report is provided in Appendix 8.1, with an overview derived from its Executive Summary and other information presented in the screening opinion request ER (2015) provided below.
8.2 Existing environment
8.2.1 Current information and targets are taken from the EA River Basin Management Plan North West River Basin District 2009.
8.2.2 The works are adjacent to the River Mersey, waterbody reference GB112069061010, which is classified as Heavily Modified. As a result the Biological and Hydromorphological Quality Elements of the water bodies have previously been impacted on to some degree.
8.2.3 The River Mersey is currently classed as having ‘Moderate’ Ecological Quality (EQ) and ‘Fail’ for Chemical Quality (CQ). The predicted EQ and CQ for 2015 remain the same. Current overall ecological potential is ‘Moderate’ with a status objective of ‘Good’ by 2027 for both parameters.
8.2.4 The proposal site overlies the Lower Mersey Basin and North Merseyside Permo-Triassic Sandstone Aquifers reference GB41201G101700. This aquifer is recorded as having ‘Poor’ Quantitative and Chemical Quality and predictions for 2015 remain the same.
8.2.5 The Feeder, a redundant channel formerly supplying water to the defunct Runcorn & Latchford Canal, is not a designated waterbody.
8.2.6 The scheme design incorporates sheet piled flood embankments and sheet piled flood walls, all set back from the River Mersey channel.
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8.2.7 The 2011 WFD assessment revealed that the proposed scheme would increase the length of flood defences along the affected water bodies, and would impact on 4.8% of Spittle Brook and 23% of the River Mersey water body. The scheme was considered to pose some risk to the achievement of the WFD objectives required to achieve Good Ecological Potential by 2027 for Spittle Brook and the River Mersey. However, set back defences are a hydromorphological mitigation measure, and the proportion of the Mersey water body which would be impacted by hard bank protection by the comprehensive scheme is less than 5% of the bank length of the water body. This was considered unlikely to cause a deterioration in the status of hydromorpholocial supporting elements or the WFD classification of the water body (Good Ecological Potential).
8.2.8 The slight reduction in length of the Westy flood defences, as compared to those assessed for the comprehensive scheme in 2011, would bring about a minor reduction in the total length of waterbody affected. The change, though positive, would only represent a very small fraction of the overall length of waterbody affected.
8.3 Likely effects
8.3.1 Works to fit flap valves to drainage outfalls (if found to be required) and fishing peg refurbishment/ fitting could have the potential to release sediment to the river. Good site management practices and compliance with PPG5 ‘Works in, near or over watercourses: prevent pollution’ will control the risk of sediment and/or construction materials, fuel and lubricants entering the water body.
8.3.2 The 2011 report considered the potential impacts of embankments and walls upon water quantity and flow dynamics; river continuity; depth & variation, structure & substrate of the river bed; and the structure of the riparian zone and concluded that in general there would be no impacts. It noted that the flood walls may reduce the extent of the riparian zone but that this effect would be short in relation to the whole water body extent. At the Westy site, the defences have been set back from the river as far as possible, given the constraints of existing development, in order to retain as much of the existing river floodplain.
8.3.3 The proposed works will not have any effect upon the underlying aquifer.
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8.4 Mitigation
8.4.1 The 2011 report concludes that the impacts of the comprehensive scheme as a whole would affect less than 5% of the waterbody, which is considered a minor impact on the whole waterbody. No screening of the Westy proposals against Article 4.7 of the Water Framework Directive is therefore required.
8.5 Residual effects
8.5.1 None identified.
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9.0 CUMULATIVE EFFECTS
9.1 Existing environment
9.1.1 This chapter considers potential environmental effects in the context of reasonably foreseeable future major developments. Projects that have been considered in the cumulative assessment are those within 750m of the site and considered to be ‘Major Projects’; i.e. those whose area is 10,000m2 or greater or projects that have been subject to EIA. Information was also requested from WBC regarding any other projects identified by WBC which are either currently in the planning process or have been granted planning permission and are not yet operational or have yet to be constructed.
9.1.2 Only one major scheme was identified, the previously consented UU/ WBC mixed use scheme for Westy. This scheme currently has no realistic prospect of being brought forward for construction and has therefore been discounted in this assessment.
9.2 Likely effects
9.2.1 As no major schemes have been identified in the vicinity of the flood defence scheme, no cumulative effects will occur.
9.3 Mitigation
9.3.1 No mitigation is required.
9.4 Residual effect
9.4.1 None identified.
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10.0 SUMMARY & CONCLUSION
10.1 Existing environment
10.1.1 The existing environment consists of an area of open land contained within a large meander loop of the River Mersey. Land cover consists of a mixture of mature trees, regenerating woodland, scrub and some grassland with evidence of non-native invasive weeds. There is evidence of badgers but surveys have failed to identify use of the site by other protected species. Parts of the site carry a designation as a Site of Nature Conservation Interest. The site is very low risk for cultural heritage assets, though there is a heritage feature close to the site (The Feeder). A number of informal paths circumnavigate and cross the site and access by the public is unrestricted. There are a number of fishing pegs. Views into and out of the site are restricted by trees along the embankment, some of which are quite large.
10.2 Likely effects
10.2.1 All effects are expected to commence during the construction phase and, with the exception of landscape effects, will cease at completion. Landscape effects will be experienced for a longer period, until landscape reinstatement has had time to establish; in respect of trees, this could take many years before the full intended effect is realised.
Effects on ecology
10.2.2 No significant effects are predicted on statutorily or non-statutorily protected sites. Impacts on badgers will be controlled by compliance with a protected species licence.
Effects on cultural heritage
10.2.3 ML1, ML2 and ML3 are assessed as being of very low archaeological risk. There will be no effect upon the adjacent site of The Feeder.
Effects on public recreation and access
10.2.4 There may be temporary restrictions on public access to PRoWs/ pPRoWs for the duration of the works and temporary closure of access to some fishing pegs. The quality of fishing may temporarily be reduced while piling is being carried on nearby.
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Effects on landscape and visual amenity
10.2.5 There will be adverse effects on landscape character and amenity during construction, resulting from site clearance, vehicles and construction plant including piling rig and site compounds/ storage, together with localised changes to landscape character and amenity in the short term as a result of loss of mature trees and scrub.
10.2.6 Flood walls will form a new distinctive feature along Mersey Walk.
10.3 Mitigation
Ecology
10.3.1 A licence will be obtained for any works which are required to avoid causing harm to protected species, including mammals.
10.3.2 There is a very low risk that great crested newt may be present in reach ML1, where works are closest to the ponds upstream. However, the habitat within ML1 is considered sub-optimal and no records have been returned for GCN within the wider study area. In response to this possibility, a set of reasonable avoidance measures have been prepared to check for GCN presence prior to commencement of works and a toolbox talk will be given to ensure site staff can recognise GCN in the unlikely event that they are found.
10.3.3 A scheme of habitat enhancement will be implemented as part of the landscape reinstatement. The scheme will include a mix of natural regeneration and planting of native species of local provenance.
Cultural Heritage
10.3.4 Archaeologists will attend site if an obstruction is encountered which requires further investigation. ‘Tool Box Talks’ will be given to contractors involved in groundworks to assist them in identifying heritage assets that require reporting and to specify reporting procedures.
10.3.5 Finds will be collected, handled, investigated and reported on in accordance with standard NMLFAU procedures; all such work will be carried out in accordance with archaeological best practice. A formal archive report will be prepared at the end of the works for submission to the Cheshire Historic Environment Record.
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Public recreation and access
10.3.6 Temporary diversions and signage will be put in place, giving advance notice of footpath closures/ diversions. All footpaths will be reinstated at completion. New fishing pegs will be provided.
Landscape and Visual Amenity
10.3.7 Mitigation measures incorporated into the scheme include:
minimising tree clearance; pollarding where feasible; protecting retained vegetation; new native tree and shrub planting and species rich grassland; and new flood walls along Mersey Walk creating a locally distinctive feature.
10.4 Environmental Action Plan
10.4.1 All measures identified above have been incorporated into the Environmental Action Plan Appendix 10.1.
10.5 Residual effects
10.5.1 No residual effects are predicted.
10.6 Conclusion
10.6.1 There will be some temporary effects related to construction disturbance for which mitigation will be carried out. No important or residual environmental effects are predicted. The scheme will not have any important adverse environmental effects and will bring significant benefits in terms of flood protection, together with some improvements in public amenity.
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REFERENCES
Bat Conservation Trust, 2011. Bat Surveys Good Practice Guidelines. 2nd Edition – Surveying for onshore wind farms.
Chanin, P., 2003. Ecology of the European Otter. Conserving Natura 2000 Rivers Ecology Series No.10 English Nature, Peterborough.
English Nature, 2001. Great crested newt mitigation guidelines. First edition.
Environment Agency. Managing Japanese knotweed on development sites. Available at: http://www.environmentagency.gov.uk/static/documents/ Leisure/ japnkot_1_a_1463028.pdf Last viewed 20th June 2012.
IEEM, 2006. Guidelines for Ecological Impact Assessment in the UK. Available at http://www.ieem.net/ecia/EcIA%20Approved%207%20July %2006.pdf Last viewed 20th June 2012.
JNCC, 2010. Handbook for Phase 1 habitat survey - a technique for environmental audit. First published 1990; reprinted in 1993; reprinted in 2003 with limited revisions & additions; reprinted in 2004; reprinted in 2007 with minor additions; reprinted in 2010.
National Rivers Authority, 1993. Otters and River Habitat Management. Conservation Technical Handbook Number 3.
Natural England, 2007. Disturbance and protected species: understanding and applying the law in England and Wales. Available at: http://www.naturalengland.org.uk/Images/disturbanceofprotectedspecies _tcm6- 4591.pdf
Natural England, 2009. Interpretation of ‘Disturbance’ in relation to badgers occupying a sett. Available at: http://www.naturalengland.org.uk/Images/ WMLG16_tcm6- 11814.pdf. Last viewed: 14th June 2012
Oldham et al., 2000. Evaluating the Suitability of Habitat for the Great Crested Newt (Triturus cristatus). Herpetological Journal. 10, 143-155.
Strachan R., Moorhouse T. and Gelling M., 2011. Water Vole Conservation Handbook. Edition: 3 | #196267
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GLOSSARY
Include or delete as relevant.
Air quality Area defined by the local authority as an area requiring management area management because air quality levels do not meet national air (AQMA) quality objectives Agricultural Land A series of six grades classifying soil in terms of its suitability for classification agriculture, from 1 (excellent) to 5 (very poor) Ancient Woodland Land continuously wooded since 1600 in England and Wales or 1750 in Scotland. Ancient Semi Sites that have retained woodland and shrub cover since 1600, Natural Woodland previously the site of original woodland. They may have been managed by coppicing and allowed to regenerate naturally. Aquifer An underground layer of rock with water storage capability. Area of Outstanding Areas formally designated under the National Parks and Access Natural Beauty to the Countryside Act (1949) to protect parts of the countryside (AONB) of high scenic quality that cannot be selected for National Park status as they do not have opportunities for outdoor recreation. The Countryside Agency is the government agency responsible for designating AONBs and advising the government. Archaeological An area specified by Local Planning Authorities to help protect Priority Areas archaeological remains that might be affected by development. Baseline A description of the present state of the environment with the consideration of how the environment would change in the future in the absence of the plan/programme/project as a result of natural events and other human activities. Baseline studies/ Collection of information about the environment which is likely to survey be affected by the project
Biodiversity Action An agreed plan for a habitat or species, which forms part of the Plan (BAP) UK’s commitment to biodiversity in response to the Convention on Biological Diversity, Rio de Janeiro 1992 Brownfield site A site which has been previously developed, often a disused factory site or industrial area. Catchment Used to manage water resources to balance the need for abstraction abstraction and management of the aquatic environment in management consultation with local interested parties. strategy (CAMS) Catchment A surface water catchment is the total area that drains into a river. A groundwater catchment is the total area that supplies the groundwater part of the river flow. Catchment Flood A high level plan carried out by the Environment Agency in order Management Plan to manage the risk of flooding to people, property and the (CFMP) environment in an integrated way. These plans form the basis of future flood risk management proposals. Character area An area of land with distinctive landscape features resulting from an interaction of wildlife, landforms, geology, land use and human activity as defined by the Countryside Agency. Conservation Area An area designated under the Town and Country Planning Act, 1990 to protect its architectural or historic character. Countryside and This Act applies to England and Wales and has five parts: - Rights of Way Access to the countryside (CRoW) Act 2000 Public rights of way and road traffic
Mersey Warrington FRMS – Phase 3B Environmental Report
Nature conservation and wildlife protection Areas of outstanding natural beauty Miscellaneous and Supplementary This act increases the protection of SSSIs. Environment Agency plans/programmes/projects must gain consent for works in or near SSSIs using a CRoW form. Countryside Sub-divisions of England into areas with similar landscape Character Areas character as categorised by the Countryside Agency. These are used when assessing the impact of a plan/programme/project on its local landscape. Critical Ordinary Stretches of Ordinary Watercourse that have been classified as Watercourses critical in terms of flood risk by the Environment Agency and local (COWs) Authorities. Many COWs are currently being reclassified as Main River for the Environment Agency to take over responsibility from the local authority or Internal Drainage Board. Cumulative Impacts The combined impacts of several projects within an area, which individually are not significant, but together amount to a significant impact. Department for The government department responsible for flood management Environment, Food policy in England and Rural Affairs (DEFRA) Ecological Impact An assessment of the potential effects of a proposed Assessment (EcIA) development on species, habitats and sites that are of value to conservation or protected by national and/or international legislation. Ecosystems The services that ecosystems provide which can provide value to Services people and the wider environment. Includes: Supporting services (e.g. oxygen production), Provisioning services (e.g. fuel), Regulating services (e.g. climate), Cultural services (e.g. recreation). English Heritage Government statutory advisor on the historic environment, (EH) funded jointly by the government and by revenue from properties and members. Environmental A standalone report or section within another environmental Action Plan (EAP) impact assessment document which ensures that constraints, objectives and targets set in the main Environmental Report/Statement are actually carried out on the ground. Actions are separated into those to be carried out before, during and after construction. Environmental “EIA is an assessment process applied to both new development Impact Assessment proposals and changes or extensions to existing developments (EIA) that are likely to have significant effects on the environment. The EIA process ensures that potential effects on the environment are considered, including natural resources such as water, air and soil; conservation of species and habitats; and community issues such as visual effects and impacts on the population. EIA provides a mechanism by which the interaction of environmental effects resulting from development can be predicted, allowing them to be avoided or reduced through the development of mitigation measures. As such, it is a critical part of the decision- making process.” www.iema.net/eiareport Environmental (1) The document produced for projects that do not require Report (ER) statutory environmental impact assessment, but where environmental impact has been carried out. This includes
Mersey Warrington FRMS – Phase 3B Environmental Report
projects that require planning permission from the local authority but the effects of the proposal will not be significant. An ER usually follows the same template as an Environmental Statement, but is less detailed. (2) The document produced to describe the strategic environmental assessment process carried out for strategies. This report can be standalone or contained as an appendix to a strategy. Environmentally An area of particularly high landscape, wildlife or historical Sensitive Area importance within which DEFRA offered inducements to (ESA) encourage farmers to adopt agricultural practices to safeguard or enhance those features. Payments have now been superseded by the ESS Environmental The document produced to describe the environmental impact Statement (ES) assessment process where statutory environmental impact assessment is required. Flood alleviation Scheme designed to reduce the risk of flooding in a given area scheme (FAS) Flood Cell A discrete area subject to flooding from failure of defences at a specific point or length. Flood defence A structure (or system of structures) that reduce flooding from rivers or the sea Floodline Environment Agency flood warning system, accessible by telephone or internet and updated every 15 minutes Flood risk A long term (50 years or more) plan for coastal or river management management to reduce the risk of flooding and carry out. They strategy (FRMS) are more detailed than CFMPs. Flood management A river or coastal reach subject to flooding from similar unit (FMU) processes. Such a unit may consist of one or more flood cells Flood risk mapping A system of maps created by the Environment Agency to show areas that are at risk of a flood that has a 1 in 100 chance (or higher) of occurring in any given year
Geographical A computer based system for capturing, storing, integrating, Information Systems manipulating, analysing and displaying data spatially. (GIS) General Permitted The Town and Country Planning (General Permitted Development Order Development) Order 1995 sets out what may be built without (GPDO) needing planning permission. Part 15 applies specifically to the Environment Agency Habitats Directive EC Directive (92/43/EEC) on the Conservation of natural habitats and of wild flora and fauna. Implemented (with the Birds Directive (79/409/EEC)) in the UK as the Conservation (Natural habitats and wild flora and fauna) Regulations (1994). This establishes a system of protection of certain flora, fauna and habitats considered to be of International or European conservation importance. Sites are designated as Special areas of conservation (SACs), special protection areas (SPAs) and/or Ramsar sites. Any developments in or close to these designated areas are subject to the Habitat Regulations for approval of English Nature. Together these sites are referred to as the Natura 2000 network. Health impact “A combination of procedures, methods and tools by which a assessment policy, programme or project may be judged as its potential effects on the health of a population, and the distribution of those
Mersey Warrington FRMS – Phase 3B Environmental Report
effects within a population.” World Health Organisation. Higher level scheme See ESS Indicative landscape Overlay of existing environment and scheme proposals to plan (ILP) highlight environmental constraints and opportunities including designated sites and landscape character. Land Drainage The Environmental Impact Assessment (Land Drainage Regulations Improvement Works) Regulations (SI 1999 No. 1783) apply to improvement works to land drainage infrastructure undertaken by land drainage bodies, including the Environment Agency. Such works are permitted development and therefore not subject to the Town and Country Planning EIA requirements. Local Biodiversity A local plan with targets to protect and enhance biodiversity to Action Plan (LBAP) achieve national targets and also to protect locally important species Local Nature Local Nature Partnerships were one of the key proposals made Partnerships in the June 2011 Natural Environment White Paper. Their purpose is to bring a diverse range of individuals, businesses and organisations together to create a vision and plan of action about how the natural environment can be taken into account in decision making in that area. Local Nature Nature reserves designated under the National Parks and Reserve (LNR) Countryside Act (1949) for locally important wildlife or geological features. They are controlled by local authorities in liaison with English Nature. Main river A watercourse designated by DEFRA. The Environment Agency has permissive powers to carry out flood defence works, maintenance and operational activities on main rivers. Responsibility for maintenance rests on the riparian owner. Marine Management An executive non-departmental public body established under Organisation the Marine and Coastal Access Act 2009 with responsibilities including marine licensing and working with Natural England and others to manage a network of marine protected areas (marine conservation zones and European marine sites). Mitigation measures Actions that are taken to minimise, prevent or compensate for adverse effects of the development. National Nature Nature reserves designated under the National Parks and Reserve (NNR) Countryside Act (1949) for nationally important wildlife or geological features (these may be the best examples in the country). They are controlled by English Nature. National Rivers A predecessor of the Environment Agency. Authority (NRA) Natural Areas Sub-divisions of England, characterised by wildlife and natural features. There are 120 Natural Areas in England. Designations are managed by English Nature. Natural England Natural England is an Executive Non-departmental Public Body responsible to the Secretary of State for Environment, Food and Rural Affairs. Their purpose is to protect and improve England’s natural environment and encourage people to enjoy and get involved in their surroundings. Their aim is to create a better natural environment that covers all of our urban, country and coastal landscapes, along with all of the animals, plants and other organisms that live with us. Nature Improvement 12 new nature zones in England covering hundreds of Areas thousands of hectares receiving Government funding to create wildlife havens, restore habitats and encourage local
Mersey Warrington FRMS – Phase 3B Environmental Report
people to get involved with nature. Nitrate vulnerable Area where surface or ground waters are above the standards zone (NVZ) set by the Nitrates Directive (91/676), as implemented in England and Wales by SI2164/2002 Ordinary water A watercourse not designated as main river. The local authority course or Internal Drainage Board has permissive powers to maintain them. Ramsar site Wetland site of international importance listed under the Convention on Wetlands of International Importance under the Conservation of Waterfowl Habitat (Ramsar) Convention 1973. Riparian Area of land or habitat adjacent to rivers and streams Scheduled Nationally important historic sites, buildings or monuments monument identified by English Heritage and designated by the Secretary of State for Culture, Media and Sport. Any work affecting a scheduled monument must gain consent from English Heritage under the Ancient Monuments and Archaeological Areas Act (1979). Scoping The process of deciding the scope or level of detail of an EIA/ SEA. During this stage the key environmental issues (likely significant effects) of a project/strategy are identified so that the rest of the process can focus on these issues. Issues may result from the proposal itself or from sensitivities of the site. Screening (1) For environmental impact assessment, the process of deciding which developments require an environmental impact assessment to be carried out and whether this will be statutory. (2) For strategic environmental assessment, the decision on which plans, strategies or programmes require strategic environmental assessment to be carried out and whether this will be statutory. Screening opinion Statutory opinion from the competent authority as to whether a proposed project requires statutory environmental impact assessment according to the Environmental Impact Assessment Regulations. SEA Directive European Directive 2001/42/EC “on the assessment of the effects of certain plans and programmes on the environment” SEA Regulations The regulations transposing the SEA Directive into UK law Site of Special Nationally important sites designated for their flora, fauna, Scientific Interest geological or physiographical features under the Wildlife and (SSSI) Countryside Act (1981) (as amended) and the Countryside Rights of Way (CRoW) Act (2000). Special Area for Sites of European importance for habitats and non bird species. Conservation (SAC) Above mean low water mark they are also SSSIs. Special Protection An area designated for rare or vulnerable birds, or migratory Area (SPA) and birds and their habitats, classified under Article 4 of the EC proposed Special Directive on the Conservation of Wild Birds (79/409/EEC). They Protection Area are also SSSIs. Proposed sites receive the same protection as (pSPA) fully protected sites Standard of The level of protection from flooding, for example an SoP of 1 in protection (SoP) 100 means that the flood defences in an area provide protection from floods up to a size of flood with a probability of occurring of 1 in 100 in any year Strategic SEA is a process designed to ensure that significant Environmental environmental effects arising from proposed plans and Assessment programmes are identified, assessed, subjected to public participation, taken into account by decision-makers, and
Mersey Warrington FRMS – Phase 3B Environmental Report
monitored. SEA sets the framework for future assessment of development projects, some of which require Environmental Impact Assessment (EIA). SEA is carried out according to the requirements of the SEA Directive 2001/42/EC Strategy See Flood Risk Management Strategy Sustainable A concept defined by the Brundtland Report (1987) as development “Development that meets the needs of the present without compromising the ability of future generations to meet their own needs” Sustainable urban A system of controlling the quality and quantity of water run-off so drainage systems as to prevent flooding or pollution. (SuDs) Washland Area of land adjacent to a watercourse, which is allowed to flood when the watercourse overtops its banks. Water Framework EC Directive (2000/60/EC) on integrated river basin Directive (WFD) management. The WFD sets out environmental objectives for water status based on ecological and chemical parameters, common monitoring and assessment strategies, arrangements for river basin administration and planning and a programme of measures in order to meet the objectives. Water level A plan that sets out water level management requirements in a management plan defined floodplain area (usually an SSSI) which is designed to (WLMP) reconcile different needs for drainage.
Mersey Warrington FRMS – Phase 3B Environmental Report