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Education Funding Agency Priority Schools Building Programme Flood Risk Assessment: Clough Hall Technology College

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Education Funding Agency Priority Schools Building Programme Flood Risk Assessment: Clough Hall Technology College Education Funding Agency Priority Schools Building Programme Flood Risk Assessment: Clough Hall Technology College Issue | 9 September 2014 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 232207-70 Ove Arup & Partners Ltd The Arup Campus Blythe Gate Blythe Valley Park Solihull B90 8AE United Kingdom www.arup.com Education Funding Agency Priority Schools Building Programme Flood Risk Assessment: Clough Hall Technology College Contents Page 1 Introduction 1 1.1 Proposed Development 1 1.2 Local Stakeholders and Operating Authorities 2 1.3 Data Sources 3 2 Flood Risk Planning Context 4 2.1 National Planning Policy Framework 4 2.2 Flood and Water Management Act 2010. 6 3 The Sequential and Exception Tests 7 3.1 The Sequential Test 7 3.2 The Exception Test 7 4 Existing Conditions 8 4.1 Site Description 8 4.2 Site Topography 8 4.3 Existing Surface Water Features 9 4.4 Existing Sewage Infrastructure 9 4.5 Existing Hydrogeology 10 5 Operating Authorities 12 5.1 Staffordshire County Council (SCC) 12 5.2 Environment Agency (EA) 13 5.3 United Utilities (UU) 13 5.4 Severn Trent Water (STW) 14 6 Flood Risk Assessment 15 6.1 Fluvial Flood Risk 15 6.2 Groundwater Flood Risk 15 6.3 Overland Flow/ Pluvial Flood Risk 16 6.4 Infrastructure Failure 18 6.5 Artificial Drainage System 19 7 Conclusions 22 | Issue | 9 September 2014 \\GLOBAL.ARUP.COM\EUROPE\MIDLANDS\JOBS\232000\232207-70 CLOUGH HALL\4 INTERNAL DATA\4-04 REPORTS\4-05-03 CIVIL\FRA\20140909_CLOUGHHALL_FRA_ISSUE.DOCX Education Funding Agency Priority Schools Building Programme Flood Risk Assessment: Clough Hall Technology College Appendices Appendix A Consultation Appendix B Drawings | Issue | 9 September 2014 \\GLOBAL.ARUP.COM\EUROPE\MIDLANDS\JOBS\232000\232207-70 CLOUGH HALL\4 INTERNAL DATA\4-04 REPORTS\4-05-03 CIVIL\FRA\20140909_CLOUGHHALL_FRA_ISSUE.DOCX Education Funding Agency Priority Schools Building Programme Flood Risk Assessment: Clough Hall Technology College 1 Introduction As part of the Priority School Building Programme (PSBP), the Education Funding Agency (EFA) proposes to rebuild the Clough Hall Technology College in Stoke-on-Trent. Arup have been commissioned by EFA to undertake a Flood Risk Assessment (FRA), to support a planning application for the proposed redevelopment site of the Clough Hall Technology College. The proposed development site is located off Fourth Avenue in Stoke-on-Trent, Staffordshire. The report has been prepared with reference to the National Planning Policy Framework (NPPF)1, the NPPF Technical Guidance2 and follows the methodology prescribed in CIRIA document C624: Development and Flood Risk, Guidance for the Construction Industry3. This report was prepared by Arup on behalf of EFA in connection with the planning application for the proposed development site in Staffordshire. It takes into account our client's particular instructions and requirements and addresses their priorities at the time. This report was not intended for and should not be relied on by any third party not involved in the planning application. 1.1 Proposed Development It is proposed to redevelop the site to provide a modern two storey building within the existing building footprint. The new school building will be constructed in phases to coincide with the demolition of the existing building. The new building footprint will be approximately 2,430m². The remaining site is proposed to be redeveloped as playing fields and green landscaping, interspersed with hardstand (car parks, foot paths, etc.). There will be a slight reduction in impermeable area extents, from 2.95 Ha to 2.40 Ha. The car park will be located at the north of the site and vehicular access to the site will be retained in its current position, from Fifth Avenue. It is proposed that there will be additional pedestrian accesses at the north, east and south of the site. In terms of onsite drainage, only the area in the vicinity of the new school building, at the southeast of the site, is affected by the development. A preliminary design for this is shown in Appendix B. The existing and proposed layouts of the site are shown in Figure 1 and Figure 2. 1 Department for Communities and Local Government (DCLG) (2012). National Planning Policy Framework (NPPF) 2 DCLG (2012). NPPF Technical Guidance 3 CIRIA (2004). C624 – Development and Flood Risk | Issue | 9 September 2014 Page 1 \\GLOBAL.ARUP.COM\EUROPE\MIDLANDS\JOBS\232000\232207-70 CLOUGH HALL\4 INTERNAL DATA\4-04 REPORTS\4-05-03 CIVIL\FRA\20140909_CLOUGHHALL_FRA_ISSUE.DOCX Education Funding Agency Priority Schools Building Programme Flood Risk Assessment: Clough Hall Technology College Figure 1: Existing layout of the site Figure 2: Proposed layout of the site 1.2 Local Stakeholders and Operating Authorities With regards to development planning, residual flood risk and water related issues; there are a number of key local stakeholders and/or approving authorities associated with the development of the proposed site. These are described as follows: | Issue | 9 September 2014 Page 2 \\GLOBAL.ARUP.COM\EUROPE\MIDLANDS\JOBS\232000\232207-70 CLOUGH HALL\4 INTERNAL DATA\4-04 REPORTS\4-05-03 CIVIL\FRA\20140909_CLOUGHHALL_FRA_ISSUE.DOCX Education Funding Agency Priority Schools Building Programme Flood Risk Assessment: Clough Hall Technology College • The Environment Agency (EA) - They have wide ranging powers for main rivers and groundwater bodies under the Water Resources Act (1991)4 and the Environment Act (1995)5. Under the Flood and Water Management Act (FWMA) (2010)6 they have a responsibility to produce a national strategy towards managing flood risk and are a statutory planning consultee for development and flood risk issues; • Staffordshire County Council (SCC) - The Council are the Lead Local Flood Authority (LLFA) on local flood risk matters under the FWMA (2010) and as such have the primary responsibility for local flood risk matters. In addition, when the FWMA is fully enacted the National Standards for Sustainable Drainage will be released and the Sustainable Drainage Approval Bodies (SABs) will be formed. This will allow SCC to assess and approve sustainable drainage design associated with proposed development and take over the adoption of approved sustainable drainage schemes; and, • Severn Trent Water (STW) - The sewerage undertaker and primary supplier of potable water with powers under The Water Industry Act 19917. • United Utilities (UU) – The sewerage undertaker with powers under The Water Industry Act 19918. 1.3 Data Sources The key data used in compiling this FRA is listed below; • EA indicative flood mapping as indicated on their website9; • EA groundwater mapping also available on their website; • Halcrow (July 2008) ‘Newcastle-under-Lyme Borough Council Level 1 Strategic Flood Risk Assessment’ • Consultation with EA; • Consultation with SCC; • STW and UU asset management records; • Consultation with STW and UU; • Greenhatch Group underground utilities surveys; • Mott MacDonald (September 2013) ‘Geoenvironmental Desk Study’; and • Mott MacDonald (October 2013) ‘Flood Risk and Drainage Issues - Broad Overview’. 4 Her Majesty’s Stationary Office (HMSO) (1991). Water Resources Act 5 HMSO (1995). Environment Act 6 HMSO (2010). Flood and Water Management Act 7 HMSO (1991). Water Industry Act 8 HMSO (1991). Water Industry Act 9 www.environment-agency.gov.uk | Issue | 9 September 2014 Page 3 \\GLOBAL.ARUP.COM\EUROPE\MIDLANDS\JOBS\232000\232207-70 CLOUGH HALL\4 INTERNAL DATA\4-04 REPORTS\4-05-03 CIVIL\FRA\20140909_CLOUGHHALL_FRA_ISSUE.DOCX Education Funding Agency Priority Schools Building Programme Flood Risk Assessment: Clough Hall Technology College 2 Flood Risk Planning Context 2.1 National Planning Policy Framework The Department for Communities and Local Government published the NPPF on the 27th March 2012. This is a wholesale reform of the planning system and replaces all existing Planning Policy Guidance (PPG’s) and Statements (PPS’s) in an effort to make the planning system less complex and more accessible. It transfers more responsibility onto individual planning authorities and states that there should normally be a practice in favour of ‘sustainable development’. The aim of NPPF is to ensure that flood risk is taken into account at all stages in the planning process, to avoid inappropriate development in areas at risk of flooding and to direct development away from areas at highest risk. It does this by formulating a risk-based approach towards flooding to be adopted at all levels of planning. NPPF requires that the “Sequential Test” is applied during the planning process. The Sequential Test aims to ensure that preference for developable land is given to land that has the lowest risk of flooding, based on the data available. The starting point for the ‘Sequential Test’ is the system of ‘Flood Zoning’. This is a system that assesses the risk posed by rivers and in coastal areas estuaries and the sea. This information is collected and made available by the EA and the LPA. The Flood Zoning system adopted in England is described in Table 1 below, as defined in NPPF technical guidance. Table 1: Flood Zoning System used across England as defined in NPPF Flood Zone Definition Zone 1 This zone comprises land assessed as having a less than 1 in 1000 annual Low Probability probability of river or sea flooding in any year (<0.1% Annual Exceedance Probability (AEP)). Zone 2 This zone comprises land assessed as having between a 1 in 100 and 1 in Medium 1000 annual probability of river flooding (1% - 0.1% AEP) or between a 1 in Probability 200 and 1 in 1000 annual probability of sea flooding (0.5% - 0.1% AEP) in any year. Zone 3a This zone comprises land assessed as having a 1 in 100 or greater annual High Probability probability of river flooding (>1% AEP) or a 1 in 200 or greater annual probability of flooding from the sea (>0.5% AEP) in any year.
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