Water Cycle Evidence for the Vale of Aylesbury Plan

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Water cycle evidence for the Vale of Aylesbury Plan

Final document

Document: 001 Version: 4

Aylesbury Vale District Council

September 2012

Water cycle evidence for the Vale of Aylesbury Plan

Final document

Document: 001 Version: 4

Aylesbury Vale District Council

September 2012

Halcrow Group Limited Burderop Park, Swindon, Wiltshire SN4 0QD tel 01793 812479 fax 01793 812089 halcrow.com

Halcrow Group Limited has prepared this report in accordance with the instructions of client Aylesbury Vale District Council for the client’s sole and specific use. Any other persons who use any information contained herein do so at their own risk.

Halcrow Group Limited Burderop Park, Swindon, Wiltshire SN4 0QD tel 01793 812479 fax 01793 812089 halcrow.com

Water cycle evidence for the Vale of Aylesbury Plan Introduction

Document history

Water cycle evidence base for the Vale of Aylesbury Plan Aylesbury Vale District Council

This document has been issued and amended as follows:

Version Date Description Created by Verified by Approved by

1 17/01/2012 Draft document template for Andy McConkey approval

2 21/03/2012 Draft final report for steering Andrew Kamunda Andy Andy group consultation only McConkey McConkey

3 25/07/2012 Final version for signoff Lizzie Shipman Andy McConkey

4 10/09/2012 Final version for publication Lizzie Shipman Andy McConkey

Water cycle evidence for the Vale of Aylesbury Plan Introduction

Contents

1 Introduction 14 1.1 Project background 14

2 Planning and Development 15 2.1 Context and Vale of Aylesbury Plan 15

3 Flood Risk and Surface Water Management 23

4 Water services infrastructure and water companies 31 4.1 Legislation 31 4.2 Regulation 34 4.3 Developer Contributions 34

5 Water quality and wastewater treatment 36 5.1 Wastewater and Water quality 36 5.2 Water quality and wastewater treatment methodology – larger settlements 36 5.3 Water quality and wastewater treatment methodology – smaller settlements 37 5.4 Wastewater treatment capacity 37

6 Drainage network infrastructure 39 6.1 Assessment methodology 39

7 Water resources and water supply 40 7.1 Water supply infrastructure assessment methodology 40

8 Sustainable settlement analysis 41 8.1 Larger settlements in the Northern Vale market area 41 8.1.1 Buckingham market sub area 42 8.1.2 Winslow 46 8.2 Smaller settlements in the Northern Vale market area 49 8.2.1 Beachampton 49 8.2.2 Akeley 51 8.2.3 Gawcott 54 8.2.4 Thornborough 57 8.2.5 Tingewick 60 8.2.6 Chackmore 63 8.2.7 Radclive 66 8.2.8 Newton Longeville 68

Water cycle evidence for the Vale of Aylesbury Plan Introduction

8.2.9 Drayton Parslow 70 8.2.10 Great Horwood 73 8.2.11 Little Horwood 77 8.2.12 Hillesden 80 8.2.13 Thornton 83 8.2.14 Middle Claydon 85 8.2.15 Chetwode 89 8.2.16 Padbury 91 8.2.17 Calvert Green 94 8.2.18 Steeple Claydon 97 8.2.19 Stowe 100 8.2.20 Mursley 102 8.2.21 Swanbourne 105 8.2.22 Nash 108 8.2.23 East Claydon 111 8.2.24 Granborough 114 8.2.25 Stewkley 117 8.2.26 Marsh Gibbon 120 8.3 Larger settlements in the Southern Vale market area 124 8.3.1 Aylesbury 125 8.3.2 Haddenham 129 8.3.3 Wendover 132 8.4 Smaller settlements in the Southern Vale market area 136 8.4.1 Aston Abbots 136 8.4.2 Slapton 139 8.4.3 Ivinghoe 143 8.4.4 Pitstone 146 8.4.5 North Marston 148 8.4.6 Oving 151 8.4.7 Whitchurch 154 8.4.8 Edlesborough 157 8.4.9 Cublington 161 8.4.10 Wing 164 8.4.11 Wingrave 167 8.4.12 Rowsham 169 8.4.13 Creslow 171 8.4.14 Aston Clinton 173 8.4.15 Buckland 176 8.4.16 Drayton Beauchamp 179 8.4.17 Halton 182 8.4.18 Hardwick 185

8.4.19 Hulcott 189 8.4.20 Ashendon 193

Water cycle evidence for the Vale of Aylesbury Plan Introduction

8.4.21 Cheddington 196 8.4.22 Chilton 200 8.4.23 Chearsley 203 8.4.24 Cuddington 206 8.4.25 Grendon Underwood 209 8.4.26 Kingswood 212 8.4.27 Long Crendon 215 8.4.28 Ludgershall 217 8.4.29 Marsworth 220 8.4.30 Boarstall 223 8.4.31 Shabbington 226 8.4.32 Dinton 229 8.4.33 Quainton 232 8.4.34 Waddesdon 235 8.4.35 Westcott 238 8.4.36 Oakley 241 8.4.37 Worminghall 244 8.4.38 Brill 247 8.4.39 Ickford 250 8.4.40 Weedon 253

9 Conclusions and recommendations 256

Appendix A - Aylesbury Sub-Market Area flood risk management maps

Appendix B - Buckingham Sub-Market Area flood risk management maps

Appendix C - Aylesbury Vale Northern Area flood risk management maps

Appendix D- Aylesbury Vale Southern Area flood risk management maps

Appendix E - Interactive SUDS map

Water cycle evidence for the Vale of Aylesbury Plan Introduction

Glossary

Annual Exceedance Probability – Used in this report to refer to flood risk and flood defence standard of protection. A standard of protection to the 1 in 100 year event means that the location has a 1% chance (1 in 100) of flooding in any year, this is the 1% Annual Exceedance Probability (AEP). This does not mean that if the location floods in one year, it will definitely not flood again for the next 99 years, or that if it has not flooded for the previous 99 years, that it will definitely flood this year.

Annual Monitoring Report (AMR) - Assesses the implementation of the Local Development Scheme and the extent to which policies in Local Development Documents are being successfully implemented.

Appropriate Assessment – Required by the Habitats Directive (92/43/EEC) for all plans or projects which, either alone or in combination with other plans or projects, would be likely to have a significant effect on a European classified conservation site, or are not directly connected with the management of the site for nature conservation. Its purpose is to assess the implications of a proposal in respect to the site’s conservation objectives. The assessment process is not specified by the regulations but is usually an iterative process at a level dependent on the location, size and significance of the proposed plan or project. English Nature can advise on whether a plan or project is likely to have a significant effect and thus require assessment.

Area Action Plans – Development Plan Documents that provide a planning framework for areas of change and areas of conservation.

Areas of Outstanding Natural Beauty (AONB) - Were brought into being by the same legislation as National Parks - the National Parks and Access to the Countryside Act of 1949. They are fine landscapes, of great variety in character and extent. The criteria for designation are their outstanding natural beauty. Many AONBs also fulfil a recreational role but, unlike national parks, this is not a designation criteria. The Countryside Agency and the Countryside Council for Wales are responsible for designating AONBs and advising Government on policies for their protection.

Asset Management Plan (AMP) - a plan for managing an water companies’ infrastructure and other assets in order to deliver an agreed standard of service. The Asset Management Plans are submitted to Ofwat every 5 years and forms the basis by which water rates are set. These plans identify the timescales and levels of investment required to maintain and upgrade the serviceability of the assets.

Biochemical oxygen demand (B.O.D) – This is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period. The term also refers to a chemical procedure for determining this amount. This is not a precise quantitative test, although it is widely used as an indication of the organic quality of water. The BOD value is most commonly expressed in milligrams of oxygen consumed per litre of sample during 5 days of incubation at 20 °C and is often used as a robust surrogate of the degree of organic pollution of

Water cycle evidence for the Vale of Aylesbury Plan Introduction

water.BOD can be used as a gauge of the effectiveness of wastewater treatment plants.

BREEAM - The Building Research Establishment Environmental Assessment Method. This is a method of assessing the environmental sustainability of a new building. The BREEAM has been superseded by the Code for Sustainable homes for residential developments, but is still in common usage for non-residential developments.

Catchment Abstraction Management Strategy (CAMS) – a strategy to assess how much water can be abstracted to meet its many economic uses – agriculture, industry, and drinking water supply – while leaving sufficient water in the environment to meet ecological needs.

Catchment Flood Management Plan (CFMP) – A strategic planning tool through which the Environment Agency seeks to work with other key decision-makers within a river catchment, to identify and agree policies for sustainable flood risk management.

Code for Sustainable Homes – the Code for Sustainable Homes - a new national standard for sustainable design and construction of new homes—was launched in December 2006. The code measures the sustainability of a new home against a range of sustainability criteria. The code sets minimum standards for energy and water use in new properties, and gives homebuyers more information about the environmental impact of their new home.

Combined Sewer Overflow (CSO) - Combined sewer overflow is the discharge of untreated wastewater from a sewer system that carries both sewage and storm water (a combined sewerage system) during a rainfall event. The increased flow caused by the storm water runoff exceeds the sewerage system’s capacity and the sewage is forced to overflow into streams and rivers through CSO outfalls.

Communities and Local Government (CLG) - Communities and Local Government is the government department responsible for policy on local government, housing, urban regeneration, planning and fire and rescue. They have responsibility for all race equality and community cohesion related issues in England and for building regulations, fire safety and some housing issues in England and Wales. The rest of their work applies only to England. (http://www.communities.gov.uk/corporate/about/)

Core Strategy - A Withdrawn Development Plan Document which included the long- term spatial planning vision and objectives for the area. It contained a set of strategic policies that are required to deliver the vision including the broad approach to development. The Core Strategy was withdrawn in October 2010.

Critical Drainage Areas - The Town and Country Planning (General Development Procedure) (Amendment) (No. 2) (England) Order 2006 introduces the concept of Critical Drainage areas as “an area within Flood Zone 1 which has critical drainage problems and which has been notified… [to]…the local planning authority by the Environment Agency”.

Water cycle evidence for the Vale of Aylesbury Plan Introduction

Development Plan - As set out in Section 38(6) of the Planning and Compulsory Purchase Act (2004), an authority’s development plan consists of the relevant Regional Spatial Strategy (or the Spatial Development Strategy in London) and the Development Plan Documents contained within its Local Development Framework.

Development Plan Documents (DPDs) - Spatial planning documents within the Council’s Vale of Aylesbury Plan which set out policies for development and the use of land. Together with the Regional Spatial Strategy they form the development plan for the area. They are subject to independent examination. They are required to include a core strategy and a site allocations document, and may include area action plans if required; other DPDs may also be included, e.g. development control policies.

Dry Weather Flow (DWF) – The flow received or discharged by a wastewater treatment works in dry weather. Dry weather flow is regulated variable that is consented by the Environment Agency in a wastewater treatments works’ consent to discharge under the Water Resource Act 1911.

DEFRA - Department of Environment, Food and Rural Affairs Development.

Environment Agency - The leading public body for protecting and improving the environment in England and Wales. Flood management and defence are a statutory responsibility of the Environment Agency; it is consulted by local planning authorities on applications for development in flood risk areas, and also provides advice and support to those proposing developments and undertaking Flood Risk Assessments. The Environment Agency reports to DEFRA.

Environment Agency Flood Zones - Nationally consistent delineation of ‘high’ and ‘medium’ flood risk, published on a quarterly basis by the Environment Agency.

Flood Estimation Handbook - The latest hydrological approach for the estimate of flood flows in the UK.

Flood Risk Assessment – A site specific investigation usually carried out by the site developers to be submitted as part of their planning applications. It assesses both current flood risk to the site and the impact of development of the site to flood risk in the area.

Freshwater Fish Directive - The EC Directive on Freshwater Fish is designed to protect and improve the quality of rivers and lakes to encourage healthy fish populations. In 2013, this directive will be repealed. Waters currently designated as Fish Directive waters will become protected areas under the Water Framework Directive.

Future Water - The Government’s new water strategy for England, Future Water was published 7 February 2008. This strategy sets out the Government’s long-term vision for water and the framework for water management in England. (http://www.defra.gov.uk/Environment/water/strategy/index.htm)

Green infrastructure – green infrastructure is the physical environment within and between our cities, towns and villages. It is a network of multi-functional open

Water cycle evidence for the Vale of Aylesbury Plan Introduction

spaces, including formal parks, gardens, woodlands, green corridors, waterways, street trees, and open countryside.

Good Ecological Status (GES) – The Water Framework Directive (more formally the Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000 establishing a framework for Community action in the field of water policy) is a European Union directive which commits European Union member states to achieve good qualitative and quantitative status of all water bodies (including marine waters up to kilometer from shore) by 2015. It is a framework in the sense that it prescribes steps to reach the common goal rather than adopting the more traditional limit value approach. Good ecological status is defined by each member state, and is set at a level lower than a theoretical reference point of pristine conditions, i.e. in the absence of anthropogenic influence.

Habitats Regulation Assessment - An assessment of the potential effects of planning policies on European nature conservation sites, which lie within and outside the Borough

Infrastructure – The basic physical systems of a community's population, including roads, utilities, water, sewage, etc. These systems are considered essential for enabling productivity in the economy. Developing infrastructure often requires large initial investment, but the economies of scale tend to be significant. Water services infrastructure refers to infrastructure that provides clean water, urban drainage and wastewater services.

Inset appointment - An inset appointment is made when an existing water and/or sewerage undertaker is replaced by another as the supplier of water and/or sewerage services for one or more customers within a specified geographical area.

Local Authority or Local Planning Authority (LA or LPA) – This is the local authority or council that is empowered by law to exercise planning functions, often the local borough or district council. National parks and the Broads authority are also considered to be local planning authorities. County councils are the authority for waste and minerals matters.

Local Development Documents (LDDs) – the collective term for Development Plan Documents and Supplementary Planning Documents.

Local Development Framework (LDF) – This is the name for the portfolio of Local Development Documents. It consists of the Local Development Scheme, a Statement of Community Involvement, Development Plan Documents, Supplementary Planning Documents, and the Annual Monitoring Report.

Local Development Scheme (LDS) - Sets out the programme for preparing Local Development Documents. All authorities must submit a Scheme to the Secretary of State for approval within six months of commencement of the 2004 Act (thus all authorities should now have submitted an LDS). LDSs are subject to review.

‘Making Space for Water’ (DEFRA 2004) - The Government’s new evolving strategy to manage the risks from flooding and coastal erosion by employing an integrated portfolio of approaches, so as to: a) reduce the threat to people and their property; b)

Water cycle evidence for the Vale of Aylesbury Plan Introduction

deliver the greatest environmental, social and economic benefit, consistent with the Government's sustainable development principles, and c) secure efficient and reliable funding mechanisms that deliver the levels of investment required.

Mean Trophic Rank (MTR) - The Mean Trophic Rank has been developed for England and Wales to implement the EC Urban Waste Water Directive: it is used to assess the impact of point sources on the river. It is based on the combination of species at a site and, for each species, its indicator value and its abundance.

Minimum Residual Flow (MRF) - The flow set at a river gauging station to protect downstream uses. When flow falls below this level controlled abstractions are required to cease.

National Environment Programme (NEP) - A key component of a periodic review is the National Environment Programme (NEP). The NEP is a list of environmental improvement schemes that ensure that water companies meet European and national targets related to water.

National Planning Policy Framework (NPPF) – The Government’s national planning policy guidance produced in March 2012 covering all town planning issues including flood risk and climate change. The Government also produced a Technical Guidance document on flood risk to accompany the publication of the NPPF.

Ofwat – The Water Services Regulation Authority (Ofwat) is the body responsible for economic regulation of the privatised water and sewerage industry in England and Wales. Ofwat is primarily responsible for setting limits on the prices charged for water and sewerage services, taking into account proposed capital investment schemes (such as building new wastewater treatment works) and expected operational efficiency gains.

Per capita consumption (PCC) – This is the typical or average amount of a substance used by one person per day. Used in this study with reference to domestic water consumption.

Periodic Review (PR) – Every five years Ofwat sets the price limits that water companies can charge their customers for the supply of water and the treatment of waste water for the following five years. This Periodic Review determines how much water companies can spend on maintaining their services as well as improving them. The next periodic review is in 2014 and called PR14..

Planning Policy Statements (PPS) - The Government has replaced these national planning guidance notes with the National Planning Policy Framework from March 2012.

Pollutants – A substance or condition that contaminates air, water, or soil. Pollutants can be artificial substances, such as pesticides and PCBs, or naturally occurring substances, such as oil or carbon dioxide, that occur in harmful concentrations in a given environment

Previously Developed (Brownfield) Land - Land which is or was occupied by a building (excluding those used for agriculture and forestry). It also includes land

Water cycle evidence for the Vale of Aylesbury Plan Introduction

within the curtilage of the building, for example a house and its garden would be considered to be previously developed land. Land used for mineral working and not subject to restoration proposals can also be regarded as Brownfield land.

QMED – The median annual maximum flood flow.

Regional Spatial Strategy (RSS) - Sets out the region’s policies in relation to the development and use of land and forms part of the development plan for local planning authorities. The RSS the covers Aylesbury Vale is the South East Plan. The Government has indicated they intend to revoke RSSs.

River Basin Management Plan (RBMP) – A strategic tool introduced by the Water Framework Directive (2000/60/EC) which integrates the management of land and water within a river basin (river catchment or group of catchments). The river basin may cover several political areas.

River Quality Objective (RQO) – agreed by Government as targets for all rivers in England and Wales when the water industry was privatised in 1989. The targets specify the water quality needed in rivers if we are to be able to rely on them for water supplies, recreation and conservation.

Sensitive Areas (Eutrophic) (SAe) – Surface waters must be designated as Sensitive Areas under the Urban Waste water Treatment Directive (UWWTD) if they are eutrophic or if they may become eutrophic in the future if protective action is not taken (Annex II A(a)). Discharges to Sensitive Areas Eutrophic require more stringent treatment for nitrogen and/or phosphorus.

Sites of Importance for Nature Conservation (SINCs) - is a designation used in many parts of the United Kingdom to protect areas of importance for wildlife at a county.

Site of Special Scientific Interest (SSSI) – a site identified under the Wildlife and Countryside Act 1981 (as amended by the Countryside and Rights of Way Act 2000) as an area of special interest by reason of any of its flora, fauna, geological or physiographical features (basically, plants, animals, and natural features relating to the Earth's structure).

Special Protection Area (SPA) - A Special Protection Area or SPA is a designation under the European Union Directive on the Conservation of Wild Birds. Under the Directive, Member States of the European Union (EU) have a duty to safeguard the habitats of migratory birds and certain particularly threatened birds. Together with Special Areas of Conservation (SACs), the SPAs form a network of protected sites across the EU, called Natura 2000.

Statement of Community Involvement (SCI) - Sets out the standards which authorities will achieve with regard to involving local communities in the preparation of local development documents and development control decisions. It is subject to independent examination.

Strategic Direction Statement – 25 year strategic plan prepared by a water company and regulated by Ofwat. The companies' strategic direction statements were first

Water cycle evidence for the Vale of Aylesbury Plan Introduction

developed as part of the 2009 price review process to provide a 25 year context for the companies' five-year business plans.

Strategic Environmental Assessment (SEA) - A generic term used to describe environmental assessment as applied to policies, plans and programmes. The European ‘SEA Directive’ (2001/42/EC) requires a formal ‘environmental assessment of certain plans and programmes, including those in the field of planning and land use’.

Strategic Flood Risk Assessment (SFRA) – a Level 1 SFRA is a district-wide assessment of flood risk, usually carried out by a local authority to inform the preparation of its Local Development Documents (LDDs) and to provide the information necessary for applying the Sequential Test in planning development. A Level 2 SFRA is a more detailed assessment produced where the Exception Test is required for a potential development site, or to assist in evaluating windfall planning applications.

Strategic Housing Land Availability Assessment (SHLAA) - A SHLAA is an assessment of the potential of a borough to accommodate housing development over a period of 15 years from the date of adoption of the LDF Core Strategy. The SHLAA forms part of the evidence base for the emerging Local Development Framework (LDF), and inform the identification of potential new housing sites to be allocated in the LDF.

Super Output Areas (SOA) – a new national geography created by the Office for National Statistics (ONS) for collecting, aggregating and reporting statistics.

Supplementary Planning Documents (SPDs) - Provide supplementary information in respect of the policies in Development Plan Documents. They do not form part of the Development Plan and are not subject to independent statutory examination, but are normally subject to public consultation.

Surface water management plans (SWMP) - Recent government policy development has promoted the production of surface water management plans (SWMPs). SWMPs will look at existing problems and inform planning decisions for new development. In the case of existing problems, SWMPs are particularly appropriate in situations where the causes of flooding are unclear or complex. In the case of new developments, SWMPs are a useful tool in areas of high growth where they can support a ‘masterplan’ approach to development to secure optimal outcomes

Sustainability Appraisal (SA) - Tool for appraising policies to ensure they reflect sustainable development objectives (i.e. social, environmental and economic factors) and required in the 2004 Act to be undertaken for all local development documents. It incorporates Strategic Environmental Assessment.

Sustainable Development – “Development that meets the needs of the present without compromising the ability of future generations to meet their own needs” (The World Commission on Environment and Development, 1987).

Sustainable Drainage Systems (SUDS) – Surface water drainage systems which manage runoff in a more sustainable way than conventional drainage, through

Water cycle evidence for the Vale of Aylesbury Plan Introduction

improved methods of managing flow rates, protecting or enhancing water quality and encouraging groundwater recharge. A variety of types are available and can be chosen as appropriate for the location and needs of the development, and many have added benefits such as enhancement of the environmental setting, provision of habitat for wildlife and amenity value for the community.

The Sequential Test - Informed by a Strategic Flood Risk Assessment, a planning authority applies the Sequential Test to demonstrate that there are no reasonably available sites in areas with less risk of flooding that would be appropriate to the type of development or land use proposed.

UK Climate Impacts Programme (UKCIP) -UKCIP02 is a government funded programme which helps organisations to adapt to inevitable climate change. UKCIP publishes climate change scenarios on behalf of the Government.

Wastewater Treatment Works (WwTW) - Sewage treatment, or domestic wastewater treatment, is the process of removing contaminants from wastewater and household sewage, both runoff (effluents) and domestic. It includes physical, chemical, and biological processes to remove physical, chemical and biological contaminants. Its objective is to produce an environmentally-safe fluid waste stream (or treated effluent) and a solid waste (or treated sludge) suitable for disposal or reuse (usually as farm fertilizer).

Water Framework Directive (WFD) – a European Union directive which commits member states to making all water bodies (surface, estuarine and groundwater) of good qualitative and quantitative status by 2015.

Water neutrality - If a development is to be ‘water neutral’ then the total demand for water should be the same after the new development is built, as it was before. That is, the new demand for water should be offset in the existing community by making existing homes and buildings in the area more water efficient. (http://www.environment-agency.gov.uk/research/library/publications/40737.aspx)

Water resource zone – a geographical area defined by the water supply/demand balance in the region such that all customers within it receive the same level of service in terms of reliability of water supply.

Water Resource Management Plans (WRMP) - Water companies in England and Wales have a statutory duty to prepare, consult, publish and maintain a water resources management plan under new sections of the Water Industry Act 1991, brought in by the Water Act of 2003. Water resource management plans show how the water companies intend to supply your water over the next 25 years. In doing so, they need to take into account population changes, climate change and protecting the environment from unnecessary damage caused by taking too much water for use.

Water Resources Management Units (WRMU) – hydrological unit used to manage and assess the environmental implications of abstraction in the Environment Agency’s Catchment Abstraction Management Strategies

Water cycle evidence for the Vale of Aylesbury Plan Introduction

Water stress - Water stress occurs when the demand for water exceeds the available amount during a certain period or when poor quality restricts its use. Water stress causes deterioration of freshwater resources in terms of quantity (e.g. aquifer overexploitation or dry rivers) and quality (eutrophication, organic matter pollution, and saline intrusion).

Water Treatment Works (WTW) - Water treatment describes those processes used to make water more acceptable for a desired end-use. In this report WTW is used to describe water company owned assets that provide drinking water for everyday use through the water companies water supply network.

Water cycle evidence for the Vale of Aylesbury Plan Introduction

1 Introduction

1.1 Project background Halcrow were commissioned by Aylesbury Vale District Council (AVDC) to provide the water cycle evidence base for the preparation of the Value of Aylesbury Plan.

The project is has been supported by the Environment Agency, Anglian Water and Thames Water who form the project steering group, and who have provided data, information and staff resources to provide an agreed evidence base.

The evidence base in this report is structured as described below.

Chapter 2: Planning and development.

This details the planning context of the Vale of Aylesbury Plan and the scale and location of development that has been assessed through this study.

Chapter 3: Flood risk and surface water management.

This chapter introduces current policy and process with respect to planning development and flood risk and surface water management.

Chapter 4: Water services infrastructure and water companies

This chapter discusses how water service infrastructure is managed and planned by water companies, and how this impacts planning and development

Chapter 5: Water quality and wastewater treatment

This chapter details the methodology followed by the study to assess water quality and wastewater treatment implications of development, including how the Water Framework Directive impacts on planning and development

Chapter 6: Wastewater network infrastructure

Chapter 7: Water resources and water supply

This chapter details the methodology followed by the study to assess water resources and water supply implications of development.

Chapter 8: Sustainable settlement analysis

This chapter contains the results of the assessments described by chapters 3 - 7. The chapter is broken down into two subsections, Northern Vale area and Southern Vale area. Each subsection is then broken down into discrete settlements, with each settlement being assessed for all the water cycle elements. Therefore the complete results are presented settlement by settlement.

Chapter 9: Conclusions and recommendations

This chapter brings together and summarises the settlement analysis, to group conclusions about environmental capacity and water services infrastructure by market area.

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Water cycle evidence for the Vale of Aylesbury Plan Planning and Development

2 Planning and Development

2.1 Context and Vale of Aylesbury Plan

2.1.1 This document has been prepared to inform the Vale of Aylesbury Plan (VAP). As a published evidence base; the findings and conclusions will also be available to inform planning applications. Halcrow were asked by AVDC to consider the effect of different levels of new development 2011-2031 at the identified settlements in the district. The levels of development were based on the notional ranges in the December –January 2012 consultation on the Vale of Aylesbury Plan. The levels of development in the VAP Pre Submission Draft will need to account for the conclusions of this Water Cycle Study (WCS) and other work on constraints, housing and employment, land availability, infrastructure and planning permissions prior to Autumn 2012.

2.1.2 The purpose of this Water Cycle Study (WCS) is to identify the water services infrastructure required between years 2011-2031 and to identify the potential constraints to development with respect to water services infrastructure and environmental capacity. The prime objective of this Planning and Development section is to set outthe planning information at this time including details of:-

• The district-wide ranges of housing development that were consulted on by AVDC in the December-January 2012 Stage 1 consultation on VAP

• The sub market areas identified by AVDC within the district that will be used to apportion housing development amongst sustainable settlements within these areas

• The scenarios for ranges of housing development within the sub market areas that have been identified by AVDC for consultation on VAP in December- January 2012

• ‘Areas of search’ around larger sustainable settlements to be identified by Halcrow for the purposes of evaluating water cycle issues.

Details of the Stage 1 Vale of Aylesbury Plan public consultation (December-January 2012) are available at:- http://www.aylesburyvaledc.gov.uk/local-development- plans/planning-policy/vale-of-aylesbury-plan-/consultation-vale-aylesbury-plan- december-2011/

2.1.3 This Water Cycle evidence base document will assess capacity around the larger sustainable settlements and also smaller sustainable settlements to identify positive and negative attributes that can inform the next stages of the Vale of Aylesbury Plan. Halcrow’s assessment includes consideration of the ease of supply, likely scale and cost of infrastructure, achievable timing of infrastructure delivery and impacts on the water environment. For the purposes of these assessments, scenarios of housing development were identified by AVDC to be tested. These are detailed in Table 2-1.

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Table 2-1 Housing scenarios tested by this study

2.1.4 The scope of this WCS is as follows:-

• To carry out a ‘Red Amber Green’ Assessment of capacity and potential showstoppers based on the above notional scenarios of new housing 2011-2031 and the impact on wastewater treatment works infrastructure, wastewater networks and water supply at Aylesbury, Buckingham, Winslow, Haddenham and Wendover.

• Identify for Aylesbury, Buckingham , Winslow, Haddenham and Wendover, flood risk including surface water flooding constraints around settlement quadrants and relevant Sustainable Drainage Solutions (SUDS) mitigation

• At smaller sustainable settlements identified by AVDC, identify if there are any major constraints for 20 and 100 new homes in terms of the impact on wastewater treatment works, waste water networks and water supply infrastructure

• At smaller sustainable settlements identified by AVDC, identify the consented capacity for water quality at the WwTw and when this would be breached (if it would be)

• At smaller sustainable settlements identified by AVDC, set out flood risk including surface water flooding constraints around settlements and relevant SuDs mitigation

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2.2 Study Area

Figure 2-1 Map of the sub-market study areas within the district

Source: AVDC (2011) http://www.aylesburyvaledc.gov.uk/local-development- plans/planning-policy/vale-of-aylesbury-plan-/consultation-vale-aylesbury-plan- december-2011/

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The study area is the following settlements in the above sub market areas within the district.

Table 2-2 The settlements within the sub-market areas identified in the district

Area Parishes Aylesbury Sub- Aylesbury, Bierton with Broughton, Buckingham Park, Coldharbour, Market Fleet Marston, Quarrendon, Stoke Mandeville, Stone with Bishopstone and Hartwell, Watermead, Weston Turville Southern Vale Ashendon, Aston Abbotts, Aston Clinton, Aston Sandford, Boarstall, Brill, Buckland, Chearsley, Cheddington, Chilton, Creslow, Cublington, Cuddington, Dinton-with-Ford and Upton, Dorton, Drayton Beauchamp, Edgcott, Edlesborough, Grendon Underwood, Haddenham, Halton, Hardwick, Hogshaw, Hulcott, Ickford, Ivinghoe, Kingsey, Kingswood, Long Crendon, Ludgershall, Marsworth, Mentmore, Nether Winchendon, North Marston, Oakley, Oving, Pitchcott, Pitstone, Quainton, Shabbington, Slapton, Upper Winchendon, Waddesdon, Weedon, Wendover, Westcott, Whitchurch, Wing, Wingrave with Rowsham, Woodham, Worminghall, Wotton Underwood Buckingham Buckingham, Maids Moreton Sub-Market Northern Vale Addington, Adstock, Akeley, Barton Hartshorn, Beachampton, Biddlesden, Calvert Green, Charndon, Chetwode, Drayton Parslow, Dunton, East Claydon, Foscott, Gawcott with Lenborough, Granborough, Great Brickhill, Great Horwood, Hillesden, Hoggeston, Leckhampstead, Lillingstone Dayrell with Luffield Abbey, Lillingstone Lovell, Little Horwood, Marsh Gibbon, Middle Claydon, Mursley, Nash, Newton Longville, Padbury, Poundon, Preston Bissett, Radclive-cum-Chackmore, Shalstone, Soulbury, Steeple Claydon, Stewkley, Stoke Hammond, Stowe, Swanbourne, Thornborough, Thornton, Tingewick, Turweston, Twyford, Water Stratford, Westbury, Whaddon, Winslow

Source: AVDC (2011) http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/consultation-vale-aylesbury-plan-december-2011/

2.3 Project Steering Group

2.3.1 The project steering group was established on 12 October 2011 following the appointment of Halcrow to carry out this work for AVDC. Halcrow had produced similar water cycle strategy evidence studies to inform the Core Strategy which was ultimately withdrawn by AVDC in October 2010. The project team established in October comprised:-

• Halcrow

• Aylesbury Vale District Council Forward Plans

• Aylesbury Vale District Council Drainage Engineers (check department name)

• The Environment Agency

• Bedford Group Internal Drainage Boards

• Anglian Water Services Limited (AWS)

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• Thames Water Utilities Limited (TWUL)

2.3.2 TWUL and AWS are responsible for providing water supply (including meeting water quality objectives) and wastewater collection and treatment. The Environment Agency is a Government body responsible for:-

• the provision of a framework to comply with Environmental standards including those set in European Directives)

• national policy to safeguard water resources and water quality

• technical advice to national Government planning policy and decisions on flood risk avoidance, management and sustainable drainage (as set out in the National Planning Policy Framework (NPPF) and NPPF Technical Guidance)

• technical advice to national Government planning policy and decisions on how the water environment contributes to green infrastructure objectives

• being the decision making body on drainage matters on Main Rivers (including the River Thame and River Great Ouse)

2.3.3 The Bedford Group of Internal Drainage Boards ensures that that the Boards in the Bedford Group comply with the current UK legislation and EU directives in terms of providing and maintaining an arterial surface water drainage system that is:-

• managed to achieve sustainable standards of flood protection

• conserves and enhances the environment whenever possibly practical

• ensures there is no net loss of biodiversity

2.4 Related Studies 2.4.1 An updated Strategic Flood Risk Assessment Level 1 (2012) (SFRA1) for identified settlements across the district has been prepared by Aylesbury Vale District Council to inform this Water Cycle evidence. This SFRA1 is an update of that produced by Royal Haskoning in April 2007 to inform the Core Strategy and Aylesbury Allocated Sites Development Plan Documents (DPD). The SFRA was published at the end of August 2012.

2.4.2 A Level 2 SFRA for Aylesbury Town by Royal Haskoning was published by AVDC in April 2009 to provide detailed flood risk advice on avoiding site-specific, and not worsening town-wide flood risk, should any of the then proposed northern, eastern or southern strategic development sites (in the now withdrawn Core Strategy) be taken forward to DPD allocation and into planning applications. The study identified the need for new flood storage areas, improvements to those existing, sustainable drainage schemes and other mitigation measures to make development acceptable in flood risk terms. Since that time in March 2012, the Council resolved to grant planning permission subject to the signing of a Section 106 agreement for an outline planning application to the east of Aylesbury, Broughton Crossing (ref. 10/02649/AOP). This is a residential-led mixed use scheme for 2450 homes and 10ha of employment land, transport, education and green infrastructure. The findings of the SFRA Level 2 have been important in assessing the merits of the application. The SFRA 2 has been updated for the Vale of Aylesbury Plan in August 2012. The SFRA

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Level 2 can be viewed and downloaded at http://www.aylesburyvaledc.gov.uk/planning-building/planning-policy/avldf- framework/avldf-evidence-base/environment-evidence/strategic-flood-risk- assessment-aylesbury-town-level-2/aylesbury-town-level-2-strategic-flood-risk- assess/

2.4.3 The Housing and Economic Growth Assessment (September 2011) by GL Hearn identified a range of socio-economic forecasts to 2031 that helped AVDC in preparing the number of jobs and homes ranges that feature in the December-January 2012 consultation. The GL Hearn study looked at the effect of population and demographic changes, economic projection, and what had happened in the district’s past. This work identified a number of different ways of developing a district-wide housing employment target to be achieved under proposals in the VAP. The Housing and Economic Growth Assessment also identified four sub-regional housing market areas in the district, each with their own unique needs and circumstances. The December – January 2012 consultation on the VAP takes forward the housing and employment ranges in the GL Hearn study and considers how to apportion housing development across the four submarket areas. To view or download the document, please see http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/consultation-vale-aylesbury-plan-december-2011/

2.4.4 The Consultation Draft – Sustainability Appraisal (SA) Stage 1 (Jobs and Housing Levels and Apportionment Scenarios for Homes across the District) (November 2011) was published to accompany the consultation on the number of new jobs and homes that should be planned for in the district and the broad distribution of where new homes should go. This is the first appraisal stage of the SA for the Vale of Aylesbury Plan. It assesses the different levels of homes and jobs for the district and the distribution scenarios against the 20 SA objectives, so that the impacts of each can be considered. SA Objective 18 is ‘Flooding’ whilst Objective 19 is ‘Water and Climate Change’. To view or download the document, please see http://www.aylesburyvaledc.gov.uk/local-development-plans/planning-policy/vale- of-aylesbury-plan-/sustainability-appraisal/sustainability-appraisal-stage-1/

2.4.5 A Level 1 Buckinghamshire Minerals and Waste SFRA by Jacobs was published by Buckinghamshire County Council in February 2011. The document serves a similar purpose as the SFRA by AVDC except it was used to inform the Minerals and Waste Core Strategy and sites to be allocated by Buckinghamshire County Council for new facilities in the Minerals and Waste Development Framework (MWDF) . The Jacobs report has provided useful factual information that has been utilised in the 2012 SFRA update by AVDC. For more information about this and related BCC documents please see http://www.buckscc.gov.uk/bcc/waste_mineral_plans/evidence_base.page?

2.5 Planning Requirements

2.5.1 The Council has commenced its new development plan document (DPD), entitled the Vale of Aylesbury Plan (“VAP”). The Initial public consultation on this Plan was between December 2011-January 2012. The VAP Pre-Submission Draft will be published in Autumn 2012 with a public examination and final adoption in Spring 2013. Separate DPDs will be produced for Delivery Policies (produced through 2013 and adopted in 2014) and Allocations (if required). A summary timetable is set out as follows:-

Table 2-3 The 3 stage process and timings of the VAP programme

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2.5.2 The December-January 2012 consultation document proposed an overall district-level of new jobs and homes and a broad distribution of where a proportion of new homes in the district could go. The options for district-wide provision and sub-district apportionment to housing market areas were as per Table 2.4 below :-

Table 2-4 Vale of Aylesbury plan. Housing and jobs ranges, stage 1 issues and options, December 2011

2.5.3 The December-January Stage 1 Consultation on the Vale of Aylesbury Plan considered the following options for the apportionment of housing to sub market areas (Table 2-5 shown below).

Table 2-5 Apportionment of housing to sub market areas in the stage 1 consultation

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Source AVDC November 2011

2.5.4 Each of the sub-market areas are defined in the Housing Numbers and Apportionment Options Briefing Paper September 2011 available at http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/consultation-vale-aylesbury-plan-december-2011/

and shown in section 2.2.

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3 Flood Risk and Surface Water Management

3.1 Flood risk policy context

3.1.1 Since the Aylesbury Town water cycle study, and the Aylesbury Rest of Vale District Water Cycle Study were published in 2009 and 2010 there have been a number of important policy and legislative changes with respect to local flood risk management. These changes improve the way that local flood risk is managed in England and Wales.

3.1.2 First, the Flood and Water Management Act (2010), which implemented many of the recommendations from Sir Michael Pitt’s review of the summer 2007 flooding, sets out new roles and responsibilities for upper tier and county authorities (called ‘Lead Local Flood Authorities’) to manage local flood risk from surface runoff, groundwater and ordinary watercourses. A key part of the Act was ensuring that a partnership approach is adopted to manage local flood risk.

3.1.3 Alongside the Act the Flood Risk Regulations came into force in December 2009, which set out a process for Lead Local Flood Authorities (LLFA) to understand local flood risk across their area and prepare detailed flood maps and a Flood Risk Management Plan in the areas most vulnerable to flooding.

3.1.4 Aylesbury Vale District Council is not a LLFA. Buckinghamshire County Council is the LLFA with responsibility for all of Buckinghamshire, including Aylesbury Vale District. However, the changes do have implications on Planning Authority responsibilities, and on Developers, and this chapter provides an overview of both the Act and the Regulations, and then provides a series of tables documenting how both pieces of legislation may impact on Planning Authorities and Developers.

The Flood and Water Management Act 2010

3.1.5 The Act aims to improve the management of water resources and create a more comprehensive and risk based regime for managing the risk of flooding from all sources. The Act states that its purpose is to “make provision about water, including provision about the management of risks in connection with flooding and coastal erosion.” The key features of the Act are that it:

• Gives the Environment Agency an overview role of flood and coastal erosion risk management and gives them responsibility for fluvial (including main rivers and coastal rivers), coastal and reservoir flood risk;

• Gives Unitary Authorities and County Councils a LLFA role, allocating responsibility for managing local flood risks – surface runoff, groundwater and ordinary watercourses. Although the LLFA will not assess risk from those identified above as the responsibility of the Environment Agency, where there is interaction between sources, the LLFA must act as the coordinating authority.

3.1.6 A key implication for County Councils and Unitary Authorities is the introduction of the LLFA role, which enhances their responsibilities so that they lead the co- ordination of flood risk management in their areas. As a LLFA, Buckinghamshire

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County Council will take on these new powers and responsibilities. These include:

• A requirement to develop, maintain, apply and monitor a strategy for local flood risk management for the county;

• The management of local flood risk, which includes surface runoff, groundwater and ordinary watercourses;

• Leading the co-ordination of local flood risk management, bringing together all relevant bodies to help manage local flood risk;

• Upon becoming aware of a flood, the LLFA must, to the extent it considers necessary or appropriate, investigate which authority has flood risk management responsibilities and whether that authority has or is proposing to exercise those functions;

• Maintaining a register of structures or features which are considered to significantly affect flood risk and record ownership and state of repair;

• Powers to do works to manage flood risks from surface runoff and groundwater (powers to do works on ordinary watercourses remain with either district authority or Internal Drainage Board (IDB);

• Powers to designate structures and features that affect flooding;

• The approval, adoption and maintenance of SUDS; and

• Contributing towards achievement of sustainable development.

Implementation of the Act

3.1.7 The implementation of the Act is being progressed using a staged approach through commencement orders. To date two commencement orders have been issued which have implemented:

• the definitions within the Act;

• provisions requiring the Environment Agency and LLFAs to develop strategies for risk management,

• provisions assisting Internal Drainage Boards to operate through consortia

• power to request information

• Local Authority investigations in response to flooding incident

• Duty to maintain a flood asset register

• Miscellaneous provisions relating to local authorities, IDBs and Regional Flood Defence Committees

• powers to consent works affecting ordinary watercourses

• Regional Flood and Coastal Committees (RFCC).

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Flood Risk Regulations 2009

3.1.8 The Flood Risk Regulations came in to force on 10th December 2009. Its purpose is to transpose the EC Floods Directive (Directive 2007/60/EC on the assessment and management of flood risks) into domestic law and to implement its provisions. The regulations outline the roles and responsibilities of the various authorities consistent with the Flood and Water Management Act 2010 and provide for the delivery of the outputs required by the directive. The Regulations:

• Give responsibility to the Environment Agency to prepare Directive deliverables: preliminary flood risk assessments, flood risk maps and hazard maps and flood risk management plansfor flood risk from the sea, main rivers and reservoirs;

• Give responsibility to LLFAs to do the same for all other forms of flooding (excluding sewer flooding), including surface runoff, groundwater and ordinary watercourses;

• Require preliminary flood risk assessments (PFRA) to be prepared before 22 December 2011, with LLFAs completing their PFRA reports in Spring 2011;

• Require areas of significant risk to be identified on the basis of the preliminary flood risk assessments;

• Require flood risk maps and hazard maps for the identified areas of significant flood risk before 22 December 2013;

• Require flood risk management plans to be prepared for the areas of significant flood risk before 22 December 2015;

• Require engagement with the public and relevant authorities in the production of Directive deliverables.

3.1.9 The first step of the Flood Risk Regulations (2009) is the PFRA. The PFRA is a high level screening exercise to identify areas of most significant flood risk across Europe. The Buckinghamshire Preliminary Flood Risk Assessment was published in May 2011 and can be viewed at www.transportforbucks.net/FloodingManagement1.aspx. There are four key steps which must be undertaken as part of the PFRA:

• Assessment of past floods - the PFRA should assess past floods which had harmful consequences for human health, economic activity or the environment, or could have harmful consequences if they were to occur now;

• Assessment of future floods - the PFRA should assess the possible harmful consequences of future floods, and must take into account topography, watercourses, floodplains, defences, populated areas, economic centres and the impacts of climate change;

• Identification of ‘flood risk areas’ - the PFRA should identify ‘flood risk areas’, which are locations considered to be most significantly at risk of flooding – the Environment Agency has defined criteria for identifying ‘flood risk areas’ and has provided ‘indicative flood risk areas’ on a national basis which should be used by LLFAs when undertaking their PFRAs;

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• Preliminary assessment report - all of the information above should be captured in the preliminary assessment report, which is sent to the Environment Agency for publication.

3.1.10 In ‘Flood Risk Areas’ , both the Environment Agency and LLFAs will need to produce flood risk maps, hazard maps and flood risk management plans for their respective sources of flooding. The flood risk management plans must include objectives for managing flood risk and proposed measures for achieving those objectives, much like the requirements of the Local Flood Risk Management Strategy. The Buckinghamshire Local Strategy for the Management of Flood Risk has completed the stakeholder consultation draft stage (May 2012).

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Table 3-1 Impact of FWMA on local authorities and developers

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3.2 Strategic Flood Risk Assessment 3.2.1 The key responsibility for Planning Authorities is delivering their Strategic Flood Risk Assessment (SFRA), and in doing so ensuring that development management policies are consistent with national flood risk management policy and with the local flood risk management strategy.

3.2.2 A Level 1 SFRA was completed for the district in August 2012. This set out several settlements in the district that have areas prone to fluvial and other sources of flood risk and where development should be avoided in these areas.

3.2.3 The level 2 SFRA was completed for Aylesbury Town in February 2009 and takes forward flood modelling that was completed for the town by Peter Brett Associates.

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Flood Zone 3b (the Fluvial Flood Plain) was plotted as a 1 in 20 year flood event. The locations of existing and potential flood storage areas are shown.

3.2.4 Following the withdrawal of the Aylesbury District Core Strategy, the SFRA has been reviewed by AVDC in light of the emerging Vale of Aylesbury Plan. The district wide Level 1 SFRA was completed in August 2012. The WCS collates the information provided by the SFRA (including flood zone boundaries and sources of flooding at water services infrastructure). The conclusions of the WCS sit alongside the SFRA to inform the Vale of Aylesbury Plan. The following data sources have been mapped for each relevant settlement:

• Environment Agency Flood Zones

• Environment Agency Areas susceptible to Groundwater Flooding

• Environment Agency Flood Map for surface water

• Environment Agency Historic Flood Map

• Environment Agency National flood storage areas

• Environment Agency National areas benefiting from defences

• Environment Agency National flood defences

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4 Water services infrastructure and water companies

4.1 Legislation

4.1.1 A water company is appointed as the water and sewerage undertaker for the Anglian region through an appointment made under the Water Industry Act 1991 (see Figures 3.1 and 3.2 for the operating boundaries). The principal duties of a water and sewerage undertaker are set out in that legislation. Section 37 of that Act places a duty upon a water undertaker to develop and maintain an efficient and economical system of water supply within its area. Similarly Section 94 places a duty upon a sewerage undertaker to provide, improve and extend a system of public sewers to ensure that its area is effectually drained and the contents of those sewers effectually dealt with.

4.1.2 The two water companies that provide services in the Aylesbury Vale District are Thames Water Utilities Limited (TWUL) and Anglian Water Services (AWS) limited. Figure 4-1 and Figure 4-2 detailed the water company operating boundaries for Aylesbury Vale.

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Figure 4-1 Water company wastewater operating boundaries

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Figure 4-2 Water company water supply operating boundaries

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4.2 Regulation

4.2.1 The Water Services Regulation Authority (Ofwat) is the economic regulator of water and sewerage companies in England and Wales.

4.2.2 For every five year asset management planning (AMP) cycle, companies submit a business plan to Ofwat. The plans set out each company's view of what it needs to do to maintain its assets, improve services to customers and deal with its impact on the environment. The funding is linked to the setting of customer bills (the so-called “price review” or PR).

4.2.3 Any infrastructure requirements which arise after agreement of the five year AMP will normally be considered for the following AMP period. AMP5 will cover the period 2010 to 2015. The next review will conclude in PR14 and will set customer bills and the water company investment plans for the period 2015 – 2020, or AMP6 (see Figure 4-3 The project planning cycle).

4.3 Developer Contributions

4.3.1 When a developer wishes to proceed with a particular site, they will requisition the appropriate water company (or companies if separate for water and wastewater) to provide infrastructure in accordance with the relevant provisions of the act (Section 98 for sewerage and Section 41 for water) The cost of this is shared between the developer and undertaker in accordance with provisions of legislation. For infrastructure serving more than one development site, it is necessary to share costs equitably between developers.

4.3.2 The current system of “section 106 agreements” (of the Town and Country Planning Act) or ‘community infrastructure levy’ between planning authorities and developers is not available as a mechanism for recovering the cost of water or wastewater infrastructure. These agreements can only be used for public sector works e.g. highways, health, education, flood mitigation.

4.3.3 However, developers have a right of connection and without a planning condition in place the water company has no power to prevent connection to the networks. Under existing legislation, it is not possible to control the requisition of wastewater network infrastructure through a planning condition. Therefore, water companies will sometimes seek a Grampian Condition which requires a drainage strategy to be agreed, funded and delivered before occupation is permitted. Where a water company has identified a potential drainage issue in this strategy, Aylesbury Vale DC should consider whether the use of such Grampian Conditions is appropriate to protect existing residents from the risk of foul flooding.

4.3.4 This water cycle study has considered the site allocations developments and, together with AWS and TWUL undertaken an assessment of the feasibility of provision of infrastructure, and assessment of the scale and likely most route of funding for this infrastructure.

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Figure 4-3 The project planning cycle

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5 Water quality and wastewater treatment

5.1 Wastewater and Water quality

5.1.1 A review of water quality is required during the development process to ensure that development does not adversely affect water quality, and does not hinder the ability of a water body to meet the Water Framework Directive requirements. This overview outlines the process to assess water quality as part of the WCS.

5.1.2 The future expansion potential of a wastewater treatment works with respect to water quality is determined by assessing the Environmental Permit or Discharge Consent, set by the Environment Agency. This consent is based on the ecological sensitivity of the receiving watercourse and specifies a maximum flow and a minimum effluent quality that the WwTW has to achieve to meet water quality targets without causing environmental damage.

5.1.3 As the population connected to a wastewater treatment works increases, the amount of treated wastewater (or effluent) being discharged to the receiving water generally increases in proportion to the population increase. When this increased population causes the treatment works to exceed the consented maximum discharge volume allowed by the Environment Agency consent or permit, improvements are likely to be required to the treatment works to improve the standard of treatment and to ensure river quality does not deteriorate.

5.1.4 The quantity of treated effluent discharged from each treatment works and its quality is specified by the legal discharge consent or permit, issued by the Environment Agency under the Water Resources Act 1991 or the Environmental Permitting Regulations 2010. The consent is normally based upon the Dry Weather Flow (DWF) of the treated effluent, and typically stipulates limits for the concentration of biochemical oxygen demand (BOD), total suspended solids (TSS) and ammoniacal nitrogen (NH3), and may include limits for other substances such as metals and phosphate. Compliance is determined by means of statistical analysis of effluent quality data.

5.1.5 When new or revised discharge to consents are considered by the Environment Agency, consent limits will be set with a view to meeting the requirements of the Water Framework Directive (WFD) whose aim is to ensure that good river quality standards are met throughout each waterbody. The discharge consent limits will be based upon the quality and volume of the receiving watercourse and the volume of wastewater effluent at the point of discharge.

5.2 Water quality and wastewater treatment methodology – larger settlements 5.2.1 To assess the environmental impact of growth we have assessed the maximum number of houses likely to be connected to each WwTW to assess whether a new flow consent would be required to accommodate growth. If growth will not cause a breach of the current consented DWF then it is fair to assume that there will not be deterioration of planned water quality (that is the water quality the Environment

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Agency expects if a WwTW was discharging at its DWF and discharge consent). Even if growth will not cause breach of consented DWF at the WwTWs there may need to be tightening of discharge consents at the WwTWs to help meet the more stringent environmental standards required by the WFD. However, the purpose of the water quality assessment in a WCS is to identify where development may cause deterioration of water quality, or where growth will prevent good status being achieved.

5.2.2 A no deterioration assessment wasthen carried out. This analysis has used the Environment Agency River Quality Planning (RQP) toolkit, or simple spreadsheet calculations where water quality or river flow data were not agreed or available.

5.2.3 The no deterioration assessment calculates the BOD, ammonia and phosphate consent required at the WwTW to maintain the current WFD status with the addition of the 2026 growth flows. For this the upstream river flow and quality values and the future DWF are entered into RQP with the current WFD status (as provided by the Environment Agency) used as the target value for downstream river quality. The future consents required to meet no deterioration of status are then calculated.

5.2.4 Further to the no deterioration analysis, an assessment has been made to establish whether growth is likely to make achievement of WFD good status unfeasible. To assess this, the consents required to meet good WFD status are calculated with the current consented flows and the 2031 growth flows. The difference between these consents determines whether the growth has an impact on the ability to meet good status.

5.2.5 This analysis has also used the Environment Agency River Quality Planning (RQP) toolkit. To calculate the consent required at the WwTW to meet WFD good status the upstream river flow, agreed quality values and the current consented DWF are entered into RQP with WFD good status used as the target value for downstream river quality. The current consents required to meet WFD good status are then calculated. This process is then repeated with the 2026 growth DWF.

5.3 Water quality and wastewater treatment methodology – smaller settlements 5.3.1 The project steering group determined that it was not necessary to model the environmental capacity for wastewater discharge as part of this evidence base. It was agreed that an understanding of consented or of infrastructure capacity at each WwTW was sufficient for the purposes of this strategic assessment. For the smaller settlements we have reported the wastewater treatment works that each settlement discharges to, summarised the Water Framework Directive classification results for the waterbody that the WwTW discharges into, and identified development management policies that would be necessary to ensure that environmental capacity is not breached. This assessment does not preclude the need for more detailed water quality modelling as the Vale of Aylesbury Plan progresses.

5.4 Wastewater treatment capacity Wastewater infrastructure assessment methodology

5.4.1 Even if there is environmental, or water quality, capacity for development, it does not necessarily mean that the infrastructure capacity is available or can be viably made available. However, unlike environmental capacity, infrastructure capacity is very

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rarely an absolute constraint to development; if new infrastructure is required, subject to there being land available, funding, and time to plan and deliver new infrastructure, it can be made available. Therefore it is essential that a water cycle study consider the implications of land availability, and time to plan, fund and deliver new infrastructure to facilitate new developments.

Wastewater treatment infrastructure

5.4.2 Anglian Water and Thames Water have undertaken an assessment of the scale of infrastructure required at each of the wastewater treatment sites that may be affected by committed or allocated development. This has involved identifying:

• If and at what population threshold development will cause consented discharge to exceed the current consent

• If and at what population threshold development the water company will need to provide additional infrastructure to accommodate the growth scenario

• The scale of infrastructure that may be required

• The estimated lead time to deliver any infrastructure

• Any other issues that may impact on delivery timescale, such as the need for additional land

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6 Drainage network infrastructure

6.1 Assessment methodology 6.1.1 TWUL and AWS have provided geographical data to identify the extent of the drainage network for each sustainable settlement. Using this data, we have identified which drainage network each sustainable settlement drains to, and calculated a minimum and maximum housing scenario, based on projections provided by AVDC, for each wastewater network.

6.1.2 Using this analysis, TWUL and AWS then undertook a red, amber, green (RAG) risk assessment of wastewater and surface water network capacity. This RAG assessment is based on the water companies understanding of constraints in the local network, including the incidence of foul flooding and presence of combined sewer overflows.

6.1.3 The RAG criteria are shown in Table 6-1 below

Table 6-1 Wastewater network risk assessment criteria

Infrastructure known to be exceeded by growth scenario (s), therefore improvements will be required, infrastructure Red Infrastructure capacity exceeded with proposed growth, or no public infrastructure present Growth scenarios being tested may cause the network to exceed capacity and therefore there may be infrastructure Amber improvements required – any proposed developments/allocations must be assessed at the time. Green Capacity available to serve the proposed growth

6.1.4 For wastewater network capacity, if the constraints RAG assessment identified a red or amber risk, the water companies undertook a further assessment, which identified the potential time and mechanism for delivery of additional infrastructure to resolve the Red or Amber constraint.

6.1.5 For surface water network capacity, if the constraints RAG assessment identified a red or amber risk, then developers must consider that discharge to surface water is not an option when preparing the site drainage strategy.

6.1.6 The infrastructure delivery RAG criteria are shown in Table 6-2 below

Table 6-2 Infrastructure delivery assessment criteria

Major infrastructure extensions required to be delivered Red through business planning process. At least 5 years required to plan, fund and deliver infrastructure Minor infrastructure works likely to be able to be provided Amber through a standard requisition process. Delivery time 12 - 24 months

no infrastructure required Green

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7 Water resources and water supply

7.1 Water supply infrastructure assessment methodology

7.1.1 TWUL and AWS undertook a red, amber, green (RAG) risk assessment of water supply capacity. This RAG assessment is based on the water companies’ understanding of constraints in the local supply system, including the incidence of low pressure and supply interruptions. The RAG criteria are shown in Table 6-1 below

Table 7-1 Water supply risk assessment criteria

Infrastructure known to be exceeded by growth scenario (s), Red therefore improvements will be required Growth scenarios being tested may cause the network to exceed capacity and therefore there may be infrastructure Amber improvements required – any proposed developments/allocations must be assessed at the time. Green Capacity available to serve the proposed growth

7.1.2 If the constraints RAG assessment identified a red or amber risk, the water companies undertook a further assessment, which identified the potential time and mechanism for delivery of additional infrastructure to resolve the Red or Amber constraint. The infrastructure delivery RAG criteria are shown in Table 6-2 below.

Table 7-2 Infrastructure delivery assessment criteria

no infrastructure required Green

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8 Sustainable settlement analysis

8.1 Larger settlements in the Northern Vale market area

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8.1.1 Buckingham market sub area

Water cycle Analysis Assessment element

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Flood risk and There are significant areas of flood risk on the River Great Ouse Floodplain which surface water flows West to East through Buckingham. Any development within the management Environment Agency flood zones (see Figure C.9) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The southern and south west periphery of Buckingham is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.10).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Buckingham is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The South West periphery is an area of high permeability, and is identified as being suitable for infiltration SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited, therefore any development within the Buckingham periphery should allow enough land for attenuation storage.

Where development cannot be steered away from areas of flood risk, and sequential testing (and exception testing where required) confirms this conclusion, any development must be supported by a comprehensive Flood Risk Assessment and Drainage Strategy identifying how appropriate measures, including the development SuDS system, will protect the development, and downstream properties from all sources of flooding, including groundwater and surface water flooding.

All development, including proposals outside of any identified flood risk area will require a drainage strategy, including detailed SuDS proposals for surface water management. All development within or partly within areas of identified flood risk, or where there is documentary or anecdotal evidence of flooding, will require an FRA, and the drainage strategy can be part of this FRA. All SuDS schemes will need to comply with the National SuDS standards when they are adopted, and be approved by the SuDS approval body for any development proposals submitted after the SuDS Approval Body is inaugurated (not before Spring 2013). The Lead Local Flood Authority may adopt local SuDS standards that differ to the National SuDS standards as the Local Flood Risk Management Strategy is developed. Any development will need to confirm the presence or otherwise of locally agreed standards with the LLFA before commencing design of a SuDS or drainage system.

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Water quality Buckingham is served by Buckingham WwTW which is operated by Anglian Water environmental limits Services Limited. The smaller settlements of Akeley, Gawcott, Thornborough and and wastewater Tingewick also drain to Buckingham WwTW. treatment capacity The minimum housing growth scenario being tested through this study is 780, and the maximum is 1800. This is in addition to a total of 1055 properties that have planning permission that have not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water identify that there is no capacity in the WwTW environmental permit (or WwTW water quality consent) for development beyond that already committed.

Buckingham WwTW discharges into the River Ouse. The River Ouse is classified as a Heavily Modified Waterbody, and the current overall status is Moderate, with both Fish and Phosphate status being moderate. Ammonia and Dissolved Oxygen status are high, and the mitigation measures assessment identifies that moderate status in this waterbody by 2015 is technically infeasible.

Buckingham WwTW has 95 percentile consents of 20 for BOD, 10 for ammonia and 2 for phosphate.

The results of the no deterioration analysis show that with the additional flows from the growth at Buckingham, no change is required to the BOD consent, however, the ammonia consent will require tightening from 10 mg/l to 3 mg/l and the phosphate consent will also require tightening from 2 mg/l to 1 mg/l to prevent any deterioration in the downstream water body. This is not considered to be a constraint to growth as it is within the limits of conventionally applied wastewater technology.

The results show that to meet WFD good status with the upper projection of development flows the current BOD consent at Buckingham WwTW would require tightening from 20 mg/l to 16 mg/l., similarly the ammonia consent would require tightening from 10 mg/l to 3 mg/l. To meet good status for phosphate would require mean annual average discharge consent of 0.44 mg/l. With the current consented DWF, to meet WFD status would require a tightening of phosphate consent to 0.51mg/l. This demonstrates that before growth the phosphate consent required to achieve Good river status is already beyond the limits of conventionally applied wastewater technology and therefore should not be considered a barrier to growth.

A new permit may be required to secure consent standards that protect good ecological status as discussed above, and Anglian Water and the Environment Agency should ensure that any consent review is undertaken in a timely manner to prevent a lack of consented capacity delaying sustainable development. However, there may be more sustainable alternatives, such as wastewater network surface water reduction, that would remove the need for a consent review, and AWS are currently investigating the most sustainable option to provide consented capacity at Buckingham WwTW.

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The existing wastewater network is primarily a combined system with a number of combined sewer overflows and some properties that are subject to foul flooding. There are small areas that are separately sewered on the periphery of the urban Infrastructure feasibility extent. The existence of current service problems indicates that there are areas of the network that are under capacity. Any new development upstream of combined sewer overflows or properties at risk of foul flooding could have a negative impact Amber on the network.

However, Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

New developments must be separately sewered, with surface water not being discharged into the combined or foul system. The Flood and Water Management Act contains a provision making the right to connect to public surface water sewer conditional on the drainage system being approved by the SAB. Therefore any redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment and drainage strategy discussed above.

Anglian Water Services have undertaken a Red Amber Green Assessment for water Water supply supply and have identified that water supply network capacity for Buckingham is Network network Amber. Depending upon the location of the development some short lengths of capacity infrastructure reinforcement main maybe required within the village but as a whole there is capacity capacity for 600 properties. After 600 properties, reinforcement mains will be required depending on the number of properties. Amber

If short lengths of reinforcement main are needed, they will be delivered through an extended requisition process, and the typical time for delivery through the Infrastructure extended requisition process is 18 to 36 months. feasibility

Amber

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8.1.2 Winslow

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the floodplains of small rivers, drains surface water and tributaries that feed the Claydon Brook West of Winslow and Claydon Brook management which flows South East to South West of Winslow. Any development within the Environment Agency flood zones (see Figure C.55) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The northern and south periphery of Winslow is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.56).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Winslow is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The southern periphery is underlain by soils of medium permeability and is identified as being suitable for infiltration SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited; therefore any development within the Winslow periphery should allow enough land for attenuation storage.

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Water quality The minimum housing growth scenario being tested through this study is 280, and environmental limits the maximum is 800. This is in addition to a total of 10 properties that have and wastewater planning permission that have not yet been built. treatment capacity Initial calculations carried out following an approach agreed with Anglian Water

identify that there is capacity within the WwTW environmental permit (or WwTW water quality consent) for existing commitments and for 280 properties. This higher value of 800 properties could cause the WwTW to exceed its flow consent.

Winslow WwTW discharges into the Claydon Brook. The Claydon Brook is classified as a Heavily Modified Waterbody, and the current overall status is Moderate, with Fish, Phosphate, Ammonia and Dissolved Oxygen status unknown and to be determined. The mitigation measures assessment identifies that moderate status in this waterbody by 2015 is technically infeasible.

Winslow WwTW has 95 percentile consents of 15 for BOD, 5 for ammonia.

The results of the no deterioration analysis show that with the additional flows from the growth at Winslow, no change is required to the BOD consent, however, the ammonia consent will require tightening from 5 mg/l to 2 mg/l to prevent any deterioration in the downstream water body. This is not considered to be a constraint to growth as it is within the limits of conventionally applied wasteweater technology.

The results show that to meet WFD good status with the upper projection of development flows the current BOD consent at Winslow WwTW would require tightening from 15 mg/l to 14 mg/l., similarly the ammonia consent would require tightening from 5 mg/l to 3 mg/l. To meet good status for phosphate would require mean annual average discharge consent of 0.43 mg/l. With the current consented DWF, to meet WFD status would require a tightening of phosphate consent to 0.51mg/l. This demonstrates that the phosphate consent is already beyond the limits of conventionally applied wastewater technology and therefore cannot be considered a barrier to growth.

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There are a number of combined sewer overflows and some properties that are Amber subject to foul flooding. There are small areas that are separately sewered on the periphery of the urban extent. The absence of current service problems indicates Infrastructure feasibility that there may be capacity within the network to facilitate development without additional infrastructure, but this assessment will need to be confirmed by AWS when site specific details of development are known. AmAmberber

Anglian Water Services have undertaken a Red Amber Green Assessment for water Water supply supply and have identified that water supply network capacity for Winslow is Network network Amber. Depending upon the location of the development some short lengths of capacity infrastructure reinforcement main maybe required within the village but as a whole there is capacity capacity for 100 properties. Amber

If short lengths of reinforcement main are needed, they will be delivered through the developer requisition process, and the typical time for delivery through the Infrastructure feasibility standard requisition process is 12 to 24 months.

Amber

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8.2 Smaller settlements in the Northern Vale market area

8.2.1 Beachampton

Water cycle Analysis Assessment element

There are significant areas of flood risk on the River Great Ouse Floodplain which Flood risk and flows North West to North East of Beachampton and the feeder river which flows surface water South East to North West through the centre of Beachampton. Any development management within the Environment Agency flood zones shown in Figure C.3 will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The northern, centre and south periphery of Beachampton is more susceptible to groundwater flooding than the remainder of the periphery as shown in Figure C.4.

The SuDS potential map (Appendix E) identifies that the periphery of Beachampton is underlain by highly permeable (centre), medium permeable (North) and impermeable soils (South). The impermeable soils or strata will require land set aside for SuDS attenuation for any development within the area. The central corridor which spans from east to west is of high permeability soils and is identified as being suitable for infiltration SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited; therefore any development within the Beachampton periphery should allow enough land for attenuation storage.

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SuDS standards as the Local Flood Risk Management Strategy is developed. Any development will need to confirm the presence or otherwise of locally agreed standards with the LLFA before commencing design of a SuDS or drainage system.

Water quality Beachampton is served by Beachampton WwTW which is operated by Anglian environmental limits Water Services Limited. This WwTW serves the Beachampton town and and wastewater surrounding areas. treatment capacity The minimum housing allocation being tested through this study is 20 and the maximum is 100. This is in addition to one property that has planning permission yet to be built.

Beachampton WwTW discharges into the Beachampton Brook. The Beachampton Brook is classified as a Heavily Modified Waterbody. The current overall status is Moderate, with Fish status unknown and Phosphate status being moderate. Ammonia and Dissolved Oxygen status is high, and the mitigation measures assessment identifies that good status in this waterbody by 2015 is technically infeasible.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network settlement, and have identified that network capacity in this settlement is Amber, capacity and that the ability to provide additional infrastructure if required is Amber. Amber There is no history or foul flooding in Beachampton, and there are no combined sewer overflows. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are infrastructure and management options that could be implemented for the scale of Amber development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Beachampton is capacity infrastructure Green. Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is Green capacity for 100 properties. If short lengths of reinforcement main are needed, they will be delivered through the developer requisition process, and the typical time for

delivery through the standard requisition process is 12 to 24 months.

8.2.2 Akeley

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Great Ouse tributary surface water floodplain on the North East of Akeley. Any development within the Environment management Agency flood zones (see Figure C.1) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North East and South peripheries of Akeley are more susceptible to groundwater flooding than the remainder of the periphery. (See Figure C.2).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Akeley is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. Any development within the Akeley periphery should allow enough land for attenuation storage.

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and Drainage Strategy identifying how appropriate measures, including the development SuDS system, will protect the development, and downstream properties from all sources of flooding, including groundwater and surface water flooding.

Water quality Akeley is served by Buckingham WwTW which is operated by Anglian Water environmental limits Services Limited. The other settlements served by the Buckingham WwTW include and wastewater Buckingham, Gawcott, Thornborough and Tingewick. treatment capacity The minimum housing growth scenario being tested through this study is 780, and the maximum is 1800. This is in addition to a total of 1055 properties that have planning permission that have not yet been built.

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Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure settlement, and have identified that network capacity in this settlement is Amber, capacity capacity and that the ability to provide additional infrastructure if required is Amber. Amber The existing wastewater network is a combined system with one intermittent discharge point with no history of flooding. Anglian Water have advised that Akeley Pumping station is likely to need upgrading, but this will be required Infrastructure feasibility irrespective of the number of properties delivered. Amber Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are infrastructure and management options that could be implemented for the scale of

development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Akeley is capacity infrastructure Amber. Depending upon the location of the development some short lengths of <50 properties capacity reinforcement main maybe required within the village but as a whole there is capacity for 50 properties. After 50 properties reinforcement mains will be required Green depending on the number of properties.

If short lengths of reinforcement main are needed, they will be delivered through >50 properties the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months. Amber

Infrastructure feasibility

Amber

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8.2.3 Gawcott

Water cycle element Analysis Assessment

Flood risk and surface There are no significant areas of river flood risk within the periphery of water management Gawcott.

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The Gawcott town central corridor from East to West is more susceptible to groundwater flooding than the remainder of the periphery (Figure C.18).

The SuDS potential map (Appendix E) (Appendix E) identifies that the majority of the periphery of Gawcott is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The identification of this area as susceptible to groundwater flooding also means that there are no opportunities for infiltration SuDS, therefore any development within the Gawcott periphery should allow enough land for attenuation storage.

Anglian water have identified that there is no public surface water system within Gawcott.

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Water quality Gawcott is served by Buckingham WwTW which is operated by Anglian Water environmental limits Services Limited. The other settlements served by the Buckingham WwTW and wastewater include Buckingham, Akeley, Thornborough and Tingewick. treatment capacity The minimum housing growth scenario being tested through this study is 780, and the maximum is 1800. This is in addition to a total of 1055 properties that have planning permission that have not yet been built.

Buckingham WwTW discharges into the River Ouse. The River Ouse is classified as a Heavily Modified Waterbody. The current overall status is Moderate, with both Fish and Phosphate status being moderate. Ammonia and Dissolved Oxygen status are high, and the mitigation measures assessment identifies that moderate status in this waterbody by 2015 is technically infeasible.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for Network infrastructure capacity this settlement, and have identified that network capacity in this settlement is capacity Amber, and that the ability to provide additional infrastructure if required is Amber. Amber

The existing wastewater network is a combined system with one intermittent discharge point and with no history of flooding. Infrastructure feasibility

Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are Amber infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a

development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water supply network Anglian Water Services have undertaken a Red Amber Green Assessment for Network infrastructure capacity water supply and have identified that water supply network capacity for capacity Gawcott is Amber. Depending upon the location of the development some short <15 properties lengths of reinforcement main maybe required within the village but as a whole there is capacity for 15 properties. After 15 properties reinforcement mains will Green be required depending on the number of properties. >

If short lengths of reinforcement main are needed, they will be delivered >15 properties through the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months. Amber

Infrastructure feasibility

Amber

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8.2.4 Thornborough

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the Padbury Brook tributaries surface water floodplains which flow from East to West through the centre of Thornborough. management Any development within the Environment Agency flood zones (see Figure C.49) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent which follows the River across the town. Anglian Water have identified theyhave no surface water sewer assets in Thornborough. The Eastern and Western periphery of Thornborough is more susceptible to groundwater flooding than the remainder of the periphery (Figure C.50).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Thornborough is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The area from North East to South West is an area of medium and high permeability and is identified as being suitable for infiltration SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited; therefore any development within the Thornborough periphery should allow enough land for attenuation storage.

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development will need to confirm the presence or otherwise of locally agreed standards with the LLFA before commencing design of a SuDS or drainage system.

Water quality Thornborough is served by Buckingham WwTW which is operated by Anglian environmental limits Water Services Limited. The other settlements served by the Buckingham WwTW and wastewater include Buckingham, Gawcott, Akeley and Tingewick. treatment capacity The minimum housing growth scenario being tested through this study is 780, and the maximum is 1800. This is in addition to a total of 1055 properties that have planning permission that have not yet been built.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure settlement, and have identified that network capacity in this settlement is Amber, capacity capacity and that the ability to provide additional infrastructure if required is Amber. Amber The existing wastewater network is a combined system with one intermittent discharge point and with no history of flooding. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are Amber infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to

be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Anglian Water Services have undertaken a Red Amber Green Assessment for water Water supply supply and have identified that water supply network capacity for Thorborough is Network network Green. Depending upon the location of the development some short lengths of capacity infrastructure reinforcement main maybe required within the village but as a whole there is capacity capacity for all of the development properties. Green

If short lengths of reinforcement main are needed, they will be delivered through the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months.

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8.2.5 Tingewick

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Great Ouse tributaries surface water floodplains which flows from North to South on the East and West periphery of management Tingewick. Any development within the Environment Agency flood zones (see Figure C.53) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. Anglian Water have identified that there is a public surface water system that covers about 90% of the extent of the urban area. The Tingewick town central corridor from East to West is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.54).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Tingewick is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The North East to West corridor is underlain by soils of medium permeability and is identified as being suitable for infiltration SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited; therefore any development within the Tingewick periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Tingewick is served by Buckingham WwTW which is operated by Anglian Water environmental limits Services Limited. The other settlements served by the Buckingham WwTW include and wastewater Buckingham, Gawcott, Thornborough and Akeley. treatment capacity The minimum housing allocation being tested through this study is 780, and the maximum is 1800. This is in addition to a total of 1055 properties that have planning permission that have not yet been built.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure settlement, and have identified that network capacity in this settlement is Amber, capacity capacity and that the ability to provide additional infrastructure if required is Amber. Amber The existing wastewater network is a combined system with one intermittent discharge point and with no history of flooding. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are Amber infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to

be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Tingewick is capacity infrastructure Amber. Depending upon the location of the development some short lengths of <100 properties capacity reinforcement main maybe required within the village but as a whole there is capacity for 100 properties. After 100 properties reinforcement mains will be Green required depending on the number of properties.

If short lengths of reinforcement main are needed, they will be delivered through >100 properties the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months. Amber

Infrastructure feasibility

Amber

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8.2.6 Chackmore

Water cycle Analysis Assessment element

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Flood risk and There are significant areas of flood risk on the River Great Ouse tributaries surface water floodplains which flows from North to South on the south periphery of Chackmore. management Any development within the Environment Agency flood zones (see Figure C.7) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The East periphery of Chackmore is more susceptible to groundwater flooding than the remainder of the periphery (See Figure C.8).

Anglian Water have identified that there is no public surface water sewer system in Chackmore.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Chackmorek is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The identification of this area as susceptible to groundwater flooding also means that opportunities for infiltration SuDS are limited; therefore any development within the Chackmore periphery should allow enough land for attenuation storage.

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Water quality Chackmore is served by Chackmore WwTW which is operated by Anglian Water environmental limits Services Limited. The Radclive settlement also drains to Chackmore WwTW. and wastewater treatment capacity The minimum housing allocation being tested through this study is 40 and the maximum is 200. This is in addition to a total of three properties that have

planning permission that have not yet been built.

Chackmore WwTW is a small WwTW with a descriptive consent. As the WwTW is a small WwTW, a large development is likely to have a disproportionately high impact on the WwTW, and it is likely that significant WwTW improvements will

need to be delivered through the business planning process. Further assessment Red will need to be undertaken by AWS to confirm exactly what the infrastructure impact would be, and whether this impact should be considered as part of a viability assessment of development in this settlement.

Chackmore WwTW discharges into an unclassified tributary of the River Ouse. The River Ouse is classified as a Heavily Modified Waterbody, and the current overall status is Moderate, with both Fish and Phosphate status being moderate. Ammonia and Dissolved Oxygen status are high, and the mitigation measures assessment identifies that moderate status in this waterbody by 2015 is technically infeasible.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure settlement, and have identified that network capacity in this settlement is Red, and capacity capacity that the ability to provide additional infrastructure if required is Amber. Not assessed There is a public sewerage network in Chackmore, but a RAG assessment has not been provided by Anglian Water Services. Infrastructure feasibility New developments must be separately sewered, with surface water not being discharged into the combined or foul system. The Flood and Water Management Not Act contains a provision making the right to connect to public surface water sewer assessed conditional on the drainage system being approved by the SAB. Therefore any redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment and drainage strategy discussed above.

Anglian Water Services have undertaken a Red Amber Green Assessment for water Water supply supply and have identified that water supply network capacity for Chackmore is Network network Green. Depending upon the location of the development some short lengths of capacity infrastructure reinforcement main maybe required within the village but as a whole there is capacity capacity for the development. Green

If short lengths of reinforcement main are needed, they will be delivered through

the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months.

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8.2.7 Radclive

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Great Ouse and its tributaries surface water Floodplain which flows from West to East through the central corridor of Radclive. management Any development within the Environment Agency flood zones (see Figures C.39) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The Radclive town central corridor from East to West is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.40).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Radclive is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The South East to West corridor is underlain by soils of medium and high permeability and is identified as being suitable for infiltration SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited; therefore any development within the Radclive periphery should allow enough land for attenuation storage.

Anglian Water have identified that they have no surface water sewer system in Radclive.

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Water quality There is no public sewerage system or wastewater treatment works in Radclive. environmental limits There may be opportunities to combine development with a first time rural and wastewater sewerage scheme (Section 101a under the Water Industry Act) if there are known Red treatment capacity environmental issues caused by the lack of a sewerage system in Radclive. However, the requirements for Section 101a schemes require a rigourous cost benefit appraisal, and the schemes must meet strict requirements that are only met in the most severe cases of environmental impact.

New developments must be separately sewered, with surface water not being Infrastructure feasibility discharged into the combined or foul system. The Flood and Water Management Act contains a provision making the right to connect to public surface water sewer Amber conditional on the drainage system being approved by the SAB. Therefore any redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment and drainage strategy discussed above.

Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Radclive is capacity infrastructure Amber. Depending upon the location of the development some short lengths of <50 properties capacity reinforcement main maybe required within the village but as a whole there is capacity for 50 properties. After 50 properties reinforcement mains will be required Green depending on the number of properties.

Infrastructure feasibility

Amber

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8.2.8 Newton Longeville

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Ouzel tributaries Floodplain on surface water the West to North and South East periphery of Newton Longville. Any management development within the Environment Agency flood zones (see Figure C.35) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North West corridor is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.36).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Newton Longville is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. Any development within the Newton Longville periphery should allow enough land for attenuation storage. Anglian Water have identified that approximately 75% of the urban extent is separately sewered, and that there are no known issues with the system.

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after the SuDS Approval Body is inaugurated (not before Spring 2013). The Lead Local Flood Authority may adopt local SuDS standards that differ to the National SuDS standards as the Local Flood Risk Management Strategy is developed. Any development will need to confirm the presence or otherwise of locally agreed standards with the LLFA before commencing design of a SuDS or drainage system.

Water quality Newton Longville is served by Cotton Valley WwTW which is operated by Anglian environmental limits Water Services Limited. Cotton Valley is a large WwTW serving the Milton and wastewater Keynes area. The impact of development of this scale on Cotton Valley WwTW is treatment capacity negligible

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure settlement, and have identified that network capacity in this settlement is Amber, capacity capacity and that the ability to provide additional infrastructure if required is Amber. Amber The exiting wastewater network is a combined system with one intermittent discharge point and with no history of flooding. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are Amber infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Newton capacity infrastructure Longeville is Amber. Depending upon the location of the development some short <20 properties capacity lengths of reinforcement main maybe required within the village but as a whole there is capacity for 20 properties. After 20 properties reinforcement mains will be Green required depending on the number of properties.

If short lengths of reinforcement main are needed, they will be delivered through >20 properties the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months. Amber

Infrastructure feasibility

Amber

8.2.9 Drayton Parslow

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Ouzel’s tributary floodplain surface water which flows from the South West to North East on the North East periphery of management Drayton Parslow. Any development within the Environment Agency flood zones (see Figure C.13) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The East and North peripheries are more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.14).

Anglian Water have identified that there is no public surface water sewer system in Drayton Parslow

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The SuDS potential map (Appendix E) identifies that the majority of the periphery of Drayton Parslow is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The West is underlain by soils of medium permeability and is identified as being suitable for infiltration SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Drayton Parslow periphery should allow enough land for attenuation storage.

Water quality Drayton Parslow is served by Drayton Parslow WwTW which is operated by environmental limits Anglian Water Services Limited. and wastewater treatment capacity The minimum housing allocation being tested through this study is 20 and the maximum is 100. This is in addition to a total of six properties that have planning permission that have not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water identify that there is capacity within the WwTW environmental permit (or WwTW water quality consent) for existing commitments and for 20 properties. This higher value of 100 properties could cause the WwTW to exceed its flow consent.

The wastewater treatment works discharges to a Tributary of the River Ouzel, which is classified as a Heavily Modified Waterbody, and has a current overall status of Moderate, with Fish status being moderate. Phosphate, Ammonia and Dissolved Oxygen status are not known and to be determined and the mitigation measures assessment identifies that good status in this waterbody by 2015 is technically infeasible.

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Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure settlement, and have identified that network capacity in this settlement is Amber, capacity capacity and that the ability to provide additional infrastructure if required is Amber. Amber There is no history or foul flooding in Drayton Parslow, and there are no combined sewer overflows. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are Amber infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Drayton capacity infrastructure Parslow is Green. Depending upon the location of the development some short capacity lengths of reinforcement main maybe required within the village but as a whole Green there is capacity for 100 properties.

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8.2.10 Great Horwood

Water cycle Analysis Assessment element

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Flood risk and There are significant areas of flood risk on the Claydon Brook tributaries on the surface water South and West periphery of Great Horwood. Any development within the management Environment Agency flood zones (see Figure C.21) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North and South East peripheries of Great Horwood are more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.22).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Great Horwood is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. Any development within the Great Horwood periphery should allow enough land for attenuation storage. Anglian Water have identified that there is no public surface water sewer system serving Great Horwood.

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Water quality Great Horwood is served by Great Horwood WwTW which is operated by Anglian environmental limits Water Services Limited. The Great Horwood WwTW also serves the Little and wastewater Horwood settlement. treatment capacity The minimum housing allocation being tested at Great Horwood WwTW through this study is 40 and the maximum is 200. This is in addition to a total of nine properties that have planning permission that have not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water identify that there is capacity in the WwTW environmental permit (or WwTW water quality consent) for committed development and the higher number of properties being tested.

Great Horwood WwTW discharges into a tributary of the River Horwood. The waterbody is classified as a Heavily Modified Waterbody and therefore must achieve good ecological potential. The current overall status of this waterbody is Good.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure settlement, and have identified that network capacity in this settlement is Amber, capacity capacity and that the ability to provide additional infrastructure if required is Amber. Amber There is no history or foul flooding in Great Horwood, and there are no combined sewer overflows. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are Amber infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Great Horwood capacity infrastructure is Green. Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is Green capacity for 100 properties.

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8.2.11 Little Horwood

Water cycle Analysis Assessment element

There are significant areas of flood risk on the Claydon Brook tributary which flows Flood risk and from East to West on the West periphery of Little Horwood. Any development surface water within the Environment Agency flood zones (see Figure C.25) will be subject to a management sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The town central North East to South West and South corridors of Little Horwood are more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.26).

Anglian Water has identified that there is no public surface water sewer network in Little Horwood.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Little Horwood is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. There are pockets underlain by soils of medium permeability soils on the North and East peripheries identified as being suitable for infiltration SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited; therefore any development within the Little Horwood periphery should allow enough land for attenuation storage.

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Water quality Little Horwood is served by Great Horwood WwTW which is operated by Anglian environmental limits Water Services Limited. The Great Horwood WwTW also serves the Gheat and wastewater Horwood settlement. treatment capacity The minimum housing allocation being tested at Great Horwood WwTW through this study is 40 and the maximum is 200. This is in addition to a total of nine properties that have planning permission that have not yet been built. Green

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure settlement, and have identified that network capacity in this settlement is Amber, capacity capacity and that the ability to provide additional infrastructure if required is Amber. Amber There is no history or foul flooding in Little Horwood, and there are no combined sewer overflows. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are infrastructure and management options that could be implemented for the scale of Amber development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Little Horwood capacity infrastructure is Green. Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is Green capacity for 100 properties.

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8.2.12 Hillesden

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the Claydon Brook and its tributary’s surface water Floodplain on the West and East periphery of Hillesden. Any development within management the Environment Agency flood zones (see Figure C.23) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The west periphery of Hillesden is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.24).

Anglian Water has identified that there is no public surface water sewer network serving Hillesden

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Hillesden is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. Any development within the Hillesden periphery should allow enough land for attenuation storage.

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Water quality Hillesden is served by Hillesden-Church End WwTW which is operated by Anglian environmental limits Water Services Limited. and wastewater treatment capacity The minimum housing allocation being tested through this study is 20 and the maximum is 100. This is in addition to a total of three properties that have planning permission that have not yet been built.

Hillesden Church End WwTW is a small WwTW with a descriptive consent. As the WwTW is a small WwTW, a large development is likely to have a disproportionately high impact on the WwTW, and it is likely that significant Red WwTW improvements will need to be delivered through the business planning process. Further assessment will need to be undertaken by AWS to confirm exactly what the infrastructure impact would be, and whether this impact should be considered as part of a viability assessment of development in this settlement.

Hillesden-Church End WwTW discharges into the Padbury Brook (The Twins). The Padbury Brook (The Twins) is classified as a Heavily Modified Waterbody, and the current overall status is Moderate with Phosphate being the cause of the moderate status. Ammonia and Dissolved Oxygen status are high.

Anglian Water Services have undertaken a Red Amber Green Assessment for this Wastewater network settlement, and have identified that network capacity in this settlement is Amber, Network infrastructure and that the ability to provide additional infrastructure if required is Amber. capacity capacity

There is no history or foul flooding in Hillesden, and there are no combined sewer Amber overflows.

Anglian Water do not consider that wastewater network capacity should be a Infrastructure feasibility material strategic planning decision at this stage, and consider that there are infrastructure and management options that could be implemented for the scale of Amber development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Hillesden is capacity infrastructure Green. Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is Green capacity for 100 properties.

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8.2.13 Thornton

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Great Ouse which flows West surface water to North East on the periphery of Thornton. Any development within the management Environment Agency flood zones (see Figure C.51) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The town central corridor and North periphery of Thornton are more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.52).

Anglian Water have identified that there is no public surface water sewer system serving Thornton.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Thornton is underlain by high and medium permeable soils which allow infiltration SuDS for any development. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Thornton periphery should allow enough land for attenuation storage. There are also impermeable soils or strata on the southern and northern peripheries of Thornton and that any development will require land set aside for SuDS attenuation.

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Water quality There is no public sewerage system or wastewater treatment works in Thornton. Red environmental limits There may be opportunities to combine development with a first time rural and wastewater sewerage scheme (Section 101a under the Water Industry Act) if there are known treatment capacity environmental issues caused by the lack of a sewerage system in Thornton However, the requirements for Section 101a schemes require a rigourous cost benefit appraisal, and the schemes must meet strict requirements that are only met in the most severe cases of environmental impact.

Anglian Water Services have undertaken a Red Amber Green Assessment for this Wastewater network settlement, and have identified that network capacity in this settlement is Red, and Network infrastructure that the ability to provide additional infrastructure if required is Amber. capacity capacity

Anglian Water do not consider that wastewater network capacity should be a Red material strategic planning decision at this stage, and consider that there are infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development Infrastructure feasibility of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe Amber for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Thornton is capacity infrastructure Amber. Depending upon the location of the development some short lengths of <25 properties capacity reinforcement main maybe required within the village but as a whole there is capacity for 25 properties. After 25 properties reinforcement mains will be required Green depending on the number of properties.

If short lengths of reinforcement main are needed, they will be delivered through >25 properties the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months. Amber

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8.2.14 Middle Claydon

Water cycle Analysis Assessment element

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Flood risk and There are significant areas of flood risk on the Padbury Brook tributary which flows surface water from South to North on the North periphery of Middle Claydon. Any development management within the Environment Agency flood zones (see Figure C.29) will need to be subject to the requirements of PPS25 and be subject to a sequential testing and then possibly further exception testing. will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The East and North periphery of Middle Claydon is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.30).

Anglian Water has advised that there is no public surface water sewer system serving Middle Claydon.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Middle Claydon is underlain by impermeable soils or strata on the North and South peripheries of Middle Claydon and that any development will require land set aside for SuDS attenuation.

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Water quality Middle Claydon is served by Middle Claydon WwTW which is operated by environmental limits Anglian Water Services Limited. and wastewater treatment capacity The minimum housing allocation being tested through this study is 20 and the maximum is 100. There are additional properties that have planning permission that have to be built.

Middle Claydon WwTW is a small WwTW with a descriptive consent. As the WwTW is small, a large development is likely to have a disproportionately high Red impact on the WwTW infrastructure, and it is likely that WwTW improvements will need to be delivered through the business planning process. Further assessment will need to be undertaken by AWS to confirm exactly what the infrastructure impact would be, and whether this impact should be considered as part of a viability assessment of development in this settlement.

Middle Claydon WwTW discharges into the River Twin. The River Twin is classified as a Heavily Modified Waterbody and the current overall status is Good. The Ammonia and Dissolved Oxygen status are classified as high and Phosphate status is Good.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure settlement, and have identified that network capacity in this settlement is Amber, capacity capacity and that the ability to provide additional infrastructure if required is Amber. Amber There is no history or foul flooding in Middle Claydon, and there are no combined sewer overflows. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are Amber infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Middle Claydon capacity infrastructure is Amber. Depending upon the location of the development some short lengths of <25 properties capacity reinforcement main maybe required within the village but as a whole there is capacity for 25 properties. After 25 properties reinforcement mains will be required Green depending on the number of properties.

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8.2.15 Chetwode

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the Padbury Brook tributaries which surface water flow from North to South on the Chetwode East and West periphery. Any management development within the Environment Agency flood zones (see Figure C.11) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The East periphery of Chetwode is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.12).

Anglian Water have identified that there is no public sewerage system in Chetwode, neither foul, combined nor surface.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Chetwode is underlain by impermeable soils or strata and any development will require land set aside for SuDS attenuation. Any development within the Chetwode periphery should allow enough land for attenuation storage.

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There is no public sewerage system or wastewater treatment works in Chetwode. Water quality There may be opportunities to combine development with a first time rural environmental limits sewerage scheme (Section 101a under the Water Industry Act) if there are known and wastewater environmental issues caused by the lack of a sewerage system in Chetwode. treatment capacity However, the requirements for Section 101a schemes require a rigourous cost benefit appraisal, and the schemes must meet strict requirements that are only met in the most severe cases of environmental impact.

There is no public sewer system in Chetwode. Anglian Water Services have Wastewater network undertaken a Red Amber Green Assessment for this settlement, and have identified Network infrastructure that network capacity in this settlement is Red because of the lack of a public capacity capacity sewerage system, but that the ability to provide additional infrastructure if required is Amber. Red

Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are Infrastructure feasibility infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development Amber of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Chetwode is capacity infrastructure Amber. Depending upon the location of the development some short lengths of <<50 properties capacity reinforcement main maybe required within the village but as a whole there is capacity for 50 properties. After 50 properties reinforcement mains will be required Green depending on the number of properties. >50 properties

If short lengths of reinforcement main are needed, they will be delivered through the developer requisition process, and the typical time for delivery through the Amber standard requisition process is 12 to 24 months.

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8.2.16 Padbury

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Padbury Brook (The Twins) surface water Floodplain which flows South to North on the West periphery of Padbury. Any management development within the Environment Agency flood zones (see Figure C.37) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The West periphery of Padbury is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.38). Anglian Water have identified that is no public surface water sewerage system serving Padbury.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Padbury is underlain by impermeable soils or strata on the North and South peripheries and any development will require land set aside for SuDS attenuation.

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Water cycle Analysis Assessment element

Water quality Padbury is served by Padbury WwTW which is operated by Anglian Water environmental limits Services Limited. and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 20 and Amber the maximum is 100. This is in addition to a total of two properties that have planning permission that have not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water identify that there is capacity within the WwTW environmental permit (or WwTW water quality consent) for existing commitments and for 20 properties. The higher value of 100 properties could cause the WwTW to exceed its flow consent.

Padbury WwTW discharges into the Padbury Brook. The Padbury Brook is classified as a Heavily Modified Waterbody. The current overall status is Moderate, with Phosphate status being poor. Ammonia and Dissolved Oxygen status are high. The target status for 2015 is good, and a number of mitigation measures have been identified in the RBGMP for this waterbody to ensure that good status can be achieved.

There is no history or foul flooding in Padbury, and there are no combined sewer overflows. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are Amber infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Padbury is capacity infrastructure Green. Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is capacity for 100 properties.

If short lengths of reinforcement main are needed, they will be delivered through Green the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months.

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8.2.17 Calvert Green

Water cycle element Analysis Assessment

Flood risk and surface There are no significant areas of flood risk in the periphery of Calvert Green (see water management Figure C.5). Any development will not be subjected to the requirements of PPS25 and sequential testing.

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North East periphery of Calvert Green is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.6).

Anglian Water has advised that there is a public surface water sewer in Calvert Green, and that there are no known issues with the system.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Calvert Green is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. Any development within the Calvert Green periphery should allow enough land for attenuation storage.

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Water quality Calvert Green is served by Steeple Claydon WwTW which is operated by environmental limits Anglian Water Services Limited. The Steeple Claydon WwTW also serves the and wastewater Steeple Claydon settlement. treatment capacity The minimum housing growth scenario being tested through this study is 40 and the maximum is 200. This is in addition to a total of two properties that have planning permission that have not yet been built.

Flow data was not provided by AWS therefore it has not been possible to determine if there is consented capacity for new development. However, AWS state that the wastewater infrastructure RAG assessment is amber.

Steeple Claydon WwTW discharges into the Padbury Brook. The Padbury Brook is classified as a Heavily Modified Waterbody, and the current overall status is Moderate, with Phosphate status being poor. Ammonia and Dissolved Oxygen status are high. The target status for 2015 is good, and a number of mitigation measures have been identified in the RBMP for this waterbody to ensure that good status can be achieved.

Anglian Water Services have undertaken a Red Amber Green Assessment for Wastewater network this settlement, and have identified that network capacity in this settlement is Network infrastructure capacity Amber, and that the ability to provide additional infrastructure if required is capacity Amber. Amber There is no history or foul flooding in Calvert Green, and there are is a combined sewer overflow on the system. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a Amber development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water cycle element Analysis Assessment

Water supply network Anglian Water Services have undertaken a Red Amber Green Assessment for Network infrastructure capacity water supply and have identified that water supply network capacity for capacity Calvert Green is Amber. Depending upon the location of the development some <<25 properties short lengths of reinforcement main maybe required within the village but as a whole there is capacity for 25 properties. After 25 properties reinforcement Green mains will be required depending on the number of properties. >>25 properties

If short lengths of reinforcement main are needed, they will be delivered through the developer requisition process, and the typical time for delivery Amber through the standard requisition process is 12 to 24 months.

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8.2.18 Steeple Claydon

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the Padbury Brook Floodplain which surface water flows from South to North on the West periphery of Steeple Claydon. Any management development within the Environment Agency flood zones (see Figure C.41) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The West periphery of Steeple Claydon is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.42).

Anglian Water has identified that les than 5% of the area of Steeple Claydon is served by a public surface water sewer.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Steeple Claydon is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The central corridor of Steeple Claydon has medium permeability soils which allow for infiltration SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Steeple Claydon periphery should allow enough land for attenuation storage.

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Water quality Steeple Claydon is served by Steeple Claydon WwTW which is operated by environmental limits Anglian Water Services Limited. The Steeple Claydon WwTW also serves the and wastewater Calvert Green settlement. treatment capacity The minimum housing growth scenario being tested through this study is 40 and the maximum is 200. This is in addition to a total of two properties that have planning permission that have not yet been built.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure settlement, and have identified that network capacity in this settlement is Amber, capacity capacity and that the ability to provide additional infrastructure if required is Amber. Amber There is no history or foul flooding in Steeple Claydon, and there is one combined sewer overflow. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are Amber infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Steeple Claydon capacity infrastructure is Amber. Depending upon the location of the development some short lengths of <<25 properties capacity reinforcement main maybe required within the village but as a whole there is capacity for 25 properties. After 25 properties reinforcement mains will be required Green depending on the number of properties. >>25 properties

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8.2.19 Stowe

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Great Ouse tributary surface water Floodplain which flows from South to North on the West periphery of Stowe. Any management development within the Environment Agency flood zones (see Figure C.45) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The West and South periphery of Stowe is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.46).

Anglian Water has identified that there is no public surface water sewerage system serving Stowe.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Stowe is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation.

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Water cycle Analysis Assessment element

Water quality Stowe is served by Stowe WwTW which is operated by Anglian Water Services environmental limits Limited. and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 20, and Green the maximum is 100. This is an addition number to the three properties that have planning permission that have yet to be built.

Stowe WwTW discharges into an unclassified tributary of the River Ouse (Beds). The River Ouse (Beds) is classified as an Artificial Waterbody, and the current overall status is Moderate. Ammonia and Dissolved Oxygen current status are High and the Phosphate status is good. The mitigation measures assessment identifies that moderate good status in this waterbody by 2015 is technically infeasible.

Anglian Water do not consider that wastewater network capacity should be a Red material strategic planning decision at this stage, and consider that there are infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development Infrastructure feasibility of the scale identified. Amber Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

Anglian Water Services have undertaken a Red Amber Green Assessment for water Water supply supply and have identified that water supply network capacity for Stowe is Green. Network network Depending upon the location of the development some short lengths of capacity infrastructure reinforcement main maybe required within the village but as a whole there is <<25 properties capacity capacity for 100 properties. If short lengths of reinforcement main are needed, they will be delivered through Green the developer requisition process, and the typical time for delivery through the

standard requisition process is 12 to 24 months.

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8.2.20 Mursley

Water cycle element Analysis Assessment

Flood risk and surface There are no significant areas of flood risk in the periphery of Mursley (see water management Figure C.31).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The central and southern periphery of Mursley is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.32).

Anglian Water have identified that there is no public surface water sewer system in Mursley.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Mursley is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited; therefore any development within the Mursley periphery should allow enough land for attenuation storage. The outer periphery of Mursley is identified as impermeable soils or strata and that any development will require land set aside for SuDS attenuation.

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Water cycle element Analysis Assessment

Water quality Mursley is served by Swanbourne WwTW which is operated by Anglian Water environmental limits Services Limited. The other settlement served by the Swanbourne WwTW is and wastewater Swanbourne. treatment capacity The minimum housing growth scenario being tested through this study is 40, and the maximum is 200. This is in addition to a total of 14 properties that have planning permission that have not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water identify that there is capacity within the WwTW environmental permit (or WwTW water quality consent) for existing commitments and for 40 properties. This higher value of 200 properties could cause the WwTW to exceed its flow consent.

Swanbourne WwTW discharges into the Claydon Brook. The Claydon Brook is classified as a Heavily Modified Waterbody, and the current overall status is Good, with Fish status unknown, Ammonia status high and both Phosphate and Dissolved Oxygen current status good.

There is no history or foul flooding in Mursley, and there are no combined sewer overflows. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a Amber material strategic planning decision at this stage, and consider that there are infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water cycle element Analysis Assessment

Water supply network Anglian Water Services have undertaken a Red Amber Green Assessment for infrastructure capacity water supply and have identified that water supply network capacity for Network Mursley is Green. Depending upon the location of the development some short capacity lengths of reinforcement main maybe required within the village but as a whole there is capacity for 100 properties. If short lengths of reinforcement main are needed, they will be delivered through the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 Green months.

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8.2.21 Swanbourne

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the Claydon Brook Floodplain and surface water tributary which flows from East to West on the South periphery of Swanbourne. management Any development within the Environment Agency flood zones (see Figure C.47) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The East periphery of Swanbourne is less susceptible to groundwater flooding than the remainder of the periphery (see Figure C.48).

Anglian Water have identified that there is no public surface water sewer system in Swanbourne.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Swanbourne is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. There are pockets of areas underlain by permeable soil and are identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Swanbourne periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Swanbourne is served by Swanbourne WwTW which is operated by Anglian Water environmental limits Services Limited. The other settlement served by the Swanbourne WwTW is and wastewater Mursley. treatment capacity The minimum housing growth scenario being tested through this study is 40, and the maximum is 200. This is in addition to a total of 14 properties that have planning permission that have not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water identify that there is capacity within the WwTW environmental permit (or WwTW water quality consent) for existing commitments and for 40 properties. This higher value of 200 properties could cause the WwTW to exceed its flow consent.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure settlement, and have identified that network capacity in this settlement is Amber, capacity capacity and that the ability to provide additional infrastructure if required is Amber. Amber There is no history or foul flooding in Swanbourne, and there are no combined sewer overflows. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are Amber infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water cycle Analysis Assessment element

Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Swanbourne is capacity infrastructure Green. Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is capacity for 100 properties. If short lengths of reinforcement main are needed, they Green will be delivered through the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months.

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8.2.22 Nash

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Great Ouse tributary surface water Floodplain on the North West periphery of Nash. Any development within the management Environment Agency flood zones (see Figure C.33) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North West and South East periphery of Nash are less susceptible to groundwater flooding than the remainder of the periphery (see Figure C.34).

Anglian Water have identified that there is no public surface water sewer system in Nash.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Nash is underlain by impermeable soils or strata and that any development in the periphery of Nash will require land set aside for SuDS attenuation.

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Water cycle Analysis Assessment element

Water quality Nash is served by Whaddon WwTW which is operated by Anglian Water Services environmental limits Limited. and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 20, and the maximum is 100. This is an addition number to the six properties that have planning permission and yet to be built.

Whaddon WwTW discharges into the Weald Brook. The Weald Brook is classified as a Heavily Modified Waterbody, and the current overall status is Good. Ammonia and Dissolved Oxygen current status are High and the Phosphate status is good.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure settlement, and have identified that network capacity in this settlement is Amber, capacity capacity and that the ability to provide additional infrastructure if required is Amber. Amber There is no history or foul flooding in Nash, and there are four combined sewer overflows. Any development could have a negative impact on water quality if development is upstream of these overflows. This will need to be investigated Infrastructure feasibility when exact development locations are known. Amber Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water cycle Analysis Assessment element

Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Nash is Amber. capacity infrastructure Depending upon the location of the development some short lengths of <<25 properties capacity reinforcement main maybe required within the village but as a whole there is capacity for 25 properties. After 25 properties reinforcement mains will be required GGreenreen depending on the number of properties. >>25 properties

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8.2.23 East Claydon

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the Claydon Brook tributary which flows surface water from South to North on the east periphery of East Claydon. Any development management within the Environment Agency flood zones (see Figure C.15) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North periphery of East Claydon is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.16).

Anglian Water have identified that there is no public surface water sewer system in East Claydon.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of East Claydon is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The North periphery has permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the East Claydon periphery should allow enough land for attenuation storage.

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development will need to confirm the presence or otherwise of locally agreed standards with the LLFA before commencing design of a SuDS or drainage system.

Water quality East Claydon is served by Wing-Cublington Road WwTW which is operated by environmental Anglian Water Services Limited. The other settlements served by the Wing- limits and Cublington Road WwTW include Cublington, Wing, Winslow and Granborough. wastewater treatment capacity The minimum housing growth scenario being tested through this study is 280, and the maximum is 800. This is in addition to a total of 10 properties that have planning permission that have not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water identify that there is capacity within the WwTW environmental permit (or WwTW water quality consent) for existing commitments and for 280 properties. This higher value of 800 properties could cause the WwTW to exceed its flow consent.

Wing-Cublington WwTW discharges into the Ledburn Brook. The Ledburn Brook is classified as a Heavily Modified Waterbody, and the current overall status is Moderate, with Fish, Phosphate, Ammonia and Dissolved Oxygen status unknown and to be determined. The mitigation measures assessment identifies that moderate status in this waterbody by 2015 is technically infeasible.

Wastewater Anglian Water Services have undertaken a Red Amber Green Assessment for this Network network settlement, and have identified that network capacity in this settlement is Amber, capacity infrastructure and that the ability to provide additional infrastructure if required is Amber. capacity Amber There is no history or foul flooding in East Clayon, and there are no combined sewer overflows. Infrastructure feasibility Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are Amber infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water cycle Analysis Assessment element

Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for East Clayon is capacity infrastructure Amber. Depending upon the location of the development some short lengths of <<15 properties capacity reinforcement main maybe required within the village but as a whole there is capacity for 15 properties. After 15 properties reinforcement mains will be required Green depending on the number of properties. >>15 properties

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8.2.24 Granborough

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the Claydon Brook tributaries on the surface water periphery of Granborough. Any development within the Environment Agency management flood zones (see Figure C.19) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North periphery of Granborough is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.20).

Anglian Water have identified that less than 10% of the perperties in Granborough are served by a public surface water sewer.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Granborough is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The North and South peripheries are underlain by permeable soil and are identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Granborough periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Granborough is served by Wing-Cublington Road WwTW which is operated by environmental limits Anglian Water Services Limited. The other settlements served by the Wing- and wastewater Cublington Road WwTW include Cublington, Wing, East Claydon and Winslow. treatment capacity The minimum housing growth scenario being tested through this study is 280, and the maximum is 800. This is in addition to a total of 10 properties that have planning permission that have not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water identify that there is capacity within the WwTW environmental permit (or WwTW water quality consent) for existing commitments and for 280 properties. This higher value of 800 properties could cause the WwTW to exceed its flow consent.

There is no history of foul flooding in Granborough, and there are four combined Amber sewer overflows. Any development could have a negative impact on water quality if development is upstream of these overflows. This will need to be investigated when exact development locations are known. Infrastructure feasibility

Anglian Water do not consider that wastewater network capacity should be a Amber material strategic planning decision at this stage, and consider that there are infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water cycle Analysis Assessment element

Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Granborough is capacity infrastructure Amber. Depending upon the location of the development some short lengths of <<15 properties capacity reinforcement main maybe required within the village but as a whole there is capacity for 15 properties. After 15 properties reinforcement mains will be required Green depending on the number of properties. >>15 properties

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8.2.25 Stewkley

Water cycle Analysis Assessment element

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Water cycle Analysis Assessment element

There are significant areas of flood risk on the River Thame tributary which flows Flood risk and from North to South on the West periphery of Stewkley. Any development within surface water the Environment Agency flood zones (see Figure C.43) will be subject to a management sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The East and West periphery of Stewkley is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.44).

Anglian Water has identified that less then 5% of the properties in Stewkley are served by a public surface water sewer system.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Stewkley is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The North periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited; therefore any development within the Stewkley periphery should allow enough land for attenuation storage.

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Initially identified as discharging to an Anglian Water works based on data Water quality provided by AWS, therefore TW have not been asked to provide RAG for this environmental limits location. Further work is required by TW to provide an understanding of the and wastewater infrastructure capacity for this settlement. treatment capacity

Initially identified as discharging to an Anglian Water works based on data Wastewater network provided by AWS, therefore TW have not been asked to provide RAG for this Network infrastructure location. Further work is required by TW to provide an understanding of the capacity capacity infrastructure capacity for this settlement.

Notwithstanding this, new developments must be separately sewered, with surface water not being discharged into the combined or foul system. The Flood and Water Management Act contains a provision making the right to connect to public surface Infrastructure feasibility water sewer conditional on the drainage system being approved by the SAB. Therefore any redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment and drainage strategy discussed above.

Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Stewkley is capacity infrastructure Green. Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is capacity for 100 properties. Green

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8.2.26 Marsh Gibbon

Water cycle Analysis Assessment element

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Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Ray tributaries on the South surface water periphery of Marsh Gibbon. Any development within the Environment Agency management flood zones (see Figure C.27) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South periphery of Marsh Gibbon is more susceptible to groundwater flooding than the remainder of the periphery (see Figure C.28).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Marsh Gibbon is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The North periphery is underlain by medium permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Marsh Gibbon periphery should allow enough land for attenuation storage.

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Water quality Marsh Gibbon is served by Aylesbury WwTW which is operated by Thames Water. WwTW environmental limits The other settlements served by Aylesbury WwTW include Aylesbury, Aston infrastructure and wastewater Clinton, Buckland, Drayton Beauchamp, Halton, Hardwick, Hulcott, Weedon and capacity treatment capacity Wendover.

The minimum housing growth scenario being tested through this study is 5,910, Lower limit and the maximum is 12,300. This is in addition to a total of 4942 properties that

have planning permission that have not yet been built. Green

Initial calculations carried out by Thames Water identify that there is capacity in the WwTW environmental permit (or WwTW water quality consent) for an additional 9,000 properties or 22,000 population equivalent

Aylesbury WwTW discharges into the River Thame (Aylesbury to Scotgrove Upper limit Brook). The River Thame (Aylesbury to Scotgrove Brook) is not a designated Waterbody and the current overall status is Poor, with Phosphate status being poor, Red Ammonia and Dissolved Oxygen status is high.

Thames Water Services have undertaken a Red Amber Green Assessment for this settlement, and have identified that wastewater treatment infrastructure capacity in this settlement is Green for the upper limit and green for the lower limit. However, for the combined developments served by the Aylesbury STW the capacity is Red for the upper limit and Green for the lower limit.

The sewage flows from this development will be discharged at Aylesbury STW, which has capacity for an additional 9,000 properties or 22,000 domestic population equivalent without requiring upgrades.

The combined upper limit (12,300 properties) surpasses the capacity of Aylesbury STW requiring upgrades to be undertaken. These upgrades can only be undertaken in the 2020-2025 or 2025-2030 (AMP7 or 8).

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There has been a flooding incident in the existing network; hence an impact study Lower limit would need to be carried out to determine the impact of the proposed development Amber and available network capacity when an exact or preferred development location is known. Upper limit

Thames Water cannot advise of the scale or location of any improvements that may Amber be required until such time as detailed development locations and property numbers are known. Typically, Thames Water estimate wastewater network infrastructure takes between 18 months and three years to plan and deliver. However, in some cases it can take longer than this, and as described in section 3.3, Thames Water may sometimes request a Grampian Condition to protect existing customers from the risk of foul flooding.

Water supply Thames Water Services have undertaken a Red Amber Green Assessment for water network supply and have identified that water supply network capacity for Marsh Gibbon is infrastructure Amber. Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is capacity for 100 properties after the planned AMP6 upgrades for a main reinforcement pipeline. This planned upgrade to the existing network in AMP6 is waiting to be approved by the regulator.

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8.3 Larger settlements in the Southern Vale market area

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8.3.1 Aylesbury

Water cycle Analysis Assessment element

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There are significant areas of flood risk on the River Thame and the Hardwicke Flood risk and Brook on the Northern periphery of Aylesbury. There are also flood risk areas on surface water the Stoke Brook which flows north along the western periphery of Aylesbury and management the Bear and Wendover Brooks which flow west through Aylesbury and converge with the Thame just downstream of Aylesbury WwTW.

There are three flood storage areas, one to the west, and two to the east of Aylesbury which provide protection to the town.

Any development within the Environment Agency flood zones (see Figure A.2a – A.2d) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent (see Figure A.3a-A3b).

Thames Water have identified that, depending on the location, there maybe available surface water assets. In the event of development sites to the south of Aylesbury being considered then a soakaway or discharge to water course could be a relatively simple solution.

The SuDS potential map (Appendix E) identifies that there are a range of soil types underlying Aylesbury, and that the SUDS techniques most appropriate will vary by location. There is a band of permeable substrata tat runs North East to South West crossing the centre of Aylesbury, which is surrounded by an area of low permeability. Those areas identified as being underlain by permeable soil could be suitable for infiltration type SuDS. However, the identification of some areas within the permeable band as being susceptible to groundwater flooding (Figure could mean that opportunities for infiltration SuDS are limited.

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Aylesbury is served by Aylesbury WwTW which is operated by Thames Water. Water quality The other settlements served by the Aylesbury WwTW include Aylesbury, Aston WwTW environmental limits Clinton, Wendover, Buckland, Drayton Beauchamp, Halton, Hardwick, Hulcott, capacity and wastewater Weedon and Marsh Gibbon. treatment capacity The minimum housing growth scenario being tested through this study is 5910, and Upper limit the maximum is 12300. This is in addition to a total of 4942 properties that have

planning permission that have not yet been built. Red

Aylesbury WwTW discharges into the River Thame (Aylesbury to Scotgrove Brook). The River Thame (Aylesbury to Scotgrove Brook) is not a designated Lower limit Waterbody and the current overall status is Poor, Phosphate status is poor,

Ammonia and Dissolved Oxygen status is high. Green

The Environment Agency have advised that the water quality modelling undertaken in support of the Aylesbury Town WCS was sufficient to meet the needs of this study, and hence no further modelling was required. The AMP5 upgrade scheme, agreed by the Environment Agency, and currently being delivered by Thames Water allows for a population increase of approximately 9,000 properties. If an increase of greater than 9,000 properties is planned, the WwTW consent will need to reviewed for environmental capacity.

The sewage flows from this development will be discharged at Aylesbury STW, which has capacity for an additional 9,000 properties or 22,000 domestic population equivalent without requiring upgrades.

The combined upper limit (12,300 properties) surpasses the capacity of Aylesbury STW requiring upgrades to be undertaken. These upgrades can only be undertaken in 2020-2025 or 2025-2030 (AMP7 or 8).

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Thames Water Services have undertaken a Red Amber Green Assessment for this Wastewater network settlement, and have identified that network capacity in this settlement is Red, and Network infrastructure that the ability to provide additional infrastructure if required is Amber. capacity capacity Thames Water have advised that both the upper and lower number of housing Upper limit being tested will likely require either significant upgrades or the installation of new Red assets to accommodate demand, and that any solution to the proposed growth figures will be a significant project with a multi year duration (including planning Lower limit and design).

Red Currently Thames Water have concerns with the overloading of the northern trunk

sewer (northern arc development), in part due to the unconfirmed contribution from ARLA dairies. At present, the preferred option for Thames Water would be the southern arc development and/or development in close proximity to the works which can benefit from a dedicated outfall sewer directly to the works. It must be Infrastructure highlighted that this is the current view; however, once more information becomes feasibility available with regard to the future status of the northern trunk sewer, this picture

of preferred location may change. Amber

Thames Water have idenitified that there is no absolute water resource constraint in Water supply Aylesbury, but this is based on an assumption that new build properties will Network network achieve the water efficiency standards equivalent to CSH level 3 or 4. capacity infrastructure Development of of the order of magnitude proposed (both the upper and lower capacity limit) will require the construction of a major transfer main. This is currently Amber within plans for AMP6 to be funded through the business planning process and supported by customer bills. This requires regulator approval in 2014 before it can

be confirmed, and regulator approval will be contingent on confirmed proposals for future housing delivery. Once approved, the scheme will take a minimum of 3 Infrastructure years to construct and construction could not begin before 2015. feasibility

Amber

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8.3.2 Haddenham

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Thame tributary which flows surface water from East to South on the East periphery of Haddenham. Any development within management the Environment Agency flood zones (see Figure D.33) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South East periphery of Haddenham is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.34).

Depending on the location, there maybe available surface water assets. If the Aylesbury southern arc is the preferred option then a soakaway or discharge to water course could be a relatively simple solution.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Haddenham is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Haddenham periphery should allow enough land for attenuation storage.

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Haddenham discharges to Haddenham WwTW. Thames Water have confirmed Water quality that they have consented capacity at the WwTW for up to 400 properties. WwTW environmental limits capacity and wastewater Thames Water Services have undertaken a Red Amber Green Assessment for this treatment capacity settlement, and have identified that wastewater treatment infrastructure capacity in this settlement is Amber for the upper limit and Green for the lower limit. Upper limit

The wastewater from this development will be discharged at Haddenham STW. Amber The STW will be able to support the lower housing development limit of 200 without any concerns. However the higher limit of 400 would raise concerns with Thames Water as the STW will not be able to treat the increased sewage flow Lower limit without upgrades to the infrastructure.

Green The Environment Agency advised that they did not consider Haddenham WwTW to be a risk with respect to water quality, and that water quality modelling was not required at this stage of the planning process.

Haddenham STW currently has issues restricting the performance and available capacity. Resolution of this issue could potentially be one to two years. This will likely increase capacity at the site. Once the solution for this issue has been realised, Thames Water will be able to revise their comments around potential capacity.

Thames Water Services have undertaken a Red Amber Green Assessment for this Wastewater network settlement, and have identified that network capacity in this settlement is Amber, Network infrastructure and that the ability to provide additional infrastructure if required is Amber for the capacity capacity upper limit and Green for the lower limit. Upper limit

A basic desktop study undertaken by Thames Water identifies that 400 properties could be accomodated in the network; however regardless of which limit is chosen, Amber it would be preferred that the location was to the south of the town.

Where additional infrastructure is required, it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater Lower limit network infrastructure through the requisition process is 12 to 24 months.

Green New developments must be separately sewered, with surface water not being discharged into the combined or foul system. The Flood and Water Management Act contains a provision making the right to connect to public surface water sewer Infrastructure conditional on the drainage system being approved by the SAB. Therefore any feasibility redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment Green and drainage strategy discussed above.

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Thames Water have identified that there is no absolute water resource Water supply network constraint in Haddenham, but this is based on an assumption that new build Network infrastructure capacity properties will achieve the water efficiency standards equivalent to CSH level 3 capacity or 4. Thames Water Services have undertaken a Red Amber Green Assessment for water supply and have identified that water supply network capacity for Amber Haddenham is Amber.

Development of the order of magnitude proposed (both the upper and lower limit) will require the construction of a major transfer main. This is currently Infrastructure within plans for AMP6 to be funded through the business planning process and feasibility supported by customer bills. This requires regulator approval in 2014 before it can be confirmed, and regulator approval will be contingent on confirmed proposals for future housing delivery. Once approved, the scheme will take a minimum of 3 years to construct and construction could not begin before 2015. Amber

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8.3.3 Wendover

Water cycle Analysis Assessment element

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Flood risk and There are significant areas of flood risk on the Grand Union Canal Walk Floodplain surface water which flows from South to North through the central corridor of Wendover to the management North periphery. Any development within the Environment Agency flood zones (see Figures D.73 and D.74) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North and South peripheries of Wendover are more susceptible to groundwater flooding than the remainder of the periphery (see Figures D.75 and D.76).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Wendover is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Wendover periphery should allow enough land for attenuation storage.

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Water quality Wendover is served by Aylesbury WwTW which is operated by Thames Water. WwTW environmental limits The other settlements served by the Aylesbury WwTW include Aylesbury, Aston capacity and wastewater Clinton, Buckland, Drayton Beauchamp, Halton, Hardwick, Hulcott, Weedon and treatment capacity Marsh Gibbon. Upper limit The minimum housing growth scenario being tested through this study is 5910, and

the maximum is 12300. This is in addition to a total of 4942 properties that have Red planning permission that have not yet been built.

Aylesbury WwTW discharges into the River Thame (Aylesbury to Scotgrove Lower limit Brook). The River Thame (Aylesbury to Scotgrove Brook) is not a designated

Waterbody and the current overall status is Poor, Phosphate status is poor, Green Ammonia and Dissolved Oxygen status is high.

The sewage flows from this development will be discharged at Aylesbury STW, which has capacity for an additional 9,000 properties or 22,000 domestic population equivalent without requiring upgrades.

The combined upper limit (12,300 properties) surpasses the capacity of Aylesbury STW requiring upgrades to be undertaken. These upgrades can only be undertaken in 2020-2025 or 2025-2030 (AMP7 or 8).

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Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure settlement, and have identified that network capacity in this settlement is Amber capacity capacity for the higher housing number, and green for the lower. The ability to provide Upper limit additional infrastructure if required is Amber. Amber Wendover drains into the northern trunk sewer around the same area where ARLA Lower limit dairies will be contributing to the network. Thames Waters preferance for development location is to the north of the town, either connecting to the network around Rowborough Copse or to the west of the Grand Union Canal (Wendover Green Arm). If 400 properties are chosen, then Thames assets would be more accomodating to the west of the Grand Union Canal (450mm sewers). The sewer around Rowborough Copse is a smaller diameter sewer (300mm); therefore we would be more concerned if 400 properties were to connect into this. At this Infrastructure location, 200 would be more appropriate. Due to exisiting issues in the lower part feasibility of this catchment (ie. to the east and centre of the town), it would be preferred that development was located elsewhere. Amber

Water supply Thames Water have identified that there is no absolute water resource constraint in Network network Aylesbury Vale, but this is based on an assumption that new build properties will capacity infrastructure achieve the water efficiency standards equivalent to CSH level 3 or 4. capacity Amber Thames Water Services have undertaken a Red Amber Green Assessment for water supply and have identified that water supply network capacity for Wendover is

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported Major transfer by customer bills. This requires regulator approval in 2014 before it can be main confirmed, and regulator approval will be contingent on confirmed proposals for

future housing delivery. Once approved, the scheme will take a minimum of 3 Amber years to construct and construction could not begin before 2015. Minor rezoning works Some minor reinforcement work may be required which be delivered through the developer requisition process. Green

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8.4 Smaller settlements in the Southern Vale market area

8.4.1 Aston Abbots

Water cycle element Analysis Settlements

Flood risk and surface There are no significant areas of flood risk in the periphery of Aston Abbots (see water management Figure D.3).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North East periphery of Aston Abbots is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.4).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Aston Abbots is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. Any development within the Aston Abbots periphery should allow enough land for attenuation storage.

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Water cycle element Analysis Settlements

Water quality Aston Abbots is served by Aston Abbots Road WwTW which is operated by environmental limits Anglian Water Services Limited. and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 20, and the maximum is 100. This is in addition to a total of two properties that have planning permission that have not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water identify that there is capacity in the WwTW environmental permit (or WwTW water quality consent) for both the upper and lower number of houses being tested by this study.

Aston Abbots WwTW discharges into the Ledburn Brook. The Ledburn Brook is classified as a Heavily Modified Waterbody, and the current overall status is Moderate, with Fish, Phosphate, Ammonia and Dissolved Oxygen status unknown and to be determined, and the mitigation measures assessment identifies that good status in this waterbody by 2015 is technically infeasible.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for Network infrastructure capacity this settlement, and have identified that network capacity in this settlement is Capacity Amber, and that the ability to provide additional infrastructure if required is Amber. Amber

There is no history or foul flooding in Aston Abbots, and there are no combined

sewer overflows. Infrastructure Anglian Water do not consider that wastewater network capacity should be a feasibility material strategic planning decision at this stage, and consider that there are infrastructure and management options that could be implemented for the scale Amber of development being tested within the likely delivery programme for a

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Water cycle element Analysis Settlements

Water supply network Anglian Water Services have undertaken a Red Amber Green Assessment for Network infrastructure capacity water supply and have identified that water supply network capacity for Aston Capacity Abbots is Amber. Depending upon the location of the development some short lengths of reinforcement main maybe required within the village but as a whole Amber there is capacity for 50 properties. After 50 properties reinforcement mains will be required depending on the number of properties.

If short lengths of reinforcement main are needed, they will be delivered Infrastructure through the developer requisition process, and the typical time for delivery feasibility through the standard requisition process is 12 to 24 months.

Amber

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8.4.2 Slapton

Water cycle Analysis Assessment element

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Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Ouzel and its tributary on the surface water North periphery of Slapton. Any development within the Environment Agency management flood zones (see Figure D.67) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South periphery of Slapton is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.68).

Anglian Water have identified that there is no public surface water sewer network in Slapton.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Slapton is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited; therefore any development within the Slapton periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Slapton is served by Slapton WwTW which is operated by Anglian Water Services environmental limits Limited. and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 20 and the maximum is 100. This is in addition to a total of six properties that have planning permission that have not yet been built.

Slapton WwTW is a small WwTW with a descriptive consent. As the WwTW is Red small, a large development is likely to have a disproportionately high impact on the WwTW, and it is likely that significant WwTW improvements will need to be delivered through the business planning process. Further assessment will need to be undertaken by AWS to confirm exactly what the infrastructure impact would be, and whether this impact should be considered as part of a viability assessment of development in this settlement.

Horton WwTW discharges into the River Ouzel. The River Ouzel is classified as a Heavily Modified Waterbody, and the current overall status is Moderate, with Fish status being moderate. Phosphate, Ammonia and Dissolved Oxygen status are not known and to be determined and the mitigation measures assessment identifies that good status in this waterbody by 2015 is technically infeasible.

Anglian Water do not consider that wastewater network capacity should be a Infrastructure material strategic planning decision at this stage, and consider that there are feasibility infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a development Amber of the scale identified. Where additional infrastructure is required, it will need to

be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water cycle Analysis Assessment element

Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Slapton is Capacity infrastructure Green. Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is Green capacity for 100 properties.

If short lengths of reinforcement main are needed, they will be delivered through the developer requisition process, and the typical time for delivery through the Infrastructure standard requisition process is 12 to 24 months. feasibility

Amber

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8.4.3 Ivinghoe

Water cycle element Analysis Assessment

Flood risk and surface There are no significant areas of flood risk in the periphery of Ivinghoe (see water management Figure D.43).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The East periphery of Ivinghoe is less susceptible to groundwater flooding than the remainder of the periphery (see Figure D.44).

Anglian Water has identified that there is no public surface water sewer network in Ivinghoe.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Ivinghoe is underlain by medium permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Ivinghoe periphery should allow enough land for attenuation storage.

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Water cycle element Analysis Assessment

Water quality Ivinghoe is served by Ivinghoe WwTW which is operated by Anglian Water environmental limits Services Limited. The Ivinghoe WwTW also serves the Pitstone settlement. and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 40 and the maximum is 400. This is in addition to a total of 129 properties that have planning permission that have not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water identify that there is capacity within the WwTW environmental permit (or WwTW water quality consent) for existing commitments and for 40 properties. This higher value of 400 properties could cause the WwTW to exceed its flow consent.

Ivinghoe WwTW discharges into the Whistle Brook. The Whistle Brook is classified as a Heavily Modified Waterbody and the current overall status is Moderate with no classification for Fish. The Ammonia and Dissolved Oxygen status are classified as high and Phosphate status is Poor.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for Network infrastructure capacity this settlement, and have identified that network capacity in this settlement is Capacity Amber, and that the ability to provide additional infrastructure if required is Amber. Amber

There is no history or foul flooding in Ivinghoe, and there are no combined

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Water cycle element Analysis Assessment

Water supply network Anglian Water Services have undertaken a Red Amber Green Assessment for Network infrastructure capacity water supply and have identified that water supply network capacity for Capacity Ivinghoe is Amber. Depending upon the location of the development some <20 properties short lengths of reinforcement main maybe required within the village but as a whole there is capacity for 20 properties. After 20 properties the network will Green require a reinforcement main.

If short lengths of reinforcement main are needed, they will be delivered >20 properties through the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months. Amber

Infrastructure feasibility

Amber

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8.4.4 Pitstone

Water cycle element Analysis Figure reference

There are no significant areas of flood risk in the periphery of Pitstone (see Flood risk and surface Figure D.59). water management The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent (see Figure D.60).

Anglian Water have identified that there is a public surface water sewer serving Pitstone, and there are no known issues with the system.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Pitstone is underlain permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited; therefore any development within the Pitstone periphery should allow enough land for attenuation storage.

Water quality Pitstone is served by Ivinghoe WwTW which is operated by Anglian Water environmental limits Services Limited. The Ivinghoe WwTW also serves the Ivinghoe settlement. and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 40 and the maximum is 400. This is in addition to a total of 129 properties that have planning permission that have not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water identify that there is capacity within the WwTW environmental permit (or WwTW water quality consent) for existing commitments and for 40 properties. This higher value of 400 properties could cause the WwTW to exceed its flow consent.

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Water cycle element Analysis Figure reference

Anglian Water do not consider that wastewater network capacity should be a Infrastructure material strategic planning decision at this stage, and consider that there are feasibility infrastructure and management options that could be implemented for the scale of development being tested within the likely delivery programme for a Amber development of the scale identified. Where additional infrastructure is required,

it will need to be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

Anglian Water Services have undertaken a Red Amber Green Assessment for Water supply network water supply and have identified that water supply network capacity for Network infrastructure capacity Pitstone is Green. Depending upon the location of the development some short Capacity lengths of reinforcement main maybe required within the village but as a whole there is capacity for 100 properties. Green

If short lengths of reinforcement main are needed, they will be delivered through

the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months. Infrastructure feasibility

Amber

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8.4.5 North Marston

Water cycle element Analysis Figure reference

There are significant areas of flood risk on the Claydon Brook tributaries north Flood risk and surface periphery of North Marston. Any development within the Environment Agency water management flood zones (see Figure D.53) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The East and West peripheries of North Marston are more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.54).

Anglian Water have identified that North Marston has a public surface water sewer, and that there are no known issues with the system.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of North Marston is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The North periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the North Marston periphery should allow enough land for attenuation storage.

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Water cycle element Analysis Figure reference

development will need to confirm the presence or otherwise of locally agreed standards with the LLFA before commencing design of a SuDS or drainage system.

Water quality North Marston is served by North Marston WwTW which is operated by Anglian environmental limits Water Services Limited. and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 20 and the maximum is 100. This is in addition to one property that has planning permission that has not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water Red suggest that there is capacity within the WwTW environmental permit (or WwTW water quality consent) for existing commitments and for up to 100 properties. However, both the EnvironmentAgency and Anglian Water have advised that there is no consented capacity within the existing permit, therefore capacity should be considered red until otherwise advised.

North Marston WwTW discharges into the River Twin. The River Twin is classified as a Heavily Modified Waterbody and the current overall status is Good with no classification for Fish. The Ammonia and Dissolved Oxygen status are classified as high and Phosphate status is Good.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure capacity settlement, and have identified that network capacity in this settlement is Amber, Capacity and that the ability to provide additional infrastructure if required is Amber. Amber There is no history or foul flooding in North Marston, and there are no combined sewer overflows.

be provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water cycle element Analysis Figure reference

Water supply network Anglian Water Services have undertaken a Red Amber Green Assessment for water Network infrastructure capacity supply and have identified that water supply network capacity for North Marston Capacity is Amber. Depending upon the location of the development some short lengths of <15 properties reinforcement main maybe required within the village but as a whole there is capacity for 15 properties. After 15 properties reinforcement mains will be required Green depending on the number of properties.

If short lengths of reinforcement main are needed, they will be delivered through >15 properties the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months. Amber

Infrastructure feasibility

Amber

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8.4.6 Oving

Water cycle element Analysis Figure reference

Flood risk and surface There are no significant areas of flood risk in the periphery of Oving (see Figure water management D.57).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The East and West peripheries of Oving are more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.58).

The SuDS potential map (Appendix E) identifies that the northern periphery Oving is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The South periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited; therefore any development within the Oving periphery should allow enough land for attenuation storage.

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Water cycle element Analysis Figure reference

Water quality Oving is served by Oving WwTW which is operated by Anglian Water Services environmental limits Limited. The other settlement served by the Oving WwTW is Whitchurch. and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 40, and the maximum is 200. This is in addition to a total of 40 properties that have planning permission that have not yet been built.

Oving WwTW discharges into the Claydon Brook. The Claydon Brook is classified as a Heavily Modified Waterbody, and the current overall status is Good, Ammonia status is high and both Phosphate and Dissolved Oxygen current status are good.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for Network infrastructure capacity this settlement, and have identified that network capacity in this settlement is Capacity Amber, and that the ability to provide additional infrastructure if required is Amber. Amber

There is no history or foul flooding in Oving, and there are no combined sewer

overflows. Infrastructure Anglian Water do not consider that wastewater network capacity should be a feasibility material strategic planning decision at this stage, and consider that there are infrastructure and management options that could be implemented for the scale Amber of development being tested within the likely delivery programme for a

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Water cycle element Analysis Figure reference

Water supply network Anglian Water Services have undertaken a Red Amber Green Assessment for Network infrastructure capacity water supply and have identified that water supply network capacity for Oving Capacity is Amber. Depending upon the location of the development some short lengths of reinforcement main maybe required within the village but as a whole there is Amber capacity for 50 properties. After 50 properties the water booster will need to be upgraded.

If short lengths of reinforcement main are needed, they will be delivered through Infrastructure the developer requisition process, and the typical time for delivery through the feasibility standard requisition process is 12 to 24 months.

Amber

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8.4.7 Whitchurch

Water cycle element Analysis Assessment

Flood risk and surface There are no significant areas of flood risk in the periphery of Whitchurch (see water management Figure D.79).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North East periphery of Whitchurch is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.80).

Anglian Water have identified that there is no public surface water sewer serving Oving.

The SuDS potential map (Appendix E) identifies that the North periphery of Whitchurch is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The South periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Whitchurch periphery should allow enough land for attenuation storage.

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Water cycle element Analysis Assessment

Water quality Whitchurch is served by Oving WwTW which is operated by Anglian Water environmental limits Services Limited. The other settlement served by the Oving WwTW is Oving. and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 40, and the maximum is 200. This is in addition to a total of 40 properties that have planning permission that have not yet been built.

Oving WwTW discharges into the Claydon Brook. The Claydon Brook is classified as a Heavily Modified Waterbody, and the current overall status is Good, with Fish status is unknown, Ammonia status is high and both Phosphate and Dissolved Oxygen current status are good.

Wastewater network Anglian Water Services have undertaken a Red Amber Green Assessment for Network infrastructure capacity this settlement, and have identified that network capacity in this settlement is Capacity Amber, and that the ability to provide additional infrastructure if required is Amber. Amber

There is no history or foul flooding in Whitchurch, and there are no combined

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Water cycle element Analysis Assessment

Anglian Water Services have undertaken a Red Amber Green Assessment for Water supply network water supply and have identified that water supply network capacity for Network infrastructure capacity Whitchurch is Green. Depending upon the location of the development some Capacity short lengths of reinforcement main maybe required within the village but as a <100 properties whole there is capacity for 100 properties. After 100 properties reinforcement mains will be required depending on the number of properties. Green

If short lengths of reinforcement main are needed, they will be delivered through the developer requisition process, and the typical time for delivery >100 properties through the standard requisition process is 12 to 24 months.

Amber

Infrastructure feasibility

Amber

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8.4.8 Edlesborough

Water cycle Analysis Assessment element

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Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Ouzel which flows from South surface water East to North West through the central corridor of the town. Any development management within the Environment Agency flood zones (see Figure D.29) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The West periphery of Edlesborough is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.30). Anglian Water have identified that there is a limited public surface water sewer system in the Northern part of Eddlesborough.

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Edlesborough is underlain by medium permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Edlesborough periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Edlesborough is served by Stanbridgeford WwTW which is operated by Anglian environmental limits Water Services Limited. and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 20, and the maximum is 100.

Stanbridgeford WwTW discharges into the River Ouzel Brook. The River Ouzel Brook is classified as a Heavily Modified Waterbody, and the current overall status is Good, with Fish status unknown, Ammonia and Dissolved Oxygen current status High and the Phosphate status poor. The mitigation measures current and 2015 status is good with no justification given.

provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water cycle Analysis Assessment element

Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Edlesborough is Capacity infrastructure Green. Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is Green capacity for 100 properties. If short lengths of reinforcement main are needed, they will be delivered through the developer requisition process, and the typical time for

delivery through the standard requisition process is 12 to 24 months. Infrastructure feasibility

Amber

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8.4.9 Cublington

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Thame tributary Floodplain surface water which flows from North to South on the West periphery of Cublington. Any management development within the Environment Agency flood zones (see Figure D.21) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The east and West peripheries of Cublington are more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.22).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Cublington is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. Any development within the Cublington periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Cublington is served by Wing-Cublington Road WwTW which is operated by environmental limits Anglian Water Services Limited. The other settlements served by the Wing- and wastewater Cublington Road WwTW include Winslow, Wing, East Claydon and Granborough. treatment capacity The minimum housing growth scenario being tested through this study is 280, and the maximum is 800. This is in addition to a total of 10 properties that have planning permission that have not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water identify that there is capacity within the WwTW environmental permit (or WwTW water quality consent) for existing commitments and for 280 properties. This higher value of 800 properties could cause the WwTW to exceed its flow consent.

Wing-Cublington WwTW discharges into the Ledburn Brook. The Ledburn Brook is classified as a Heavily Modified Waterbody, and the current overall status is Moderate, with Fish, Phosphate, Ammonia and Dissolved Oxygen status unknown and to be determined.The mitigation measures assessment identifies that good status in this waterbody by 2015 is technically infeasible.

There is no history or foul flooding in Cublington, and there are no combined Amber sewer overflows.

Anglian Water do not consider that wastewater network capacity should be a material strategic planning decision at this stage, and consider that there are Infrastructure infrastructure and management options that could be implemented for the scale of feasibility development being tested within the likely delivery programme for a development of the scale identified. Where additional infrastructure is required, it will need to be Amber provided through the developer requisition process, and the typical timeframe for

delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

Although the wastewater network discharges into Wing WwTW, the majority of the wastewater network in Cublington is the responsibility of Thames Water.

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Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Cublington is Capacity infrastructure Green. Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is Green capacity for 100 properties. If short lengths of reinforcement main are needed, they will be delivered through the developer requisition process, and the typical time for

delivery through the standard requisition process is 12 to 24 months. Infrastructure feasibility

Amber

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8.4.10 Wing

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the Grand Union Canal Walk tributary surface water which flows South to North on the West periphery of Wing. Any development management within the Environment Agency flood zones (see Figure D.81) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North and West peripheries of Wing are more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.82).

Anglian Water have identified that there is no public surface water sewer serving Wing.

The SuDS potential map (Appendix E) identifies that the northern periphery of Wing is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The South periphery is underlain by medium permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Wing periphery should allow enough land for attenuation storage.

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standards with the LLFA before commencing design of a SuDS or drainage system.

Water quality Wing is served by Wing-Cublington Road WwTW which is operated by Anglian environmental limits Water Services Limited. The other settlements served by the Wing-Cublington and wastewater Road WwTW include Cublington, Winslow, East Claydon and Granborough. treatment capacity The minimum housing growth scenario being tested through this study is 280, and the maximum is 800. This is in addition to a total of 10 properties that have planning permission that have not yet been built.

Initial calculations carried out following an approach agreed with Anglian Water identify that there is capacity within the WwTW environmental permit (or WwTW water quality consent) for existing commitments and for 280 properties. This higher value of 800 properties could cause the WwTW to exceed its flow consent.

Wing-Cublington WwTW discharges into the Ledburn Brook. The Ledburn Brook is classified as a Heavily Modified Waterbody, and the current overall status is Moderate, with Fish, Phosphate, Ammonia and Dissolved Oxygen status unknown and to be determined.The mitigation measures assessment identifies that good status in this waterbody by 2015 is technically infeasible.

provided through the developer requisition process, and the typical timeframe for delivery of wastewater network infrastructure through the requisition process is 12 to 24 months.

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Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Wing is Amber. Capacity infrastructure Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is Amber capacity for 75 properties. After 75 properties reinforcement mains will be required depending on the number of properties.

Amber

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8.4.11 Wingrave

Water cycle element Analysis Assessment

Flood risk and surface There are no significant areas of flood risk periphery of Wingrave (see Figure water management D.83).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South periphery of Wingrave is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.84).

The SuDS potential map (Appendix E) identifies that the periphery of Wingrave is underlain by medium permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Wingrave periphery should allow enough land for attenuation storage.

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Water quality Wingrave is is served by Wingrave WwTW which is operated by Thames Water environmental limits Utilities Limited. and wastewater treatment capacity Initially identified as discharging to an Anglian Water works based on data provided by AWS, therefore TW have not been asked to provide RAG for this location. Further work is required by TW to provide an understanding of the infrastructure capacity for this settlement.

Nothwithstanding that, new developments must be separately sewered, with surface water not being discharged into the combined or foul system. The Flood and Water Management Act contains a provision making the right to connect to public surface water sewer conditional on the drainage system being approved by the SAB. Therefore any redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment and drainage strategy discussed above.

Wastewater network Initially identified as discharging to an Anglian Water works based on data infrastructure capacity provided by AWS, therefore TW have not been asked to provide RAG for this location. Further work is required by TW to provide an understanding of the infrastructure capacity for this settlement.

Water supply network Anglian Water Services have undertaken a Red Amber Green Assessment for Network infrastructure capacity water supply and have identified that water supply network capacity for Capacity Wingrave is Green. Depending upon the location of the development some short lengths of reinforcement main maybe required within the village but as a Green whole there is capacity for 100 properties.

If short lengths of reinforcement main are needed, they will be delivered Infrastructure feasibility through the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months. Amber

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8.4.12 Rowsham

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Thame tributary which flows surface water from East to West on the South periphery of Rowsham. Any development within management the Environment Agency flood zones (see Figure D.63) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South periphery of Rowsham is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.64).

The SuDS potential map (Appendix E) identifies that the southern periphery of Rowsham is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The North periphery is underlain by medium permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Rowsham periphery should allow enough land for attenuation storage.

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Water quality Rowsham is is served by Rowsham WwTW which is operated by Thames Water environmental limits Utilities Limited. and wastewater treatment capacity Initially identified as discharging to an Anglian Water works based on data provided by AWS, therefore TW have not been asked to provide RAG for this location.

Wastewater network Initially identified as discharging to an Anglian Water works based on data infrastructure provided by AWS, therefore TW have not been asked to provide RAG for this capacity location. New developments must be separately sewered, with surface water not being discharged into the combined or foul system. The Flood and Water Management Act contains a provision making the right to connect to public surface water sewer conditional on the drainage system being approved by the SAB. Therefore any redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment and drainage strategy discussed above.

Water supply Anglian Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Rowsham is Capacity infrastructure Amber. Depending upon the location of the development some short lengths of <25 properties capacity reinforcement main maybe required within the village but as a whole there is capacity for 25 properties. After 25 properties reinforcement mains will be required Green depending on the number of properties. >>25 properties

If short lengths of reinforcement main are needed, they will be delivered through Amber the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months.

Infrastructure feasibility

Amber

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8.4.13 Creslow

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Thame tributary which flows surface water from North to South on the East periphery of Creslow. Any development within management the Environment Agency flood zones (see Figure D.19) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding on the periphery of the urban extent. The North East periphery of Creslow is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.20).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Creslow is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The South periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Creslow periphery should allow enough land for attenuation storage.

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Water quality Creslow is is served by Creslow WwTW which is operated by Thames Water environmental limits Utilities Limited. and wastewater treatment capacity Initially identified as discharging to an Anglian Water works based on data provided by AWS, therefore TW have not been asked to provide RAG for this location.

Anglian Water Services have undertaken a Red Amber Green Assessment for water Water supply supply and have identified that water supply network capacity for Creslow is Network network Green. Depending upon the location of the development some short lengths of Capacity infrastructure reinforcement main maybe required within the village but as a whole there is capacity capacity for 100 properties. Green

Amber

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8.4.14 Aston Clinton

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the Grand Union Canal tributary which surface water flows from South to North on the West periphery of Aston Clinton. Any management development within the Environment Agency flood zones (see Figure D.5) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The SuDS potential map (Appendix E) identifies that the majority of Aston Clinton’s periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Aston Clinton periphery should allow enough land for attenuation storage.

All development, including proposals outside of any identified flood risk area will require a FRA to identify any local flood risk issues not identified in national mapping, and will require a drainage strategy, including detailed SuDS proposals for surface water management. All SuDS schemes will need to comply with the National SuDS standards when they are adopted, and be approved by the SuDS approval body for any development proposals submitted after the SuDS Approval Body is inaugurated (not before Spring 2013). The Lead Local Flood Authority may adopt local SuDS standards that differ to the National SuDS standards as the Local Flood Risk Management Strategy is developed. Any development will need to confirm the presence or otherwise of locally agreed standards with the LLFA before commencing design of a SuDS or drainage system.

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Aston Clinton is served by Aylesbury WwTW which is operated by Thames Water. Water quality The other settlements served by the Aylesbury WwTW include Aylesbury, WwTW environmental limits Wendover, Buckland, Drayton Beauchamp, Halton, Hardwick, Hulcott, Weedon capacity and wastewater and Marsh Gibbon. treatment capacity The minimum housing growth scenario being tested through this study is 5910, and Upper limit the maximum is 12,300. This is in addition to a total of 4942 properties that have

planning permission that have not yet been built. Amber

Ammonia and Dissolved Oxygen status is high. Green

The Environment Agency have advised that the water quality modelling undertaken in support of the Aylesbury Town WCS was sufficient to meet the needs of this study, and hence no further modelling was required. The AMP5 upgrade scheme, agreed by the Environment Agency and that is currently being delivered by Thames Water, allows for a population increase of approximately 9,000 properties. If an increase of greater than 9,000 properties is planned, the WwTW consent will need to be reviewed for environmental capacity.

Wastewater network The sewerage system in Aston Clinton is the responsibility of Thames Water. Network infrastructure Thames Water have undertaken Red Amber Green assessment, and they have capacity capacity identified that network capacity in this settlement is green for the lower limit, and Upper limit Amber for the upper limit. The ability to provide additional infrastructure if required is Amber. Amber

Lower limit This site will ultimately connect into the northern trunk sewer, and Thames Water hgave advised that there are currently concerns over the available capacity of this Green part of the network, in part due to the uncertainty of flow from ARLA at present. Due to the development of ARLA in Aston Clinton, the network is under increased strain. With the existing network asset in place, 100 properties is a figure for concern.

Infrastructure New developments must be separately sewered, with surface water not being feasbility discharged into the combined or foul system. The Flood and Water Management Act contains a provision making the right to connect to public surface water sewer Amber conditional on the drainage system being approved by the SAB. Therefore any redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment

and drainage strategy discussed above.

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Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

housing delivery. Once approved, the scheme will take a minimum of 3 years to Amber construct and construction could not begin before 2015. Minor rezoning works Some minor reinforcement work may be required which be delivered through the developer requisition process. Green

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8.4.15 Buckland

Water cycle element Analysis Assessment

Water quality Buckland is served by Aylesbury WwTW which is operated by Thames Water. WwTW environmental limits The other settlements served by the Aylesbury WwTW include Aylesbury, Aston capacity and wastewater Clinton, Buckland, Drayton Beauchamp, Halton, Hardwick, Hulcott, Weedon treatment capacity and Marsh Gibbon. Upper limit The minimum housing growth scenario being tested through this study is 5910,

and the maximum is 12300. This is in addition to a total of 4942 properties that Red have planning permission that have not yet been built.

Aylesbury WwTW discharges into the River Thame (Aylesbury to Scotgrove Lower limit Brook). The River Thame (Aylesbury to Scotgrove Brook) is not a designated

Waterbody and the current overall status is Poor, Phosphate status is poor, Green Ammonia and Dissolved Oxygen status is high.

The sewage flows from this development will be discharged at Aylesbury STW, which has capacity for an additional 9,000 properties or 22,000 domestic population equivalent without requiring upgrades.

The combined upper limit (12,300 properties) surpasses the capacity of Aylesbury STW requiring upgrades to be undertaken. These upgrades can only be undertaken in 2020-2025 or 2025-2030 (AMP7 or 8).

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This site must be considered in conjunction with the discharge from ARLA dairies. There also is a history of hydraulic flooding in Aston Clinton that could Amber

reoccur as a result of a large development in Buckland.

Due to the development of ARLA in Aston Clinton, the network is under increased strain. With the existing network asset in place, please consider 100 Lower limit properties a figure for concern.

any redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment and drainage strategy discussed above.

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Water cycle element Analysis Assessment

Water supply network Thames Water have identified that there is no absolute water resource constraint Network infrastructure capacity in Aylesbury Vale, but this is based on an assumption that new build properties capacity will achieve the water efficiency standards equivalent to CSH level 3 or 4. Amber Thames Water Services have undertaken a Red Amber Green Assessment for water supply and have identified that water supply network capacity for

Wendover is Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower feasibility limit) will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and Major transfer supported by customer bills. This requires regulator approval in 2014 before it main can be confirmed, and regulator approval will be contingent on confirmed

proposals for future housing delivery. Once approved, the scheme will take a Amber minimum of 3 years to construct and construction could not begin before 2015. Minor rezoning works Some minor reinforcement work may be required which be delivered through the developer requisition process. Green

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8.4.16 Drayton Beauchamp

Water cycle element Analysis Assessment

Flood risk and surface There are no significant areas of flood risk in the periphery of Drayton water management Beauchamp (see Figure D.27.)

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North periphery of Drayton Beauchamp is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.28).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Drayton Beauchamp is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Drayton Beauchamp periphery should allow enough land for attenuation storage.

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Water cycle element Analysis Assessment

Water quality Drayton Beauchamp is served by Aylesbury WwTW which is operated by WwTW capacity environmental limits Thames Water. The other settlements served by the Aylesbury WwTW include and wastewater Aylesbury, Aston Clinton, Buckland, Drayton Beauchamp, Halton, Hardwick, treatment capacity Hulcott, Weedon and Marsh Gibbon. Upper limit

The minimum housing growth scenario being tested through this study is 5910, Red and the maximum is 12300. This is in addition to a total of 4942 properties that have planning permission that have not yet been built. Lower limit Aylesbury WwTW discharges into the River Thame (Aylesbury to Scotgrove

Brook). The River Thame (Aylesbury to Scotgrove Brook) is not a designated Green Waterbody and the current overall status is Poor, Phosphate status is poor, Ammonia and Dissolved Oxygen status is high.

The sewage flows from this development will be discharged at Aylesbury STW, which has capacity for an additional 9,000 properties or 22,000 domestic population equivalent without requiring upgrades.

The combined upper limit (12,300 properties) surpasses the capacity of Aylesbury STW requiring upgrades to be undertaken. These upgrades can only be undertaken in 2020-2025 or 2025-2030 (AMP7 or 8).

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Water cycle element Analysis Assessment

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Network infrastructure capacity settlement, and have identified that network capacity in this settlement is Amber capacity for the upper limit and green for the lower limit. Upper limit

This site must be considered in conjunction with the discharge from ARLA Amber diaries. There is history of foul flooding in Aston Clinton network which is

connected to Drayton Beauchamp which may be increased by the proposed development. Therefore a network study will be required. Due to the Lower limit development of ARLA in Aston Clinton, the network is under increased strain. With the existing network asset in place, please consider 100 properties a figure Green for concern.

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8.4.17 Halton

Water cycle element Analysis Assessment

Flood risk and surface There are no significant areas of flood risk within the periphery of Halton (see water management Figure D.35).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The central urban extent of Halton is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.36).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Halton is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Halton periphery should allow enough land for attenuation storage.

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Water cycle element Analysis Assessment

Water quality Halton is served by Aylesbury WwTW which is operated by Thames Water. The WwTW capacity environmental limits other settlements served by the Aylesbury WwTW include Aylesbury, Aston and wastewater Clinton, Buckland, Drayton Beauchamp, Halton, Hardwick, Hulcott, Weedon treatment capacity and Marsh Gibbon. Upper limit

The sewage flows from this development will be discharged at Aylesbury STW, which has capacity for an additional 9,000 properties or 22,000 domestic population equivalent without requiring upgrades.

The combined upper limit (12,300 properties) surpasses the capacity of Aylesbury STW requiring upgrades to be undertaken. These upgrades can only be undertaken in 2020-2025 or 2025-2030 (AMP7 or 8).

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Water cycle element Analysis Assessment

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for Network infrastructure capacity water supply and have identified that water supply network capacity for Halton capacity is Green. Green This would be a more preferable location for a development of 100 properties within the Aylesbury drainage system. Although it feeds into the northern trunk sewer, it avoids the issues at Aston Clinton by connecting downstream of this hotspot.

The current assets should be able to accommodate growth on this magnitude; however development to the north of the town would be preferred due to sewer size in that area. Due to the development of ARLA in Aston Clinton, the network is under increased strain. With the existing network asset in place, growth over 100 properties is a figure for concern.

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8.4.18 Hardwick

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Thame tributary which flows surface water from East to South on the south periphery of Hardwick. Any development within management the Environment Agency flood zones (see Figure D.37) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South East periphery of Hardwick is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.38).

The SuDS potential map (Appendix E) identifies that the majority of the Hardwick periphery is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The North periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Hardwick periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Hardwick is served by Aylesbury WwTW which is operated by Thames Water. WwTW environmental limits The other settlements served by the Aylesbury WwTW include Aylesbury, Aston capacity and wastewater Clinton, Buckland, Drayton Beauchamp, Halton, Hardwick, Hulcott, Weedon and treatment capacity Marsh Gibbon. Upper limit The minimum housing growth scenario being tested through this study is 5910, and

the maximum is 12300. This is in addition to a total of 4942 properties that have Red planning permission that have not yet been built.

Aylesbury WwTW discharges into the River Thame (Aylesbury to Scotgrove Lower limit Brook). The River Thame (Aylesbury to Scotgrove Brook) is not a designated

Waterbody and the current overall status is Poor, Phosphate status is poor, Green Ammonia and Dissolved Oxygen status is high.

The sewage flows from this development will be discharged at Aylesbury STW, which has capacity for an additional 9,000 properties or 22,000 domestic population equivalent without requiring upgrades.

The combined upper limit (12,300 properties) surpasses the capacity of Aylesbury STW requiring upgrades to be undertaken. These upgrades can only be undertaken in 2020-2025 or 2025-2030 (AMP7 or 8).

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Water cycle Analysis Assessment element

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Upper limit infrastructure settlement, and have identified that network capacity in this settlement is Amber Amber capacity for the upper limit and green for the lower limit.

There is no known history or foul flooding in Hardwick, and there are no combined Lower limit sewer overflows.

Green This development must be considered in parallel with Weedon Hill as they merge into one network. There may be sufficient capacity for up to 100 properties in the existing network. However a study is required to confirm this assumption.

Thames Water prefer the development to be located north east or south east of the town to connect into the existing 150mm sewer.

Thames Water cannot advise of the scale or location of any improvements that may be required until such time as detailed development locations and property numbers are known. Typically, Thames Water estimate wastewater network infrastructure takes between 18 months and three years to plan and deliver. However, in some cases it can take longer than this, and as described in section 3.3, Thames Water may sometimes request a Grampian Condition to protect existing customers from the risk of foul flooding.

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Water cycle Analysis Assessment element

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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8.4.19 Hulcott

Water cycle Analysis Assessment element

There are significant areas of flood risk on the River Thame tributary Floodplain Flood risk and surface which flows East to West on the North periphery of Hulcott. Any development water management within the Environment Agency flood zones (see Figure D.39) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South periphery of Hulcott is less susceptible to groundwater flooding than the remainder of the periphery (see Figure D.40).

The SuDS potential map (Appendix E) identifies that the majority of the Hulcott periphery is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. There are pockets in the North and South periphery which are underlain by medium permeable soil and are identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Hulcott periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Hulcott is served by Aylesbury WwTW which is operated by Thames Water. The WwTW environmental limits other settlements served by the Aylesbury WwTW include Aylesbury, Aston capacity and wastewater Clinton, Buckland, Drayton Beauchamp, Halton, Hardwick, Hulcott, Weedon and treatment capacity Marsh Gibbon. Upper limit The minimum housing growth scenario being tested through this study is 5910, and

the maximum is 12300. This is in addition to a total of 4942 properties that have Red planning permission that have not yet been built.

Aylesbury WwTW discharges into the River Thame (Aylesbury to Scotgrove Lower limit Brook). The River Thame (Aylesbury to Scotgrove Brook) is not a designated

Waterbody and the current overall status is Poor, Phosphate status is poor, Green Ammonia and Dissolved Oxygen status is high.

The sewage flows from this development will be discharged at Aylesbury STW, which has capacity for an additional 9,000 properties or 22,000 domestic population equivalent without requiring upgrades.

The combined upper limit (12,300 properties) surpasses the capacity of Aylesbury STW requiring upgrades to be undertaken. These upgrades can only be undertaken in 2020-2025 or 2025-2030 (AMP7 or 8).

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Water cycle Analysis Assessment element

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Upper limit infrastructure settlement, and have identified that network capacity in this settlement is Amber capacity for the upper limit and green for the lower limit. Amber

There is sufficient capacity without requiring upgrades for a maximum of 100

properties for the drainage to Aylesbury rather than Rowsham, which will connect into a 150mm sewer.

However this also depends on the level of developments feeding into the main Lower limit Aylesbury northern trunk sewer, and may require a full upgrade for the trunk

sewer. Green

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Water cycle Analysis Assessment element

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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8.4.20 Ashendon

Water cycle Analysis Assessment element

Flood risk and surface There are significant areas of flood risk on the River Thame tributary to the North water management and West periphery of Ashendon. Any development within the Environment Agency flood zones (see Figure D.1) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North West periphery of Ashendon is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.2).

The SuDS potential map (Appendix E) identifies that the majority of Ashendon periphery is underlain by medium permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Ashendon periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Ashendon is served by Aylesbury WwTW which is operated by Thames Water. WwTW capacity environmental limits The other settlements served by the Aylesbury WwTW include Aylesbury, Aston and wastewater Clinton, Buckland, Drayton Beauchamp, Halton, Hardwick, Hulcott, Weedon and treatment capacity Marsh Gibbon. Upper limit

The minimum housing growth scenario being tested through this study is 5910, and Red the maximum is 12300. This is in addition to a total of 4942 properties that have planning permission that have not yet been built. Lower limit Aylesbury WwTW discharges into the River Thame (Aylesbury to Scotgrove

The sewage flows from this development will be discharged at Aylesbury STW, which has capacity for an additional 9,000 properties or 22,000 domestic population equivalent without requiring upgrades.

The combined upper limit (12,300 properties) surpasses the capacity of Aylesbury STW requiring upgrades to be undertaken. These upgrades can only be undertaken in 2020-2025 or 2025-2030 (AMP7 or 8).

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Water cycle Analysis Assessment element

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Upper limit infrastructure capacity settlement, and have identified that network capacity in this settlement is Red for Red the upper limit and green for the lower limit.

The existing network has capacity for 20-30 additional properties only which can be Lower limit located to the north of the town. Provision of properties higher than 30 would require upgrading of the network to meet the increased flow. This may be in the Green form of a dedicated sewer to the Ashdon STW.

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Water cycle Analysis Assessment element

Water supply network Thames Water have identified that there is no absolute water resource constraint in Network infrastructure capacity Aylesbury Vale, but this is based on an assumption that new build properties will capacity achieve the water efficiency standards equivalent to CSH level 3 or 4. Amber Thames Water Services have undertaken a Red Amber Green Assessment for water supply and have identified that water supply network capacity for Wendover is

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

8.4.21 Cheddington

Water cycle element Analysis Assessment

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Water cycle element Analysis Assessment

Flood risk and surface There are no significant areas of flood risk in the periphery of Cheddington (see water management Figure D15).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South periphery of Cheddington is less susceptible to groundwater flooding than the remainder of the periphery (see Figure D.16).

The SuDS potential map (Appendix E) identifies that the majority of the Cheddington periphery is underlain by medium permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Cheddington periphery should allow enough land for attenuation storage.

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Water cycle element Analysis Assessment

Water quality Ashendon is served by Aylesbury WwTW which is operated by Thames Water. WwTW environmental limits The other settlements served by the Aylesbury WwTW include Aylesbury, Aston capacity and wastewater Clinton, Buckland, Drayton Beauchamp, Halton, Hardwick, Hulcott, Weedon treatment capacity and Marsh Gibbon. Upper limit The minimum housing growth scenario being tested through this study is 5910,

and the maximum is 12300. This is in addition to a total of 4942 properties that Red have planning permission that have not yet been built.

Aylesbury WwTW discharges into the River Thame (Aylesbury to Scotgrove Lower limit Brook). The River Thame (Aylesbury to Scotgrove Brook) is not a designated

Waterbody and the current overall status is Poor, Phosphate status is poor, Green Ammonia and Dissolved Oxygen status is high.

The sewage flows from this development will be discharged at Aylesbury STW, which has capacity for an additional 9,000 properties or 22,000 domestic population equivalent without requiring upgrades.

The combined upper limit (12,300 properties) surpasses the capacity of Aylesbury STW requiring upgrades to be undertaken. These upgrades can only be undertaken in 2020-2025 or 2025-2030 (AMP7 or 8).

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Water cycle element Analysis Assessment

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for Network infrastructure capacity this settlement, and have identified that network capacity in this settlement is capacity Red for the upper limit and Red for the lower limit. This is because there in no Red capacity in the existing network to accept any flows; any development would require upgrading the network to accommodate additional flows.

Thames Water considers that the wastewater network capacity requires major infrastructure extensions to be delivered through business planning process. At least five years required is required to plan, fund and deliver infrastructure.

Thames Water would require a level of confidence and certainty around the progression of growth in this area in advance, in order to be able to include upgrading the STW as a project in its submission for funding.

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8.4.22 Chilton

Water cycle Analysis Assessment element

Flood risk and surface There are significant areas of flood risk on the River Thame tributary which flows water management from North to South on the East periphery of Chilton. Any development within the Environment Agency flood zones (see Figure D.17) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The East periphery of Chilton is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.18).

The SuDS potential map (Appendix E) identifies that the southern periphery of Chilton is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The North periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Chilton periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Chilton is served by Chilton (Bucks) WwTW which is operated by Thames Water. WwTW capacity environmental limits and wastewater The minimum housing growth scenario being tested through this study is 20, and treatment capacity the maximum is 100. There are no additional properties that have planning Upper limit permission yet to be built.

Red Thames Water Services have undertaken a Red Amber Green Assessment for this settlement, and have identified that wastewater treatment infrastructure capacity in this settlement is Red for the upper limit and Amber for the lower limit. Lower limit

Initial calculations carried out following an approach agreed with Thames Water Amber identify that there is capacity at the WwTW approximately an additional 10-15 properties.

Chilton (Bucks) WwTW discharges into the Peppershill and Shabbington Brooks. The current overall status is poor, with Fish status unknown, Ammonia status is high, Dissolved Oxygen status is moderate and the Phosphate status is poor.

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Upper limit infrastructure capacity settlement, and have identified that network capacity in this settlement is Amber Amber for the upper limit and green for the lower limit.

There is capacity for the lower development limit of 20 properties in the existing Lower limit network through a 150mm sewer that feeds the Chilton (Buck) STW. Based on the population of Chilton and the business units within the catchment, it is advised Green that the lower limit is acceptable; however the upper limit would require a detailed study.

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Water cycle Analysis Assessment element

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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8.4.23 Chearsley

Water cycle Analysis Assessment element

Flood risk and surface There are significant areas of flood risk on the River Thame and its tributaries on water management the East and West periphery of Chearsley. Any development within the Environment Agency flood zones (see Figure D.13) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South East periphery of Chearsley is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.14).

The SuDS potential map (Appendix E) identifies that the majority of the Chearsley periphery is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. There are areas in the South periphery underlain by medium permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Chearsley periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Chearsley is served by Cuddington WwTW which is operated by Thames Water. WwTW capacity environmental limits The other settlement served by the Cuddington WwTW is Cuddington. Upper limit and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 40, and the maximum is 200. This is in addition to a total of four properties that have Amber

planning permission that have not yet been built. Lower limit Thames Water Services have undertaken a Red Amber Green Assessment for this settlement, and have identified that wastewater treatment infrastructure capacity in Green this settlement is Amber for the upper limit and green for the lower limit.

This STW is also proposed to receive flows from the Cuddington development which has the same lower and upper limits as Chearsley of 20 and 100 respectively. Cuddington STW has capacity to accept the combined lower development limits; however the maximum upper limits from each development will have to be 50 additional properties with anything higher than this requiring upgrade to the STW. Alternatively only one development will have to be progressed at the upper limit.

Cuddington WwTW discharges into the River Thame (Aylesbury to Scotgrove Brook). The River Thame (Aylesbury to Scotgrove Brook) is not a designated Waterbody and the current overall status is Poor, with Fish status unknown, Phosphate status is poor, Ammonia and Dissolved Oxygen status is high.

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Upper limit infrastructure capacity settlement, and have identified that network capacity in this settlement is Amber, Red and that the ability to provide additional infrastructure if required is Red for the upper limit and Green for the lower limit.

Lower limit Due to the size of the draining sewer, there is a maximum number of properties that can be added without causing hydraulic issues. It is advised that a 20 property Green limit be placed on this settlement. Thames Water would require a study to look into this if it were a site for serious consideration

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Water cycle Analysis Assessment element

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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8.4.24 Cuddington

Water cycle Analysis Assessment element

Flood risk and surface There are significant areas of flood risk on the River Thame which flows from water management North East to South West on the South periphery of Cuddington. Any development within the Environment Agency flood zones (see Figure D.23) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North periphery of Cuddington is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.24).

The SuDS potential map (Appendix E) identifies that the South periphery of Cuddington is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The North periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Cuddington periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Cuddington is served by Cuddington WwTW which is operated by Thames Water. WwTW capacity environmental limits The other settlement served by the Cuddington WwTW is Chearsley. Upper limit and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 40, and the maximum is 200. This is in addition to a total of four properties that have Amber

This STW is also proposed to receive flows from the Chearsley development which has the same lower and upper limits as Cuddington of 20 and 100 respectively. The Cuddington STW has capacity to accept the combined lower development limits; however the maximum upper limits from each development will have to be 50 additional properties with anything higher than this requiring upgrade to the STW. Alternatively only one development will have to be progressed at the upper limit.

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Upper limit infrastructure capacity settlement, and have identified that network capacity in this settlement is Amber Amber for the upper limit and green for the lower limit.

There is no known history or foul flooding in Cuddington. If the development is Lower limit located to the eastern part of the town then there is sufficient capacity in the existing network to support the proposed development. A further study will be Green required if the development is located anywhere else.

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Water cycle Analysis Assessment element

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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8.4.25 Grendon Underwood

Water cycle Analysis Assessment element

Flood risk and surface There are significant areas of flood risk on the River Ray which flows from East to water management West on the North and West periphery of Grendon Underwood. Any development within the Environment Agency flood zones (see Figure D.31) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South periphery of Grendon Underwood is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.32).

The SuDS potential map (Appendix E) identifies that the majority of the periphery of Grendon Underwood is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. Any development within the Grendon Underwood periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Grendon Underwood is served by Grendon Underwood WwTW which is operated WwTW capacity environmental limits by Thames Water. This WwTW also serves the Kingswood settlement. Upper limit and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 40, and the maximum is 200. This is in addition to 17 properties that have planning Red

permission which are yet to be built. Lower limit The sewage flows from this development are discharged into Grendon Underwood STW which has capacity to accept the 20 additional properties; anything higher Amber would require infrastructure upgrades. This STW is also proposed to receive flows

from the Kingswood development which has the same lower and upper limits as Grendon Underwood of 20 and 100 respectively. Thames Water Services have undertaken a Red Amber Green Assessment for this settlement, and have identified that wastewater treatment infrastructure capacity in this settlement is Red for the upper limit and Amber for the lower limit.

There is currently a refurbishment scheme at Grendon Underwood STW which has been delayed due to environmental concerns. This has compromised the site capacity and performance.

Please note: if the preferred location is north west of the town, then there is a potential that it may drain to Marsh Gibbon STW, as Grendon Underwood SPS actually drains to this works.

Grendon Underwood WwTW discharges into the River Ray and tributaries North East of Grendon Underwood. The current overall status is moderate, with Fish status unknown, Ammonia status is good, Dissolved Oxygen status is moderate and the Phosphate status is poor.

There is currently no capacity in the existing network to support this development Lower limit and a study will be required if the development is located anywhere else.

Amber Thames Water considers that the development upper limit would require major extensions to be delivered through the business planning process and at least five years to plan, fund and deliver infrastructure.

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Water cycle Analysis Assessment element

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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8.4.26 Kingswood

Water cycle Analysis Kingswood element

Flood risk and surface There are significant areas of flood risk on the Tetchwick Brook which flows East to water management West on the South periphery of Kingswood. Any development within the Environment Agency flood zones (see Figure D.45) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The East periphery of Kingswood is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.46).

The SuDS potential map (Appendix E) identifies that the majority of the Kingswood periphery is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. Any development within the Kingswood periphery should allow enough land for attenuation storage.

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Water cycle Analysis Kingswood element

Water quality Kingswood is served by Grendon Underwood WwTW which is operated by WwTW environmental limits Thames Water. This WwTW also serves the Grendon Underwood settlement. capacity and wastewater Upper limit treatment capacity The minimum housing growth scenario being tested through this study is 40, and the maximum is 200. This is in addition to 17 properties that have planning permission which are yet to be built. Red

Thames Water Services have undertaken a Red Amber Green Assessment for this Lower limit settlement, and have identified that wastewater treatment infrastructure capacity in this settlement is Red for the upper limit and Amber for the lower limit. However, Amber for the combined developments served by the Grendon Underwood STW the

capacity is Red for the upper limit and Amber for the lower limit.

Please note: if the preferred location is north west of the town, then there is a potential that it may drain to Marsh Gibbon STW, as Grendon Underwood SPS actually drains to this works.

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Upper limit infrastructure settlement, and have identified that network capacity in this settlement is Red for Red capacity the upper limit and Amber for the lower limit.

There is no known history or foul flooding in Kingswood. There is currently no Lower limit capacity in the existing network to support this development and a drainage study will be required. Amber

Thames Water considers that the development would require major extensions to be delivered through the business planning process and at least five years to plan, fund and deliver infrastructure.

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Water cycle Analysis Kingswood element

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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8.4.27 Long Crendon

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Thame which flows from East surface water to South West on the South periphery of Long Crendon. Any development within management the Environment Agency flood zones (see Figure D.47) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South East periphery of Long Crendon is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.48).

The SuDS potential map (Appendix E) identifies that the outer periphery of Long Crendon is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The inner periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Long Crendon periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Long Crendon is served by Long Crendon WwTW which is operated by Thames Upper limit environmental limits Water. Amber and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 20, and the maximum is 100. This is in addition to a total of six properties that have Lower limit planning permission that have not yet been built.

Green There is currently an ongoing refurbishment scheme at the STW, due to be finished mid 2012 which will determine any additional properties that it can accommodate. Therefore developments which include Long Crendon, around this catchment will have to wait for this scheme to complete.

Long Crendon WwTW discharges into the River Thame (Aylesbury to Scotgrove Brook). The River Thame (Aylesbury to Scotgrove Brook) is not a designated Waterbody and the current overall status is Poor, with Fish status unknown, Phosphate status poor, Ammonia and Dissolved Oxygen status high.

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Upper limit infrastructure settlement, and have identified that network capacity in this settlement is Amber AmbeAmberr capacity for the upper limit and green for the lower limit.

If the development is located to the eastern part of the town then there is sufficient Lower limit capacity in the existing network to support the proposed development. A further study will be required if the development is located anywhere else. Green

Water supply Thames Water Services have undertaken a Red Amber Green Assessment for water Network network supply and have identified that water supply network capacity for Long Crendon capacity infrastructure is Green. Depending upon the location of the development some short lengths of Green capacity reinforcement main maybe required within the village but as a whole there is capacity for 100 properties.

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8.4.28 Ludgershall

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Ray tributaries on the North surface water periphery of Ludgershall. Any development within the Environment Agency flood management zones (see Figure D.49) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South periphery of Ludgershall is less susceptible to groundwater flooding than the remainder of the periphery (see Figure D.50).

The SuDS potential map (Appendix E) identifies that the southern periphery of Ludgershall is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. Any development within the Ludgershall periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Ludgershall is served by Ludgershall WwTW which is operated by Thames Water. Upper limit environmental limits Red and wastewater The minimum housing growth scenario being tested through this study is 20, and treatment capacity the maximum is 100. This is in addition a property that has planning permission which is yet to be built. Lower limit

Initial calculations carried out by Thames Water identify that there is capacity for Green up to an additional 25 properties.

Ludgershall WwTW discharges into the Ludgershall Brook and Muswellhill Brook. The current overall status is poor, with Fish, Ammonia, Dissolved Oxygen and Phosphate status unknown.

Wastewater network No assessment was provided by Thames Water. infrastructure capacity New developments must be separately sewered, with surface water not being discharged into the combined or foul system. The Flood and Water Management Act contains a provision making the right to connect to public surface water sewer conditional on the drainage system being approved by the SAB. Therefore any redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment and drainage strategy discussed above.

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Water cycle Analysis Assessment element

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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8.4.29 Marsworth

Water cycle Analysis Assessment element

Flood risk and surface There are significant areas of flood risk on the Grand Union Canal Floodplain on water management the west periphery of Marsworth and on the Startopsend Reservoir and Tringford Reservoir (Grand Union Canal) fllodplains. Any development within the Environment Agency flood zones (see Figure D.51) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South periphery of Marsworth is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.52).

The SuDS potential map (Appendix E) identifies that the majority of the Marsworth periphery is underlain by medium permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Marsworth periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Marsworth is served by Aylesbury WwTW which is operated by Thames Water. WwTW capacity environmental limits The other settlements served by the Aylesbury WwTW include Aylesbury, Aston and wastewater Clinton, Buckland, Drayton Beauchamp, Halton, Hardwick, Hulcott, Weedon and treatment capacity Marsh Gibbon. Upper limit

The sewage flows from this development will be discharged at Aylesbury STW, which has capacity for an additional 9,000 properties or 22,000 domestic population equivalent without requiring upgrades.

The combined upper limit (12,300 properties) surpasses the capacity of Aylesbury STW requiring upgrades to be undertaken. These upgrades can only be undertaken in 2020-2025 or 2025-2030 (AMP7 or 8).

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Upper limit infrastructure capacity settlement, and have identified that network capacity in this settlement is Amber for the upper limit and green for the lower limit. Amber

New developments must be separately sewered, with surface water not being

discharged into the combined or foul system. The Flood and Water Management Act contains a provision making the right to connect to public surface water sewer conditional on the drainage system being approved by the SAB. Therefore any redevelopment must ensure an appropriate destination for discharge of surface Lower limit water. This will need to be considered in the development Flood risk assessment

and drainage strategy discussed above. Green

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Water cycle Analysis Assessment element

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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8.4.30 Boarstall

Water cycle Analysis Assessment element

Flood risk and surface There are significant areas of flood risk on the Danes Brook Floodplain which flows water management from East to West on the South periphery of Boarstall. Any development within the Environment Agency flood zones (see Figure D.7) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South periphery of Boarstall is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.8).

The SuDS potential map (Appendix E) identifies that the outer periphery of Boarstall is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The inner periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Boarstall periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Thames Water Services have undertaken a Red Amber Green Assessment for this environmental limits settlement, and have identified that wastewater treatment infrastructure capacity in Upper limit and wastewater this settlement is Red for the upper limit and Amber for the lower limit. treatment capacity Red Boarstall does not currently drain to any STW; of the three nearest locations,

Ludgershall STW has capacity of only 25 additional properties or 60 domestic population equivalent. This STW is also proposed to receive flows from the Lower limit Ludgershall development with the same development limits of 20 and 100 properties. Either of the two developments will be supported by the STW at the Amber lower limit of 20 properties without requiring upgrades. Any additional properties

higher than 25 will require the STW to be upgraded.

There is no public sewerage system or wastewater treatment works in Boarstall. Wastewater network There may be opportunities to combine development with a first time rural infrastructure sewerage scheme (Section 101a under the Water Industry Act) if there are known capacity environmental issues caused by the lack of a sewerage system in Boarstall. However, the requirements for Section 101a schemes require a rigourous cost benefit appraisal, and the schemes must meet strict requirements that are only met in the most severe cases of environmental impact.

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Water cycle Analysis Assessment element

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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8.4.31 Shabbington

Water cycle Analysis Assessment element

Flood risk and surface There are significant areas of flood risk on the River Thame and its tributaries water management Floodplain on the west periphery of Shabbington. Any development within the Environment Agency flood zones (see Figure D.65) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North periphery of Shabbington is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.66).

The SuDS potential map (Appendix E) identifies majority of the Shabbington periphery is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The north periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Shabbington periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Shabbington is served by Shabbington WwTW which is operated by Thames environmental limits Water. Upper limit and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 20, and Red the maximum is 100. There is an additional property that has planning permission

which is yet to be built. Lower limit Thames Water Services have undertaken a Red Amber Green Assessment for this settlement, and have identified that wastewater treatment infrastructure capacity in Red this settlement is red for both the upper and lower limits.

Shabbington WwTW discharges into the Peppershill and Shabbington Brooks. The current overall status is poor, with Fish status unknown, Ammonia status high, Dissolved Oxygen status moderate and the Phosphate status poor. There is no information on the mitigation measures assessment.

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for water infrastructure capacity supply and have identified that there is theoretical capacity for up to 100 dwellings, Upper limit and therefore the assessment is Green. Green Thames Water would prefer the location for development to the East of the town, to

connect into a larger diameter sewer. This may not need to be adhered to depending on the level of growth. Lower limit

New developments must be separately sewered, with surface water not being Green discharged into the combined or foul system. The Flood and Water Management

Act contains a provision making the right to connect to public surface water sewer conditional on the drainage system being approved by the SAB. Therefore any redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment and drainage strategy discussed above.

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Water cycle Analysis Assessment element

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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8.4.32 Dinton

Water cycle Analysis Assessment element

Flood risk and surface There are significant areas of flood risk on the River Thame tributary which flows water management from East to South on the East periphery of Dinton. Any development within the Environment Agency flood zones (see Figure D.25) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The SuDS potential map (Appendix E) identifies majority of the Dinton periphery is underlain by permeable soil and is identified as being suitable for SuDS. However the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited. The South periphery is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. Hence any development within the Dinton periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Dinton is served by Stone WwTW which is operated by Thames Water. Upper limit environmental limits Amber and wastewater The minimum housing growth scenario being tested through this study is 20, and treatment capacity the maximum is 100. This is in addition to 12 properties that have planning permission which are yet to be built. Lower limit

Thames Water Services have undertaken a Red Amber Green Assessment for this Green settlement, and have identified that wastewater treatment infrastructure capacity in this settlement is Amber for the upper limit and green for the lower limit.

Stone WwTW discharges into the Scotgrove Brook (upstream Kingsey Cuttle Brook). The current overall status is poor, with no Fish status. The Ammonia status is high, Dissolved Oxygen status is good and the Phosphate status is poor.

New developments must be separately sewered, with surface water not being Lower limit discharged into the combined or foul system. The Flood and Water Management Act contains a provision making the right to connect to public surface water sewer Green conditional on the drainage system being approved by the SAB. Therefore any redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment and drainage strategy discussed above.

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Water cycle Analysis Assessment element

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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8.4.33 Quainton

Water cycle element Analysis Assessment

Flood risk and surface There are no significant areas of flood risk in the periphery of Quainton (see water management Figure D.61.

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South periphery of Quainton is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.62).

The SuDS potential map (Appendix E) identifies majority of the Quainton periphery is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The North periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Quainton periphery should allow enough land for attenuation storage.

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Water quality Quainton is served by Waddesdon WwTW which is operated by Thames Water. Upper limit environmental limits This WwTW also serves the Waddesdon settlement. Red and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 40, and the maximum is 200. This is in addition to 17 properties that have planning Lower limit permission which are yet to be built.

Green Thames Water Services have undertaken a Red Amber Green Assessment for this settlement, and have identified that wastewater treatment infrastructure capacity in this settlement is Amber for the upper limit and Green for the lower limit. However, for the combined developments served by the Waddesdon STW the capacity is Red for the upper limit and Green for the lower limit.

Waddesdon WwTW discharges into Fleet Marston Brook, Denham Brook, Pitchcott Brook west. The current overall status is poor, with a poor status Fish. The Ammonia status is moderate, Dissolved Oxygen status is good and the Phosphate status is bad.

Thames Water would prefer the location for development to the South or the Lower limit East of the town.

Green New developments must be separately sewered, with surface water not being discharged into the combined or foul system. The Flood and Water Management Act contains a provision making the right to connect to public surface water sewer conditional on the drainage system being approved by the SAB. Therefore any redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment and drainage strategy discussed above.

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8.4.34 Waddesdon

Water cycle element Analysis Assessment

Flood risk and surface There are no significant areas of flood risk in the periphery of Waddesdon (see water management Figure D.69).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The South periphery of Waddesdon is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.70).

The SuDS potential map (Appendix E) identifies majority of the Waddesdon periphery is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The North periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Waddesdon periphery should allow enough land for attenuation storage.

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Water cycle element Analysis Assessment

Water quality Waddesdon is served by Waddesdon WwTW which is operated by Thames Upper limit environmental limits Water. This WwTW also serves the Quainton settlement. Red and wastewater treatment capacity The minimum housing growth scenario being tested through this study is 40, and the maximum is 200. This is in addition to 17 properties that have planning Lower limit permission which are yet to be built.

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Upper limit infrastructure capacity settlement, and have identified that network capacity in this settlement is Green Green for the both the upper limit and lower limits.

If short lengths of reinforcement main are needed, they will be delivered through Lower limit the developer requisition process, and the typical time for delivery through the standard requisition process is 12 to 24 months. Green

Thames Water would prefer the location for development to the North of the town, so as to connect into a larger diameter sewer.

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Water cycle element Analysis Assessment

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8.4.35 Westcott

Water cycle Analysis Assessment element

Flood risk and surface There are significant areas of flood risk on the Tramroad Ditch Floodplain which water management flows from South East to South West on the South West periphery of Westcott. Any development within the Environment Agency flood zones (see Figure D.77) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North Westcott periphery is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.78).

The SuDS potential map (Appendix E) identifies majority of the Westcott periphery is underlain by permeable soil and is identified as being suitable for SuDS. The south east periphery is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Westcott periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality The flows from this development will be discharged at Westcott STW which is a environmental limits private works. Consultation with the owner will be required to ascertain if there is and wastewater any available capacity. treatment capacity

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for waste infrastructure capacity water network and have identified that wastewater network capacity for Westcott Green is Green. Depending upon the location of the development some short lengths of reinforcement main maybe required within the village but as a whole there is capacity for 100 properties.

However the terminal pumping station for the sewage works is private; the owner of the private terminal pumping station will need to be consulted to ascertain if the additional properties can be accommodated.

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Water cycle Analysis Assessment element

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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8.4.36 Oakley

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Thame tributary which flows surface water from North to South on the South periphery of Oakley. Any development within management the Environment Agency flood zones (see Figure D. 55) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The East periphery of Oakley is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.56).

The SuDS potential map (Appendix E) identifies majority of the Oakley periphery is underlain by permeable soils and is identified as being suitable for SuDS. However the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited. Small pocket areas to the east of Oakley are underlain on impermeable soils or strata and that any development will require land set aside for SuDS attenuation. Any development within the Oakley periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Oakley is served by Worminghall WwTW which is operated by Thames Water. Upper limit environmental limits The other settlements served by the Worminghall WwTW include Worminghall, and wastewater Brill and Ickford. Amber treatment capacity The minimum housing growth scenario being tested through this study is 80, and

the maximum is 400. This is in addition to a total of 43 properties that have planning permission that have not yet been built.

Thames Water Services have undertaken a Red Amber Green Assessment for this Lower limit settlement, and have identified that wastewater treatment infrastructure capacity in

this settlement is Amber for the upper limit and green for the lower limit. This is Green also the same assessment for the combined developments served by the Worminghall STW the capacity is Amber for the upper limit and Green for the lower limit.

Worminghall WwTW discharges into the Worminghall Brook. The current overall status is Moderate, with Fish status unknown, Phosphate status poor, Ammonia status good and Dissolved Oxygen status high.

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for infrastructure wastewater network and have identified that wastewater network capacity for Green capacity Oakley is Green.

Both Brill and Oakley combine and drain to Worminghall STW. The existing network has capacity for 100 properties each at both Brill and Oakley.

Thames Water have advised that their assessment is based on each site individually. If the council plan to permit development develop at all / numerous sites that discharge into Worminghall works, then Thames Water would need to be consulted on the detail in order to provide accurate details of capacity.

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Water cycle Analysis Assessment element

Water supply Thames Water Services have undertaken a Red Amber Green Assessment for water Green network supply and have identified that water supply network capacity for Oakley is Green. infrastructure Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is capacity for 100 properties.

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8.4.37 Worminghall

Water cycle Analysis Assessment element

Flood risk and surface There are significant areas of flood risk on the River Thame tributary which flows water management from North East to South West on the East periphery of Worminghall. Any development within the Environment Agency flood zones (see Figure D.85) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The East periphery of Worminghall is more susceptible to groundwater flooding than the remainder of the periphery (see Figure D.86).

The SuDS potential map (Appendix E) identifies majority of the Worminghall periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Worminghall periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Worminghall is served by Worminghall WwTW which is operated by Thames Water quality Water. The other settlements served by the Worminghall WwTW include Upper limit environmental limits Worminghall, Brill and Ickford. and wastewater Amber treatment capacity The minimum housing growth scenario being tested through this study is 80, and the maximum is 400. This is in addition to a total of 43 properties that have

planning permission that have not yet been built.

Thames Water Services have undertaken a Red Amber Green Assessment for this settlement, and have identified that wastewater treatment infrastructure capacity in Lower limit this settlement is Amber for the upper limit and green for the lower limit. This is

also the same assessment for the combined developments served by the Green Worminghall STW the capacity is Amber for the upper limit and Green for the lower limit.

Worminghall WwTW discharges into the Worminghall Brook. The current overall status is Moderate, with Fish status unknown, Phosphate status is poor, Ammonia status good and Dissolved Oxygen status high.

Wastewater network The arrangement at Worminghall is such that a study would need to be undertaken Upper limit infrastructure in order to understand the true implications of any major growth. The pumping capacity station that feeds Worminghall works from this location is fed by 2 gravity sewers Amber and a rising main from Ickford.

New developments must be separately sewered, with surface water not being Green discharged into the combined or foul system. The Flood and Water Management Act contains a provision making the right to connect to public surface water sewer conditional on the drainage system being approved by the SAB. Therefore any redevelopment must ensure an appropriate destination for discharge of surface water. This will need to be considered in the development Flood risk assessment and drainage strategy discussed above.

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Water cycle Analysis Assessment element

Water supply Thames Water Services have undertaken a Red Amber Green Assessment for water Green network supply and have identified that water supply network capacity for Worminghall is infrastructure Green. Depending upon the location of the development some short lengths of capacity reinforcement main maybe required within the village but as a whole there is capacity for 100 properties.

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8.4.38 Brill

Water cycle element Analysis Assessment

Flood risk and surface There are no significant areas of flood risk in the periphery of Brill (see Figure water management D.9).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North East periphery of Brill is less susceptible to groundwater flooding than the remainder of the periphery (see Figure D.10).

The SuDS potential map (Appendix E) identifies majority of the Brill periphery is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. The outer and North East periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Brill periphery should allow enough land for attenuation storage.

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Water cycle element Analysis Assessment

Worminghall is served by Worminghall WwTW which is operated by Thames Water quality Water. The other settlements served by the Worminghall WwTW include Oakley, Upper limit environmental limits Brill and Ickford. and wastewater Amber treatment capacity The minimum housing growth scenario being tested through this study is 80, and the maximum is 400. This is in addition to a total of 43 properties that have

planning permission that have not yet been built.

Thames Water Services have undertaken a Red Amber Green Assessment for this settlement, and have identified that wastewater treatment infrastructure capacity Lower limit in this settlement is Amber for the upper limit and green for the lower limit. This

is also the same assessment for the combined developments served by the Green Worminghall STW the capacity is Amber for the upper limit and Green for the lower limit.

Worminghall WwTW discharges into the Worminghall Brook. The current overall status is Moderate, with Fish status unknown, Phosphate status poor, Ammonia status good and Dissolved Oxygen status high.

Green Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for infrastructure capacity water supply and have identified that wastewater network capacity for Brill is Green.

Both Brill and Oakley combine and drain to Worminghall STW. The existing network has capacity for 100 properties each at both Brill and Oakley. Although Brill can likely accommodate 100 properties, anything more and the network would be reaching capacity.

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Water cycle evidence for the Vale of Aylesbury Plan Sustainable settlement analysis

Water cycle element Analysis Assessment

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8.4.39 Ickford

Water cycle Analysis Assessment element

Flood risk and There are significant areas of flood risk on the River Thame tributaries on the surface water periphery of Ickford. Any development within the Environment Agency flood management zones (see Figure D.41) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The whole of the Ickford periphery is susceptible to groundwater flooding. (See Figure D.42).

The SuDS potential map (Appendix E) identifies majority of the Ickford periphery is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Ickford periphery should allow enough land for attenuation storage.

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Water cycle evidence for the Vale of Aylesbury Plan Sustainable settlement analysis

Water cycle Analysis Assessment element

Water quality Ickford is served by Worminghall WwTW which is operated by Thames Water. Upper limit environmental limits The other settlements served by the Worminghall WwTW include Worminghall, and wastewater Brill and Oakley. Amber treatment capacity The minimum housing growth scenario being tested through this study is 80, and

the maximum is 400. This is in addition to a total of 43 properties that have planning permission that have not yet been built.

Thames Water Services have undertaken a Red Amber Green Assessment for this Lower limit settlement, and have identified that wastewater treatment infrastructure capacity in

Worminghall WwTW discharges into the Worminghall Brook. The current overall status is Moderate, with Fish status unknown, Phosphate status poor, Ammonia status good and Dissolved Oxygen status high.

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Upper limit infrastructure settlement, and have identified that network capacity in this settlement is Red for capacity the upper limit and Amber for the lower limit. Red

There is currently no capacity in the existing network to support this development Lower limit and a study will be required if the development can located anywhere else or understand the impacts of the proposed growth. Amber

Thames Water considers that the development would require major extensions to be delivered through the business planning process and at least five years to plan, fund and deliver infrastructure.

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Water cycle Analysis Assessment element

Water supply Thames Water Services have undertaken a Red Amber Green Assessment for water network supply and have identified that water supply network capacity for Ickford is Green. infrastructure Depending upon the location of the development some short lengths of Green capacity reinforcement main maybe required within the village but as a whole there is capacity for 100 properties.

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8.4.40 Weedon

Water cycle Analysis Assessment element

Flood risk and surface There are significant areas of flood risk on the River Thame tributaries Floodplains water management on the North West and South East periphery of Weedon. Any development within the Environment Agency flood zones (see Figure D.71) will be subject to a sequential testing and then possibly further exception testing as described in the National Planning Policy Framework published in March 2012 (http://www.communities.gov.uk/publications/planningandbuilding/nppf).

The district wide level 1 SFRA for Aylesbury Vale was published in August 2012 and contains further detail on the requirements for sequential and exception testing. The Level 1 SFRA can be found at

http://www.aylesburyvaledc.gov.uk/local-development-plans/planning- policy/vale-of-aylesbury-plan-/strategic-flood-risk-assessment-level-1-aug-2012/

The Environment Agency has identified areas susceptible to surface water flooding both in the existing urban extent and on the periphery of the urban extent. The North periphery of Weedon is more susceptible to groundwater flooding. (See Figure D.72).

The SuDS potential map (Appendix E) identifies that the majority of the Weedon periphery is underlain by impermeable soils or strata and that any development will require land set aside for SuDS attenuation. Part of the town centre is underlain by permeable soil and is identified as being suitable for SuDS. However, the identification of this area as susceptible to groundwater flooding could mean that opportunities for infiltration SuDS are limited therefore any development within the Weedon periphery should allow enough land for attenuation storage.

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Water cycle Analysis Assessment element

Water quality Weedon is served by Aylesbury WwTW which is operated by Thames Water. The WwTW capacity environmental limits other settlements served by the Aylesbury WwTW include Aylesbury, Aston and wastewater Clinton, Buckland, Drayton Beauchamp, Halton, Hardwick, Hulcott, Weedon and treatment capacity Marsh Gibbon. Upper limit

Brook). The River Thame (Aylesbury to Scotgrove Brook) is not a designated Green Waterbody and the current overall status is Poor, with Phosphate status poor and Ammonia and Dissolved Oxygen status high.

The sewage flows from this development will be discharged at Aylesbury STW, which has capacity for an additional 9,000 properties or 22,000 domestic population equivalent without requiring upgrades.

The combined upper limit (12,300 properties) surpasses the capacity of Aylesbury STW requiring upgrades to be undertaken. These upgrades can only be undertaken in 2020-2025 or 2025-2030 (AMP7 or 8).

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Water cycle Analysis Assessment element

Wastewater network Thames Water Services have undertaken a Red Amber Green Assessment for this Upper limit infrastructure capacity settlement, and have identified that network capacity in this settlement is Amber for the upper limit and green for the lower limit. Amber

It is possible that the local network could accommodate 100 properties; however

there would need to be a study done to confirm this. Any development at this location would need to be considered with the Weedon Hill development as they merge into one sewer ultimately. Thames Water's preferred location of development would either be the NE or SE of the town. Lower limit

Amber. Infrastructure Development of the order of magnitude proposed (both the upper and lower limit) feasibility will require the construction of a major transfer main. This is currently within plans for AMP6 to be funded through the business planning process and supported by Major transfer customer bills. This requires regulator approval in 2014 before it can be confirmed, main and regulator approval will be contingent on confirmed proposals for future

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Water cycle evidence for the Vale of Aylesbury Plan Conclusions and recommendations

9 Conclusions and recommendations

This assessment comprises an evidence base that meets the requirements for a water cycle scoping study, and partially meet the requirements for an outline water cycle study guidance as described by the Water Cycle Studies Guidance (Environment Agency 2008).

A more detailed assessment of both environmental and infrastructure capacity will be required when further detail and confidence about the final potential location of development is available. In particular, two assessments that have been not been carried out as part of this evidence base will be required before allocations should be made:

1. A Water Framework Directive assessment of the impact of development on WFD compliance

2. An assessment of the impact of additional treated wastewater effluent on downstream river flood risk.

The following table summarises the overall assessment for each of the settlements assessed through this study, subdivided by market sub area.

The overall assessment is not a simple one-out-all-out, as it was considered this would present too pessimistic a view about future deliverability of housing. The notes and recommendations column for each settlement explain why the overall assessment may be less pessimistic than the assessment for each water cycle element.

It is unavoidable that with so little information regarding the allocation of the properties that the report focuses on constraints to development. It must be recognised that after a more defined site allocation reivew that the assessment could change. As well as a more cautious response becoming more supportive to development, it can be expected that there in some areas there may be a change in response from the more supportive to the less supportive.

Development management policies being implemented through the Vale of Aylesbury Plan must ensure that the additional investigations recommended above, and in the site specific recommendations table below, are delivered prior to any site specific allocations being made. Also, sufficient flexibility must be allowed within the Vale of Aylesbury Plan to allow for phased delivery of sites where detailed investigation has shown that a site is not deliverable within the original estimate.

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