Newport City Council
Newport Local Flood Risk Management Flood Risk Management Plan
Issue | 14 December 2015
This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party.
Job number 244494-00
4 Pierhead Street Capital Waterside Cardiff CF10 4QP United Kingdom www.arup.com
Document Verification
Job title Newport Local Flood Risk Management Job number 244494-00 Document title Flood Risk Management Plan File reference 4-50 Document ref Revision Date Filename Newport FRMP Draft Report.docx Draft 1 17 Jul Description First draft, circulated for comment. 2015
Prepared by Checked by Approved by Name Jenna Beckett Robin Campbell David Hetherington
Signature
Draft 2 9 Oct Filename Newport FRMP Draft Report.docx 2015 Description Updated Section 7 onwards, and additional information provided by Newport City Council for Sections 1 – 6, draft circulated for comment. Prepared by Checked by Approved by Name Rosemary Cripps Robin Campbell Catherine Wenger
Signature
Draft 3 9 Oct Filename Newport FRMP Draft Report Draft 3.docx 2015 Description Updated to reflect Newport City Council’s and Dŵr Cymru Welsh Water’s comments.
Prepared by Checked by Approved by Name Rosemary Cripps Robin Campbell Catherine Wenger
Signature
Issue 14 Dec Filename Newport FRMP Draft Report_Issue for Consultation.docx 2015 Description Issue for stakeholder consultation
Prepared by Checked by Approved by Name Rosemary Cripps Robin Campbell Catherine Wenger
Signature
Issue Document Verification with Document
| Issue | 14 December 2015 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Contents
Page
List of Acronyms 5
Synopsis 6
1 Introduction 7
2 Purpose of Flood Risk Management Plans in managing flood risk 8 2.1 What is a Flood Risk Management Plan? 8 2.2 What is included in this Plan? 8 2.3 Legislative Context 10
3 Study area 14 3.1 Administrative area 14 3.2 Local flood risk in Newport 21 3.3 Approach to high-level costing of measures 25
4 How Newport City Council currently manages flood risk 26 4.2 How Newport City Council prioritises their work 29 4.3 Who Newport City Council works with to manage flood risk 30 4.4 How this FRMP has been coordinated 31 4.5 Measures already underway to manage flood risk 32
5 Coordination with the Severn River Basin Management Plans 34
6 Newport Flood Risk Management Plan objectives 38
7 How Newport City Council will manage flood risk at a local level 40 7.1 Overview of local flood risk 40 7.2 Common local flood risk management measures 51 7.3 Allt-Yr-Yn Ward 56 7.4 Alway Ward 61 7.5 Beechwood Ward 66 7.6 Bettws Ward 71 7.7 Caerleon Ward 76 7.8 Gaer Ward 81 7.9 Graig Ward 86 7.10 Langstone Ward 91 7.11 Liswerry Ward 97 7.12 Llanwern Ward 102 7.13 Malpas Ward 107
| Issue | 14 December 2015 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.14 Marshfield Ward 112 7.15 Pillgwenlly Ward 117 7.16 Ringland Ward 121 7.17 Rogerstone Ward 126 7.18 Shaftesbury Ward 131 7.19 St Julians Ward 137 7.20 Stow Hill Ward 142 7.21 Tredegar Park Ward 147 7.22 Victoria Ward 152
8 Implementation and Delivery 157 8.1 Summary of Measures 157 8.2 Implementation Programme 157 8.3 Measure justification 158 8.4 Funding for Local Flood Risk Management 158 8.5 Environmental Influences on Measures 161
9 Public Consultation 164 9.1 Consultation on the Draft Local Flood Risk Management Plan 164 9.2 Further Consultation 165
10 Monitoring and review 166
Tables
Table 1 – Summary of relevant plans and lead RMAs Table 2 – Definition of ‘non-residential’ and ‘essential service’ property type Table 2 - Total counts of features in NCC Table 3 - NCC Local Flood Risk Management Strategy Measures Table 4 - Table outlining the primary roles of RMAs operating within Newport. Table 5 – Definitions of measures, used for reporting within the Floods Directive. Table 6 – Mapping interdependencies between Management Plan measures. Table 7 - Objectives of the National FRM Strategy and the NCC LFRMS Table 8 – Top five ranked wards, by proportion of properties at predicted flood risk (depth>0.2m) Table 9 – Summary of the predicted risk from surface water to a range of receptors. Table 10 - Estimated residents in areas at risk of flooding depth >0.0m Table 11 - Residential Properties at risk of internal flooding depth >0.2m Table 12 – Total features at high risk of surface water flooding (greater than a 1 in 30 chance of flooding in any year)
| Issue | 14 December 2015 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 13 - Total features at medium risk of surface water flooding (between 1 in 30 and 1 in 100 chance of flooding in any year) Table 14 - Total features at low risk of surface water flooding (between 1 in 100 and 1 in 1000 chance of flooding in any year) Table 15 – Summary of Borough-wide Measures Table 16 – Recorded historic local flooding in Allt-yr-yn Table 17 – Flood risk map counts for Allt-yr-yn Table 18 – Local flood risk management measures for Allt-yr-yn Table 19 – Recorded historic local flooding in Alway Table 20 – Flood Risk Map counts for Alway Table 21 - Local Flood Risk Management measures for Alway Table 22 – Recorded historic local flood events in Beechwood Table 23 – Flood Risk Mapping counts for Beechwood Table 24 - Local Flood Risk Management measures for Beechwood Table 25 – Recorded historic flooding in Bettws Table 26 – Flood Risk Map counts for Bettws Table 27 – Local Flood Risk Management measures for Bettws. Table 28 – Recorded historic ordinary watercourse flooding in Caerleon Table 29 – Recorded historic surface water flooding in Caerleon Table 30 - Flood Risk Map counts for Caerleon Table 31 - Local Flood Risk Management measures for Caerleon Table 32 - Flood Risk Map counts for Gaer Table 33 – Local Flood Risk Management measures identified for Gaer Table 34 - Flood Risk Map counts for Graig Table 35 – Local flood risk management measures for Graig Table 36 – Flood Risk Map counts for Langstone. Table 37 – Local flood risk management measures for Langstone. Table 38 – Flood Risk Map counts for Liswerry Table 39 – Local Flood Risk Management measures for Liswerry Table 40 – Flood Risk Map counts for Llanwern Table 41 – Local Flood Risk Management measures for Llandwern Table 42 – Flood Risk Map counts for Malpas Table 43 – Local Flood Risk Management measures for Malpas Table 44 – Flood Risk Map counts for Marshfield. Table 45 – Local Flood Risk Management measures for Marshfield Table 46 – Flood Risk Map counts for Pillgwenlly Table 47 – Local Flood Risk Management measures for Pillgwenlly Table 48 – Flood Risk Map counts for Ringland Table 49 – Local Flood Risk Management measures for Ringland Table 50 – Flood Risk Map counts for Rogerstone Table 51 – Local Flood Risk Management measures for Rogerstone Table 52 – Flood Risk Map counts for Shaftesbury Table 53 – Local Flood Risk Management measures for Shaftesbury
| Issue | 14 December 2015 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 54 – Flood Risk Map counts for St Julians Table 55 – Local Flood Risk Management measures for St Julians Table 56 – Flood Risk Map counts for Stow Hill Table 57 – Local Flood Risk Management measures for Stow Hill Table 58 – Flood Risk Map counts for Tredegar Park Table 59 – Local Flood Risk Management measures for Tredegar Park Table 60 – Flood Risk Map counts for Victoria Table 61 – Local Flood Risk Management measures for Victoria Table 62 – Summary of local flood risk management proposed measures across NCC
Appendices
Appendix A Historic Local Flood Events
| Issue | 14 December 2015 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
List of Acronyms
CIL Community Infrastructure Levy DCWW Dŵr Cymru Welsh Water Defra Department for Environment, Food and Rural Affairs EC European Commission ERDF European Regional Development Fund EU European Union FCERM Flood and Coastal Erosion Risk Management FDGiA Flood Defence Grant in Aid FWMA Flood and Water Management Act 2010 FTE Full Time Equivalent GIS Geographical Information Systems HRA Habitat Regulations Assessment IDB Internal Drainage Board LFRMP Local Flood Risk Management Plan LFRMS Local Flood Risk Management Strategy LLFA Lead Local Flood Authority LRF Local Resilience Forum NCC Newport City Council NFM Natural Flood Management PFRA Preliminary Flood Risk Assessment RBMP River Basin Management Plan RMA Risk Management Authorities SEA Strategic Environmental Assessment SFCA Strategic Flood Consequences Assessment SMP Shoreline Management Plan TAN Technical Advice Note WCMC Wales Coastal Monitoring Centre WFD Water Framework Directive
| Issue | 14 December 2015 Page 5 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Synopsis
Newport City Council (NCC) is a designated Lead Local Flood Authority (LLFA) under the Flood and Water Management Act (FWMA) 2010. NCC has joined all the LLFAs across Wales in opting to prepare a Flood Risk Management Plan (FRMP) to ensure a consistent approach. Surface water flooding is not a significant flooding mechanism for many parts of Newport as fluvial and/or tidal flooding presents a more significant risk. However it presents a residual risk and, often exacerbated by blockages, localised surface water flooding in a few locations is relatively frequent. Notable historic surface water flooding includes the City Centre in 1997, Gaer Vale in 2000 and across the Borough in 2014. Surface water drainage issues can be exacerbated by high tides in the Severn and Usk Estuary causing river or drainage systems to back up and occasionally flood. This is a particular issue on the low-lying Caldicot and Wentlooge levels. The wards with the highest proportion of properties at predicted surface water flood risk are Alway, Allt-yr-Yn, Bettws, Graig and Ringland. The Plan gives an overview of the flood risk from local sources in the borough consisting of surface water, groundwater and ordinary watercourses. Flood risk arising from Main Rivers, sea and reservoirs in Newport, and ordinary watercourses in the Caldicot and Wentlooge Level drainage districts are the responsibility of Natural Resources Wales. This Plan describes detailed objectives and measures which will ensure local flood risk in the borough is reduced during the next 6 years, after which the Plan will be reviewed. Flood risk management activities in the Borough have primarily been historically funded through government grants. However moving forwards, a partnership approach will be required. Implementing the measures will depend on securing sufficient funding. Failure to receive additional funding could result in measures identified not being implemented in part or full, or delayed.
Ove Arup & Partners Limited (Arup) have been commissioned by NCC to support the preparation of this plan. Arup cannot accept liability for the accuracy or otherwise of information derived from secondary sources, however, endeavours have been made to verify the suitability and appropriateness of information obtained in this way. The report has been prepared to comply with the Welsh Local Government Association’s FRMP template.
| Issue | 14 December 2015 Page 6 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
1 Introduction
The Flood Risk Regulations 2009 placed a duty on Lead Local Flood Authorities (LLFAs) to produce a Flood Risk Management Plan (FRMP) for all Flood Risk Areas1. Whilst no Flood Risk Area was identified in the borough, Newport City Council (NCC) joins all LLFAs across Wales in opting to prepare a FRMP to ensure a consistent approach. This FRMP gives an overview of the flood risk in the borough. NCC’s high-level objective is to work to reduce flood risk where significant local flood risk has been identified. Detailed objectives and measures are described which will ensure flood risk in the borough is reduced during the next 6 years, after which this plan will be reviewed. NCC staff have drawn on their experience and knowledge in the production of this plan to ensure NCC will manage local flood risk in an efficient and cost effective way. This is the first cycle of the Flood Risk Regulations. Lessons will be learnt from the challenge of delivering flood risk management interventions acceptable within Newport’s communities whilst attracting appropriate funding from Welsh Government and other sources. The predominant flood risk throughout much of Newport is from the Rivers Usk and Ebbw, and tidal flooding from the Severn Estuary. Flood risk from surface water and ordinary watercourses is localised, exacerbated by blockages and/or high tides restricting drainage. This plan covers flooding from surface water, groundwater, ordinary watercourses and the interface with river flooding. Flood risk arising from Main Rivers, sea and reservoirs in Newport is the responsibility of Natural Resources Wales (NRW) and their proposals are contained within the Severn River Basin District FRMP. Ordinary watercourses in the Caldicot and Wentlooge Level drainage districts are the responsibility of NRW.
1 Map of agreed Flood Risk Areas in England and Wales. Available at: https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/307085/FRMPs_Fl ood_Risk_Areas.pdf. Accessed 17/08/15
| Issue | 14 December 2015 Page 7 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
2 Purpose of Flood Risk Management Plans in managing flood risk
2.1 What is a Flood Risk Management Plan? The natural hazard of flooding risks the safety and sustainability of communities. Some 1 in 5 of the population is estimated to be at risk of flooding across Wales2. Managing this risk through careful planning is important to minimise the risk to communities. Flood risk management planning allows Risk Management Authorities (RMAs) to develop a better understanding of risk from all sources of flooding and agree priorities to manage that risk. This FRMP sets out how NCC will over the next 6 years manage flooding from local sources so that the communities most at risk and the environment benefit the most. In doing so, this FRMP takes forward the objectives and actions set out in NCC’s Local Flood Risk Management Strategy3 (LFRMS). This FRMP also sets out to meet the relevant objectives in the Welsh Government’s National Flood and Coastal Erosion Risk Management Strategy4. This provides the national framework for flood and coastal erosion risk management in Wales through four overarching objectives: Reducing the consequences for individuals, communities, businesses and the environment from flooding and coastal erosion; Raising awareness of and engaging people in the response to flood and coastal erosion risk; Providing an effective and sustained response to flood and coastal erosion events; and Prioritising investment in the most at-risk communities.
2.2 What is included in this Plan? The information within this FRMP includes the components set out in the EU Flood Directive. Most information has been gathered and updated through this first cycle, drawn from the findings of NCC’s Preliminary Flood Risk Assessment (PFRA) and the measures NCC set out in their LFRMS. This FRMP sets out objectives for the management of flood risk from local sources within the borough. The objectives focus on reducing the adverse consequences of flooding for human health, the environment, cultural heritage and economic activity.
2 Summary national flood and coastal erosion risk management strategy: Wales. Available from: http://gov.wales/docs/desh/publications/120412nssummaryen.pdf Accessed on 02/09/15. 3 Newport City Council Local Flood Risk Management Strategy. Available at http://www.newport.gov.uk/documents/Policies/Newport-LFRMS-Report-Issue-Rev.pdf Accessed on: 17/08/15 4 National Strategy for Flood and Coastal Erosion Risk Management. Available at http://wales.gov.uk/topics/environmentcountryside/epq/flooding/nationalstrategy/strategy/?lang=e n Accessed on: 24/07/15
| Issue | 14 December 2015 Page 8 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
This report highlights the areas predicted to be at risk from surface water flooding, groundwater flooding and ordinary watercourses in the borough. This report sets out the measures NCC will take over the next 6 years to mitigate these risks through prevention, protection, preparedness, and recovery and review to make Newport’s communities more resilient. This includes non-structural measures to reduce the consequence of flooding, including raising awareness and understanding of local flooding issues.
2.2.1 Production of surface water flood hazard and flood risk maps In 2013 the Environment Agency, working with NRW and LLFAs, produced the updated Flood Map for Surface Water5. The updated Flood Map for Surface Water assesses flooding scenarios as a result of rainfall with the following chance of occurring in any given year: 1 in 30 (3%) 1 in 100 (1%) 1 in 1000 (0.1%) JBA Consultants were contracted to produce the maps on behalf of the EA, NRW and LLFAs. The results were based on the 1, 3 and 6 hour rainfall duration model results for each return period which have then been combined on a worst-case basis to form a ‘critical storm duration’ dataset. Shallow/lowest hazard flooding, flooded areas of less than 100m2 and dry areas surrounded by water less than 50m2 had been removed. The updated map provides the following data for each flooding scenario: Flood extent and depth Flood velocity (including flow direction at maximum velocity) Flood hazard (as a function of depth and velocity) Consistent with the Flood Risk Regulations, the flood risk classifications are: High risk – greater than a 1 in 30 chance of flooding in any year Medium risk – between 1 in 30 and 1 in 100 chance of flooding in any year Low risk – between 1 in 100 and 1 in 1000 chance of flooding in any year
2.2.2 Limitations with surface water flood hazard and flood risk maps The Environment Agency’s updated Flood Map for Surface Water represents an improvement on the previous surface water flood maps, however predictions remain general in nature and limitations with prediction are summarised below:
5 Flood maps for surface water. Available at: https://naturalresources.wales/our-evidence-and- reports/maps/flood-risk-map/?lang=en. Accessed 17/08/15.
| Issue | 14 December 2015 Page 9 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Due to the modelling techniques used, the mapping picks out depressions in the ground surface and simulates some flow along natural drainage channels, rivers, low areas in floodplains, and flow paths between buildings. Although the maps appear to show flooding from ordinary watercourses, they should not be taken as definitive mapping of flood risk from these as the conveyance effect of ordinary watercourses or drainage channels is not explicitly modelled. Also, structures (such as bridges, culverts and weirs) and flood risk management infrastructure (such as defences) are not represented6. The predictions should be viewed at a high level and are not suitable for assessment of the risk to individual properties. It should also be noted that the maps present the ‘current day’ scenario with no allowance made for the effects of climate change or urban creep.
2.3 Legislative Context
2.3.1 Flood Risk Regulations 2009 The purpose of the Flood Risk Regulations is to transpose the European Commission (EC) Floods Directive (2007/60/EC), on the assessment and management of local flood risk, into domestic law in England and Wales and to implement its provisions. The Regulations set out a six year cycle with timescales for reporting to the European Commission and the publication of 3 key outputs, Figure 1.
Figure 1: Flood Risk regulations (2009) timescale7 The Regulations require NRW to prepare Directive deliverables associated with flood risk arising from Main Rivers, the sea and reservoirs, and the LLFAs to do the same for flood risk associated with local sources such as surface water, groundwater and ordinary watercourses.
6 Flood maps for surface water: how they were produced. Available at: https://www.gov.uk/government/publications/flood-maps-for-surface-water-how-they-were- produced Accessed 17/08/15 7 Source: Welsh Local Government Association FRMP Template
| Issue | 14 December 2015 Page 10 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
2.3.2 Preliminary Flood Risk Assessment The PFRA compiled information on significant local flood risk from past and future floods, based on readily-available information. The scope of the PFRA was a high-level screening exercise. Flooding from surface runoff, ground water and ordinary watercourses, and any interaction these sources have with Main Rivers was considered in order to identify flood risk areas as set out under the European Flood Directives (Section 3.3). NCC’s PFRA did not identify any areas of significant flood risk that satisfied the significance criteria8 set by the Welsh Government. An Indicative Flood Risk Area in Rogerstone has been removed during the PFRA process as it was deemed as not having a significant present or future flood risk. This is a cross boundary flood risk area shared with the neighbouring LLFA of Caerphilly County Borough Council.
Newport’s PFRA is to be made available on NCC’s website.
2.3.3 Flood Risk Management Plans for Flood Risk Areas LLFAs have a duty to prepare FRMPs for Flood Risk Areas identified in PFRAs. NCC are currently in the first cycle of the Regulations and FRMPs represent the final output of this cycle and must be published by December 2015. Whilst no Flood Risk Area was identified in the borough, NCC joins all LLFAs across Wales in opting to prepare a FRMP to ensure a consistent approach.
2.3.4 Flood and Water Management Act The FWMA was introduced in April 2010 in England and Wales. It was intended to implement Sir Michael Pitt’s recommendations following the widespread flooding of 2007. The FWMA was also intended to clarify roles and responsibilities between RMAs. Under the FWMA, the Welsh Government produced a National Strategy for Flood and Coastal Erosion Risk Management9 in January 2013. LFRMS were created to define who the RMAs are, what their functions are, and what their responsibilities are. LFRMS underwent public consultation. LFRMS also must be consistent with the National Strategy for flood and Coastal Erosion Management. NCC produced a LFRMS in October 2014.
2.3.5 Water Framework Directive The Water Framework Directive came into force on 22 December 2000 and was introduced by the European Commission (EC). Under the directive, member states
8 Indicative Flood Risk Areas have been identified where more than 5,000 people are at risk of flooding 9 National Strategy for Flood and Coastal Erosion Risk Management in Wales. Available at: http://gov.wales/topics/environmentcountryside/epq/flooding/nationalstrategy/strategy/?lang=en. Accessed 11/08/15.
| Issue | 14 December 2015 Page 11 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
are required to improve the management of water bodies with the aim of achieving improved chemical and ecological status in inland and coastal waters by 2015. The requirements of this directive are implemented in the UK via the Water Environment Regulations 2003. In addition to improving water quality, the regulation also promotes sustainable use of water as a natural resource, and encourages relevant authorities to conserve habitats and species that are dependant directly on water. The ecological and chemical status are assessed according to the following criteria: Biological quality (fish, benthic invertebrates, aquatic flora); Hydromorphological quality such as river bank structure, river continuity or substrate of the river bed; Physical-chemical quality (temperature, oxygenation and nutrient conditions); Chemical quality that refers to environmental quality standards for river basin specific pollutants. To meet the requirements of the Directive, NRW have produced a management plan for each of the three River Basin Districts in Wales. The River Basin Management Plan for the Severn River Basin District is applicable to the administrative boundary of NCC. This management plan outlines the measures that NRW are likely to implement to meet the requirements of the Directive. Specific measures, particularly structural measures, associated with managing local flood risk and coastal erosion will have to comply with the requirements of the Directive. As part of the on-going liaison between NCC and Natural Resources Wales, once specific measures are designed, these will be communicated to NRW for advice. In this way, NCC will consider how the strategy could assist, and benefit from, the delivery of the Water Framework Directive targets of achieving ‘good’ status for each waterbody in terms of quantity and ecological quality.
| Issue | 14 December 2015 Page 12 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
2.3.6 Summary of relevant plans and lead Risk Management Authorities Table 1 – Summary of relevant plans and lead RMAs
Plan or Strategy Purpose or scope Drivers Lead RMA National Strategy Sets out policies on flood and Statutory Welsh for Flood and coastal erosion risk requirement under Government Coastal Erosion management in Wales the FWMA. Risk Management FRMP Builds on the PFRA to set out Statutory LLFA (local flood how flooding from rivers and requirement and risk) and NRW the sea (NRW / EA) or surface timescales under (rivers and the sea) water, ground water and the Flood Risk (or EA in ordinary watercourses (LLFA) Regulations England) will be managed over a 6-year cycle. LFRMS Sets out objectives and high- Statutory LLFA level measures for the requirement under management of surface water, the FWMA. groundwater and ordinary watercourse flood risk. CFMP Sets out preferred flood risk Voluntary NRW (or EA in management policies for river England) flooding. RBMP Sets out a framework to Statutory NRW (or EA in delivery of WFD objectives. requirement under England) the WFD.
| Issue | 14 December 2015 Page 13 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
3 Study area
3.1 Administrative area NCC is a Unitary Authority located in South East Wales and covers an area of approximately 218km2. It is bordered by four other LLFAs (Figure 2); Monmouthshire County Council, Torfaen County Borough Council, Caerphilly County Borough Council and Cardiff City Council. The study area is within the Severn River Basin District and is served by Dŵr Cymru Welsh Water (DCWW) and NRW. NRW took over the duties of the Caldicot and Wentlooge Level Internal Drainage Board in April 2015. NCC has 20 wards with a total population of 146,600 (2013 census), some 4.8% of the total population of Wales. The number of residential properties within Newport is 63,400.
Figure 2: NCC administrative area and surrounding LLFA areas10
10 Source: URS Newport City Council – Preliminary Flood Risk Assessment: Preliminary Assessment Report (2011).
| Issue | 14 December 2015 Page 14 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 15 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
3.1.1 List of features used in counts to assess flood risk Guidance on FRMP preparation is available from the Environment Agency11, NRW and Welsh Local Government Association. This includes details of the features to be considered when evaluating flood risk from surface water and ordinary watercourses. The features have been divided into three categories; Risk to People, Risk to Economic Activity, and Risk to Natural and Historic Environment. Table 3 lists all features and the total counts for each ward within Newport. Counts of features at predicted flood risk were carried out in accordance with The updated Flood Map for Surface Water (uFMfSW) Property Points dataset (Environment Agency, 2014). The following datasets were used to generate the counts: National Receptors Dataset (2012) - contains data on listed buildings, scheduled ancient monuments, registered parks and gardens, environmental permitting sites, trunk or primary roads, railways, SSSI’s. uMfSSF Property Point Dataset - contains residential and non-residential property point data within an area. In addition to the standard OS address layer property data, the dataset provides details of the percentage of a perimeter that is wetted in a 1 in 30, 1 in 100, and 1 in 1000 rainfall event at 6 different depths: 0mm, 150mm, 200mm, 300mm, 600mm and 900mm. A multiplier of 2.32 people per property has been used to estimate the number of residents at risk. Each ward’s population has been also included in the report for comparison, sourced from the Office for National Statistics (ONS) 2012 Mid- Year Population Estimate. Doorway and access threshold levels are an important factor in determining the susceptibility of properties to flooding. In the absence of survey data, a typical value of 200mm is often assumed. The report therefore considers residential properties at risk of internal surface water flooding when flood waters are predicted to exceed a depth of 0.2m. It should be noted that feature counts are cumulative i.e. the total number of features at medium risk include the total number of features at high risk. ‘Non-residential property’ and ‘essential services’ are defined in the table below on the basis of Ordinance Survey property class.
11 Flood risk management plans (FRMPs): how to prepare them. Available at: https://www.gov.uk/guidance/flood-risk-management-plans-frmps-how-to-prepare-them Accessed 20/07/15
| Issue | 14 December 2015 Page 16 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 2 – Definition of ‘non-residential’ and ‘essential service’ property type
Non-Res Ser. Non-Res Ser. Airfield Electricity Generating Almshouse Employment Agency Ambulance Station Engineering Works Arena Equestrian Training Art Centre Estate Agency Art Gallery Factory Bakery Farming Bank Filling Station Bar Financial & Prof. Services Betting Office Fire Station Boat House Fitness Club Bowling Football Brewery Forge British Legion Club Garage Builders Garden Centre Builders Merchant Gas Production & Distribution Building Society Gas Regulating Bus Depot Gas Storage Bus Station General Commercial Café Golf Camping Government Office Car Dealer Graving Dock Car Hire Guest House Car Wash Hairdresser Caravanning Hall Cash And Carry Health Centre Cathedral Health Club Cattery High School Cemetery Higher Education Central Gov. Office Hire Shop Chapel HM Prison Chemical Works Hopper Chemist Horticultural Nursery Children’s Nursery Hospice Church Hospital Clinic Hostel Club Hotel Club House Industry & Business Services Community Centre Infant School Community Hall Inn Cooling Insurance Broker Crematorium Iron Works Cricket Job Centre Crown Court Joinery Dairy Junior School Day Care Kennels Dental Surgery Kingdom Hall Department Store Launderette Depot Laundry Distribution Leisure Centre Dog Pound Library Dry Cleaners Local Government Office Dry Dock Mill Education Mosque
| Issue | 14 December 2015 Page 17 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Non-Res Ser. Non-Res Ser. Museum Smithy Nightclub Snooker Nursery Social Club Nursing Home Social Services Office Sorting Office Parish Hall Sports Place Of Worship Sports Pavilion Police Services Sports Viewing Police Station Stables Post Office Steel Works Postal Distribution Storage Pre School Sunday School Education Presbytery Supermarket Primary School Surgery Printing Works Take Away Probation Centre Tank Public Convenience Taxi Business Public House Telecommunications Public Recycling Television Studio Pump House Tennis Pumping Territorial Army Putting Testing Quay Theatre Railway Station Timber Storage Recording Studio Tourist Information Recreation Ground Tower Recycling Trade Distribution Repair Centre Training Research Travel Agency Rest Home Tyre Depot Restaurant University Retail Park Vehicle Driver Training Retail Warehouse Vehicle Testing Road Haulier Ventilating Rugby Football Veterinary Surgery Sailing Vicarage Sandwich Bar Water Distribution School Water Filtration Secondary School Water Regulating Service Station Water Settling Shelter Water Treatment Ship Freight Welfare Services Shopping Wholesale Market Works
| Issue | 14 December 2015 Page 18 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 3 - Total counts of features in NCC
Yn
-
yr
-
rk
Allt Alway Beechwood Bettws Caerleon Gaer Graig Langstone Liswerry Llanwern Malpas Marshfield Pillgwenlly Ringland Rogerstone Shaftesbury St. Julians Stow Hill Tredegar Pa Victoria People and Property Residential Properties (n) 3,907 3,337 3,401 3,359 3,555 3,959 2,485 1,759 5,099 1,254 3,422 2,555 3,148 3,809 4,339 2,461 3,790 2,412 1,934 3,138 Essential Services (n) 66 22 27 31 67 36 25 59 168 149 27 69 108 29 50 28 29 99 12 40 Economic Activity Non-Residential Properties (n) 136 69 60 30 154 50 33 50 385 47 29 119 423 24 76 129 177 503 9 193 Primary/Trunk Roads (km) 48.5 27.2 28.1 28.3 69.3 37.5 54.3 114.5 80.8 75.4 31.5 128.2 47.4 38.9 61.5 29.7 31.7 29.9 21.5 18.6 Main Line Railways (km) 0.00 0.37 0.00 0.00 3.70 3.47 6.81 0.00 7.10 5.66 0.00 5.95 5.43 0.00 3.59 0.01 2.70 3.39 1.21 1.05 Agricultural Land - Grades 1, 2 & 3 (ha) 383 177 150 513 1394 281 1434 3035 1514 3988 206 3538 548 243 865 163 195 131 180 94 Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 0.00 0.00 2.45 0.00 62.94 0.00 0.00 15.44 128.29 37.30 3.41 117.64 72.87 0.00 0.00 10.67 28.77 7.09 0.00 9.33 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 34.95 37.30 0.00 117.63 0.25 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 34.95 37.30 0.00 117.63 0.25 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (ha) 0.00 0.00 2.45 0.00 63.93 0.00 3.76 72.09 706.70 2541.10 3.41 1882.25 84.12 0.00 0.00 10.80 28.83 7.07 24.34 9.33 Sites of Interest for Nature Conservation (ha) 47.86 20.25 1.77 79.48 166.02 43.25 149.44 641.88 328.58 339.24 12.37 25.38 8.26 13.15 130.23 13.43 38.22 0.00 2.48 0.00 National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 23.98 220.04 221.27 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 19.98 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 8.04 3.36 0.00 37.14 47.99 0.00 212.00 502.93 0.00 94.46 3.22 7.13 0.00 10.49 136.23 3.60 0.00 0.00 0.00 0.00 Registered Parks and Gardens (ha) 23.70 0.00 11.96 0.00 0.00 72.39 7.93 3.52 0.00 89.12 0.07 50.03 0.00 0.00 0.00 7.43 0.00 9.86 0.01 0.00 Country Parks (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 34.04 0.00 0.00 0.00 0.00 0.00 0.00 0.90 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 70.68 9.50 2.32 17.49 0.00 8.80 0.00 2.70 0.00 0.00 3.79 0.00 0.00 0.10 0.00 0.00 Listed Buildings (n) 37 2 4 7 82 4 38 32 8 16 8 27 17 0 13 6 2 107 0 19 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 50.85 0.25 36.56 42.65 0.00 45.93 0.00 54.31 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 6.41 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 19 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
3.1.2 River catchments Surface water drains into the two Main River catchments, namely: The River Usk – at over 120km long, this river is one of the longest in Wales. It rises in the mountains of mid-Wales then flows south-east through Abergavenny and Usk to the village of Caerleon, down through the centre of Newport to the strong tidal waters of the Severn Estuary12. Its catchment predominantly drains land to the north of Newport, flowing past Caerleon and through the centre of Newport and into the Severn estuary at Uskmouth. The River Ebbw – this catchment drains land to the west of Newport and flows through the western extent of Newport, meeting the River Usk adjacent to the docklands13. NCC is bordered by the Severn Estuary to the south, which itself forms part of the Bristol Channel and is a tidally influenced system.
3.1.3 Internal Drainage Board The Caldicot and Wentlooge Levels also account for much of the land to the southeast and southwest of Newport either side of the River Usk estuary.
Figure 3 – Wentlooge (green) and Caldicot (blue) Level Drainage Districts
12 Newport City Council (November 2008) Draft River Usk Strategy. Available at: http://www.newport.gov.uk/stellent/groups/public/documents/plans_and_strategies/cont322714.pd f Accessed on: 12/08/15 13 Newport City Council (June 2013) Newport Local Development Plan 2011-2026: Development and Flood Risk Background Paper. Available at: http://www.newport.gov.uk/stellent/groups/public/documents/plans_and_strategies/cont712253.pd f Accessed on: 12/08/15
| Issue | 14 December 2015 Page 20 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Water levels in the low-lying drainage district are managed by an Internal Drainage Board (IDB). They are the land drainage authority within their districts, responsible for ordinary watercourses and functions include supervising land drainage and flood defence works on ordinary watercourses. By doing this, they closely manage water levels, both in watercourses and groundwater, by improving and maintaining ordinary watercourses, drainage channels and pumping stations to reduce the risk of flooding. NRW took over the duties of the IDB in April 2015.
3.1.4 Artificial watercourses and waterbodies There is one known artificial watercourse within NCC, the Monmouthshire and Brecon Canal. The Council owns and maintains the two branches within the borough, covering approximately 7 miles in total. The Crumlin arm runs from the NCC boundary at Pontymason Lane through to High Cross and into the Malpas area where it meets the Brecon arm. The Brecon arm flows through Malpas to the city boundary with Torfaen. Lock regeneration works are ongoing, with NCC partnering with the Monmouthshire, Brecon & Abergavenny Canals Trust to promote sustainable regeneration of the canal from Five Locks, Pontnewydd to Newport and from Newport up to Cwmcarn. There are four significant artificial waterbodies (reservoirs) in the borough, in addition to DCWW treated water storage reservoirs. NCC is responsible for Gwastad Mawr Flood Storage Reservoir. DCWW is responsible for Pant-yl-oes Reservoir on the northwest border and Ynysyfro Reservoir near Rogerstone. The Leisure Trust are responsible for Tredegar Park Lake Reservoir.
3.2 Local flood risk in Newport Local flood risk is defined within the FWMA as being a flood risk from: Ordinary watercourses – all watercourses that are not designated Main River. Surface runoff – rainfall or other precipitation which is on the surface of the ground that has not entered a watercourse drainage system or public sewer. Groundwater – water that has percolated into the ground and may form underground ponds or streams, which may discharge above ground but lower down the catchment. The interface between Main Rivers and surface water flows. The predominant flood risks throughout Newport are from fluvial and tidal sources. Flooding from surface water, groundwater and ordinary watercourses is not considered significant. More detail is given in the following sub-sections.
3.2.1 Catchment characteristics The topography of Newport is generally low lying. Areas in the south and east of the study area (including the Caldicot and Wentlooge Levels) tend to be flat, along with areas along the banks of the River Usk (such as Caerleon). However, areas around Wentwood and Llanvaches have steeper slopes.
| Issue | 14 December 2015 Page 21 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The geology of Newport is relatively uniform with the bedrock of the area dominated by mudstone, siltstone and sandstones. This geology is permeable, meaning that water can permeate the surface and enter watercourses via underground (through flow), rather than overland methods. The soils in the north-west of Newport are typified by loamy, clayey soils with slightly impeded drainage. In the north-eastern extent of Newport, free draining, slightly acid loamy soils are found. Soils in the Caldicot and Wentlooge Levels and along the River Usk floodplain are typically loamy, clayey soils with naturally high groundwater, associated with alluvial deposits14.
3.2.2 Groundwater On a strategic scale in Newport, the PFRA concluded that groundwater is not considered to be a significant flood risk. The solid geology is blanketed by drift deposits across a significant proportion of the study area, primarily comprising alluvial and glacial deposits. Tidal flat despoits (a type of alluvium) are present across the southern parts of the study area and around the River Usk, and are typically underlain by fluvio-glacial l deposits. Glacial deposits dominate the north western parts of the study area, with areas of alluvium present associated with watercourses. Generally for the north east of the study area there are no superficial deposits indicated to be present, with only areas of alluvium present associated with the watercourses. The solid geology of the study area is relatively uniform. The Mercia Mudstone Group is present in across the southern parts of the study area, comprising red mudstone with bands of siltstones and sandstone. The St Maughnans Formation is present across the northern parts of the study area, comprising interbedded mudstone and sandstone. A small area of Blue Lias Limestone is also present in the east of the study area. Risk of groundwater flood associated with mining is low. Newport lies to the south of the South Wales Coalfields and is therefore not effected by historic coal mining. This has been confirmed by the Coal Authority online viewer15 which indicates there are no mine entries, coal outcrops or recorded shallow mine workings in the study area. The Review of Mining Instability in Great Britain16 indicates there are no records of metalliferous, rock, coal, iron, evaporites or chalk mining in the study area. Groundwater flooding as a result of the escape of water from mined voids is not anticipated in the study area Tidal flat deposits are present across the south of the study area which are relatively impermeable as they are cohesive in nature. The underlying fluvio-
14 Newport City Council (June 2013) Newport Local Development Plan 2011-2026: Development and Flood Risk Background Paper. Available at: http://www.newport.gov.uk/stellent/groups/public/documents/plans_and_strategies/cont712253.pd f Accessed on: 12/08/15 15 The Coal Authority, Online interactive map viewer, database updated 14th August 2014, accessed September 2015 http://mapapps2.bgs.ac.uk/coalauthority/home.html 16 Arup (1990) Review of Mining Instability in Great Britain for the Depart of the Environment, Wales Region, July.
| Issue | 14 December 2015 Page 22 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
glacial deposits are a more permeable granular material and are in hydraulic conductively with the tidal water level. As these tidal flat deposits confines the groundwater within the gravels, it is considered unlikely that water within the fluvio-glacial gravels will outcrop at the group surface in the south of NCC.
3.2.3 Surface water runoff Flooding from surface water runoff is usually caused by heavy rainfall either when a catchment is saturated after a period of persistent rainfall or impermeable after a prolonged dry period. Notable historic surface water flooding includes the City Centre in 1997, Gaer Vale in 2000 and across the Borough in 2014. Surface water flooding is often exacerbated by lack of cut-off ditches and drains, ditches being filled in or piped, or poor maintenance of ditches and watercourses by riparian owners. Damage to stream and other drains may also be caused by developers or livestock. Land management practices such as removal of top soil and removal of vegetation may also increase the surface runoff from the catchment. Runoff will be altered if an area is subject to a new development such as housing. Although the total runoff is likely to increase, planning policy requires controls to be imposed to restrict the maximum rate of runoff from these developments to typically a level no greater than greenfield runoff or existing discharge rates where appropriate.
3.2.4 Highway drainage Flooding from highway drainage usually occurs due to short, very high intensity storms. Flooding is often caused or exacerbated by highway gullies becoming blocked by debris. NCC manage this risk by maintaining gullies (Section 4.1.1) Pollution from highway drainage can arise from a variety of sources: these include accidents, general vehicle and road degradation, incomplete fuel combustion, small oil or fuel leaks and atmospheric deposition. Acute pollution occurs as a result of severe, usually transient, impact. A prolonged dry weather period enables a cumulative build-up of contamination on the carriageway. Intense rainfall following these conditions can lead to the highest concentrations of pollutants.
3.2.5 Ordinary watercourses At a community-scale, the area is drained through numerous ordinary watercourses. An ordinary watercourse is defined as a watercourse that does not form part of a Main River. This includes streams, drains, culverts, dikes, ditches and passages through which water flows. Known features are recorded by NCC and others are likely to be found as investigations continue. Flooding may be caused by inadequate maintenance, which is normally the responsibility of the riparian owners. Capacities of pipes are often significantly reduced by the build-up of silt and debris within the culverts. Flooding may also occur as a result of culvert failure. There are 345 culverts for which NCC are responsible for the maintenance of and a further 304 highway culverts. NCC
| Issue | 14 December 2015 Page 23 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
inspect culverts where there is evidence that capacity has been adversely affected (see Section 4.1.1). The surface water from the watercourses enters the drainage system through a large number of intakes, some with debris screen grids and some without. Flooding may occur when a culvert inlet or grid becomes blocked. NCC manage this risk by cleaning and maintaining inlets (see Section 4.1.1) There are approximately 87 debris gratings which NCC are responsible for. Ten inlets have been identified as critical due to the high risk of property or high speed road flooding should they become blocked: Ringland Circle, Ringland Forge Lane, Rogerstone Llanwern Village Gaer Pond Tredegar Reen, Duffryn St Cadocs Close, Caerleon Ogmore Crescent, Bettws A48 Langstone Nant Coch, Western Avenue A48 Penhow There are 18 storm water pumping stations maintained by NCC. Typically they are served by a dual pump arrangement providing some back-up. All are understood to be powered by mains electricity with no on-site back-up generation. Old Green South and Old Green North become tide-locked, restricting discharges. The following are considered high-risk and have telemetry installed: Malpas, M4 Roundabout Docks Way, Maesglas Old Green South Illegal connections to existing culverts and the culverting of watercourses without consent, also present a potential source of flooding and pollution. Where illegal works are identified, NCC can utilise its powers as LLFA to remedy the situation.
3.2.6 Sewer flood risk The sewer network in Newport mostly comprises combined sewers that take both foul sewage and surface water. Flows are usually controlled through combined sewer overflows (CSOs), which allow excess dilute flows to discharge into natural drainage channels to protect properties from sewer flooding but adversely affecting the quality of receiving watercourses. NRW is responsible for licencing and monitoring all CSOs. DCWW is the statutory water undertaker and is responsible for the public sewer systems within the Borough. DCWW maintains a register of historical property sewer flooding events which shows that there are localised sewer flooding issues within the borough. NCC operate and maintain 11 wastewater pumping stations which are to be transferred to DCWW ownership in 2016. Sewer flooding occurs when sewers are overwhelmed by heavy rainfall or when they become blocked. The chance of flooding depends on the capacity of the local sewerage system. Anonymised records of sewer flooding incidents from DCWW within Newport (dated 28th May 2015) indicate properties have flooded internally
| Issue | 14 December 2015 Page 24 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
and externally in the past due to hydraulic overload. Some external locations may be areas such as sections of highway, fields, car parks etc. In addition, data provided by the Integrated Surface Water Management Group indicates several small sewer flooding hotspots. However, the PFRA concluded flooding from sewers does not have significant consequences at a strategic scale.
3.2.7 Flood risk from Artificial Sources There are four significant artificial waterbodies (reservoirs) within their authority boundary, however, there are no records of flooding from these waterbodies. NCC own and maintain the two branches of the Monmouthshire and Brecon Canal. There are no records of flooding from the canal within the borough.
3.2.8 Interaction with Main Rivers and the Sea There are significant areas within Newport which are subject to river flooding. River flooding remains within the remit of NRW and is covered in the Severn River Basin Flood Risk Management Plan. Figures for river flooding have not been included in this report as it could result in double counting. The PFRA concluded that there was insufficient data available to draw definitive conclusions. Anecdotal evidence suggests that surface water flooding is exacerbated when high rainfall events occur during high tidal cycles as gravity drains and the outfalls are restricted by high tidal waters. Typically, these issues occur on and around the Caldicot Levels where the consequences are not deemed significant. Interactions with Main Rivers may also be identified within central Newport where surface water systems discharge into the River Usk in areas such as Crindau, the City Centre, Victoria and Reevesland. The formal and anecdotal data provided indicates that such interaction does not cause flooding with significant harmful consequences. In some locations drainage infrastructure, such as surface water pumping stations, mitigates this risk.
3.3 Approach to high-level costing of measures High-level costing of measures has been completed using the Environment Agency’s long term costing tool for flood and coastal risk management17 where sufficient information is available, or an indicative cost range has been estimated on the basis of similar types of schemes. No site walkovers, investigation or design has been completed as part of this desk-based study. Information including site-specific investigation, design and procurement-forms will be required to develop the costing of measures prior to business case justification and subsequent delivery.
17 Long term costing tool for flood and coastal risk management. Available at: https://www.gov.uk/government/publications/long-term-costing-tool-for-flood-and-coastal-risk- management Accessed on 26/8/15
| Issue | 14 December 2015 Page 25 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
4 How Newport City Council currently manages flood risk
NCC manage flood risk arising from surface water, groundwater and ordinary watercourses through: 1. Operational procedures, developed over years through good practice; 2. Measures included in the LFRMS; 3. Powers given to all LLFA through the FWMA 2010 and the Land Drainage Acts 1991 and 1994; 4. As NCC is also the Highways Authority for the area, powers under the Highway Act 1980. 5. As NCC is also the Local Planning Authority, powers under the Planning (Wales) Act 2015.
4.1.1 Operational procedures The main operational procedures used to manage flood risk in NCC are listed below: 1. Routine inspection and cleansing of highway drains (also called ‘surface water gullies’). All gullies are cleansed once a year on a routine programme. Any defects identified such as broken covers or stubborn blockages are identified and works orders raised to repair. 2. Reactive inspection and cleansing of blocked gullies which have been notified to NCC Highways by the public. If deemed necessary they are cleaned on a weekly reactive cleansing schedule. 3. Reactive inspection and repair of culverts. Given the level of resource to effectively inspect all culverts; inspections are restricted to systems where there is evidence that the capacity has been adversely affected. 4. Routine inspection, cleansing and maintenance of all intake grids to culverts on a continuous rota throughout the year. There is no telemetry on grids. 5. Reactive inspection and clearance of ‘critical’ grids preceding and following forecast heavy rainfall and/or a Flood Watch has been issued by NRW. 6. Emergency cleansing of blocked grids which have been notified to NCC Drainage by members of the public. 7. Reactive maintenance of NCC surface water outfalls. 8. Routine maintenance of NCC surface water pumping stations and on a reactive basis when a problem becomes apparent. 9. Liaison with the riparian owner to ensure they are fulfilling their responsibilities.
| Issue | 14 December 2015 Page 26 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
10. Supporting the LPA determination of applications for development to ensure that surface water run-off is to be controlled as near to the source as possible by the use of sustainable drainage systems18.
4.1.2 Measures contained within the Local Flood Risk Management Strategy Measures by NCC to manage and reduce flood risk contained within the LFRMS are summarised in Table 4.
18 Planning Policy Wales – Development Management and Flood Risk. Available at: http://gov.wales/docs/desh/publications/140731planning-policy-wales-edition-7-en.pdf Accessed 17/08/15.
| Issue | 14 December 2015 Page 27 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 4 - NCC Local Flood Risk Management Strategy Measures Short Term (0-20 years) and Short, medium and long term (0-100 years)
National Objectives NCC LFRMS’s Measures Reducing the consequences for individuals, communities, In partnership with other RMAs will lead the management of local flood risk and coastal erosion risk. businesses and the environment from flooding and coastal erosion Identify areas of significant local flood risk and prepare FRMP, using Flood Hazard maps and historical flood data. Identify areas at high risk of coastal erosion using Welsh Government maps, and prepare appropriate management plans. Ensure that the Local Development Plan adequately addresses flood and coastal erosion risks including climate change. Prepare the Strategic Flood Consequence Assessment to form part of LDP evidence base to help NCC make informed decisions so that, wherever possible, new development is directed away from areas at high risk of flooding, unless the Development Advice Maps are demonstrated to be incorrect and there are acceptable mitigation measures. Where required and funding is available, undertake catchment-based studies with a view to identifying flood risk and design new mitigation measures. Provide, whenever possible and in conjunction with the RMAs, advice to supportive landowners on sustainable land management. Establish, and regularly update, a register of all flood risk assets that are likely to significantly influence local flood risk and coastal erosion. Use forthcoming Welsh Government National Standards for Sustainable Drainage (SuDS) and accompanying guidance, when/if Schedule 3 of the FWMA places a duty on NCC to undertake the role of SuDS Approval Body (SAB). Annually monitor the strategy and review the strategy every 6 years. Raising awareness of and engaging people in the response to flood In conjunction with the RMAs: and coastal erosion risk Liaise with local communities and businesses to raise awareness on flood and coastal erosion risks. Raise awareness of property level protection19. Encourage participation from willing local communities and businesses in managing local flood risk. Make appropriate provisions to enable local communities and businesses to find information associated with flood and coastal erosion risks. This will include guidance on how to report a flood incident, important contact details and guidance on preparing flood plans. Form partnerships with relevant stakeholders to manage local flood risk. Providing an effective and sustained response to flood and coastal In conjunction with the Gwent Local Resilience Forum (LRF) and the RMAs as appropriate: erosion events Prepare emergency response plans to deal with flood risk arising from local sources. Assist local communities, businesses and individuals with the preparation of emergency plans. Continue to undertake exercises to test the implementation of their emergency plans, and their response and recovery mechanism to flooding incidents. Where necessary, endeavour to undertake investigations into flood incidents within four weeks. Prioritising investment in the most at risk communities Identify communities most risk of flooding from local sources or from coastal erosion, consider the cost and benefits to manage or reduce the risk, and prepare and implement prioritised projects. Annually review current maintenance regime and consider targeted maintenance changes to manage or reduce local flood and coastal erosion risk.
19 What is Property Level Protection? Available from http://www.nationalfloodforum.org.uk/what-is-plp/ Accessed 17/08/15.
| Issue | 14 December 2015 Page 28 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
4.1.3 Additional duties under the Flood and Water Management Act 2010 Under the FWMA, LLFAs such as NCC have been given additional duties which directly impact on flood risk management. These include: 1. A duty to investigate all flooding within its area, in so far as a LLFA consider it necessary or appropriate; 2. A duty to maintain an asset register of structures and features likely to affect flood risk; 3. A duty to contribute to sustainable developments; and 4. Consenting on Ordinary Watercourses (Section 29 of Schedule 2).
4.2 How Newport City Council prioritises their work The National Strategy sets a range of factors which should be considered in determining the type of risk management intervention, scale of investment and share met by Government. This largely considers the impact on receptors at-risk, influenced by the scale, duration, and onset of flooding: Risk to life; Longer term sustainability of the community, the approach taken and the wider environment; Economic impacts, costs and benefits; Impacts of flooding on the operational capacity of critical infrastructure; Social impacts, costs and benefits; Frequency of flooding; Environmental costs and benefits derived from the work; Availability of appropriate compensation sites where work impacts designated habitats; Impacts on wider cultural heritage; and Multiple benefits in relation to human health and wellbeing. Risk to life is regarded as the most significant factor in determining priority of investment. Welsh Government recently consulted on the way it allocates funding20. They intend to create a clear, objective way of directing funds to places at risk from all sources of flooding and coastal erosion. In order to satisfy the requirements of the National Flood and Coastal Erosion Risk Management Strategy, NCC’s FLRMS has thirteen detailed objectives implemented by twenty-one prioritised measures. Frequency of flooding is considered in terms of the annual probability of flooding. This is a measure of the chance of flooding over the course of any given year.
20 Flood and Coast Investment Programme (FaCIP) Consultation. Available at: http://gov.wales/consultations/environmentandcountryside/flood-and-coast-investment- programme-facip/?lang=en Accessed 11/08/15.
| Issue | 14 December 2015 Page 29 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
4.3 Who Newport City Council works with to manage flood risk
4.3.1 Risk management authorities NCC works closely with other RMAs to endeavour to bring to the community a joined-up approach to all sources of flooding, no matter which organisation has the legal duty. An example of such partnership working is the joint partnership between the then Environment Agency (now NRW) and NCC response to Malpas Brook flooding 130 properties and the Usk flooding an additional 9 properties in 2000, and the subsequent Goodrich Crescent scheme delivery. A list of the primary organisations NCC works with to manage flood risk is provided in Table 5. All these organisations will be consulted as part of preparation of this FRMP. The roles and responsibilities of RMAs are provided in detail by the Welsh Government’s National Strategy for Flood and Coastal Erosion Risk Management. Table 5 - Table outlining the primary roles of RMAs operating within Newport.
Organisation Area covered Summary of primary roles in respect of local sources of flood risk Primary Risk Management Authorities Natural Resources Wales Oversight responsibilities in relation to all flood Wales and coastal erosion risk management in Wales, Including the former: including flood risk arising from local sources. Environment NRW leads on the provision of technical advice and support to the other RMAs. They also lead on Agency national initiatives such as Flood Awareness Wales Forestry and is the single point of contact for enquiries and Commission information on flood risk. Wales In relation to responsibility for land drainage in the Countryside Gwent levels, an area of special drainage need: Council for A duty to comply with the National Strategy Wales and the relevant Local Strategy; Caldicot and Co-operation with other authorities, including Wentlooge sharing data; and Levels Internal A duty to contribute to sustainable Drainage Board development. Dŵr Cymru Welsh Supplies To act consistently with the National Strategy; Water drinking water To have regard to the content of the relevant and sewerage to Local Strategy; and most of Wales and parts of To co-operate with other RMAs including western England sharing data. Newport City Council Newport NCC has been established as a LLFA for its administrative area. NCC is also the highway authority for the area having responsibility for managing all adopted highways which are not included within the remit of SWTRA. NCC also is the local planning authority and the Civil Contingencies Unit.
| Issue | 14 December 2015 Page 30 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Other key partners include: Neighbouring LLFAs – Caerphilly County Borough, Cardiff City, Monmouthshire County and Torfaen County Borough Councils. The borough’s 12 community councils21 Flood Risk Management Wales Committee22 Emergency Services – South Wales Fire and Rescue, Welsh Ambulance Service, Aneurin Bevan University Health Board and Gwent Police National Flood Forum Network Rail Local Resilience Forum (LRF) South Wales Trunk Road Agency (SWTRA) Cadw
4.3.2 Riparian landowners Those who own land adjoining, above or with a watercourse running through it, are ‘riparian landowners’ and are key to efforts to manage flood risk from ordinary watercourses. NRW provide useful guidance on riparian landowner responsibilities23 which include: maintaining river beds and banks allowing the flow of water to pass without obstruction controlling invasive species such as Japanese knotweed Riparian landowner also have a responsibility to manage their own flood risk.
4.4 How this FRMP has been coordinated Co-ordination and development of this FRMP has been achieved through regular meetings of the various groups as listed below: 1. South and East Wales Flood Risk Management Group attended by all LLFA in South Wales, NRW, Welsh Local Government Association and DCWW; 2. FRMP Working Group attended by all LLFAs in South East Wales, Welsh Government, NRW and Welsh Local Government Association; 3. Internal collaboration has been achieved through regular meetings of the Flood Risk Management Team; and 4. Sharing of work programmes with NRW and DCWW.
21 Newport Community Councils. Available at: http://www.newport.gov.uk/_dc/index.cfm?fuseaction=political.communitycouncils. Accessed on 11/08/15. 22 Flood Risk Management Wales Committee. Available at: http://naturalresources.wales/about- us/our-chair-and-board/our-board-committees/flood-risk-management-wales-committee- frmw/?lang=en. Accessed 11/08/15. 23 A guide to your rights and responsibilities of riverside ownership in Wales. Available at: https://naturalresources.wales/flooding/managing-flood-risk/riverside-property-owners-know- your-rights-and-responsibilities/?lang=en Accessed on 05/10/15.
| Issue | 14 December 2015 Page 31 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
4.5 Measures already underway to manage flood risk Details of the measures and operational procedures already underway in Newport have been listed in Section 4.1.1. The Floods Directive places a requirement that the measures should address the four categories of Prevention, Protection, Preparedness, and Recovery and Review. Details for each category are below. A count of the number of measures within each category has been included by ward. Table 6 – Definitions of measures, used for reporting within the Floods Directive.
Reporting Prevention Code Type Measure Description M21 Avoidance Measure to prevent the location of new or additional receptors in flood prone areas, such as land use planning policies or regulation. M22 Removal or Measure to remove receptors from flood prone areas, or to Relocation relocate receptors to areas of lower risk. M23 Reduction Measures to adapt receptors to reduce the adverse consequences in the event of a flood action on buildings, public networks, etc. Other measures to enhance flood risk prevention (may include, M24 Other flood risk modelling and assessment, flood vulnerability Prevention assessment, maintenance programmes, or policies etc.) Issue Flood Defence Consents, comment on Flood Consequence Assessments, update and improve the accuracy of flood risk mapping, and understand the local flood risk better.
Reporting Protection Code Type Measure Description M31 Natural Flood Measures to reduce the flow into natural or artificial drainage Management/ systems, such as overland flow interceptors and or storage, Run Off and enhancement of infiltration etc. and including in-channel, Catchment floodplain works and the reforestation of banks, that restore Management natural systems to help slow flow and store water. M32 Water Flow Measures involving physical intervention to regulate flows, Regulations such as construction modification or removal of water retaining structures (e.g. dams or other on-line storage areas or development of existing flow regulation rules), and which have significant impact on the hydrological regime. M33 Channel, Measures involving physical interventions to freshwater Coastal and channels, mountain streams estuaries coastal waters and flood Floodplain prone areas of land, such as construction, modification or Works removal of structures or the alteration of channels, sediment dynamics management, dykes etc. M34 Surface Water Measures involving physical interventions to reduce surface Management water flooding, typically, but not exclusively, in an urban environment, such as enhancing artificial drainage capacity or through sustainable drainage systems (SuDS). Other measures to enhance protection against flooding, M35 Other including flood asset maintenance programmes, or policies. Protection On-going maintenance programme.
| Issue | 14 December 2015 Page 32 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Reporting Preparedness Code Type Measure Description M41 Flood Measures to establish or enhance a flood forecasting or warning Forecasting system. and Warning M42 Emergency Measures to establish or enhance flood event institutional Event emergency response planning. M43 Public Measures to establish the public awareness or preparedness for Awareness flood events. and Flood awareness programme. Preparedness M44 Other Other measures to establish or enhance preparedness for flood Preparedness events to reduce adverse consequences.
Report Recovery and Review Code Type Measure Description M51 Individual and Clean up and restoration activities (buildings, infrastructure, etc.). Societal Health and mental health supporting actions, including managing Recovery stress. Disaster financial assistance (grants, tax) including disaster unemployment assistance, temporary or permanent relocation or other. M52 Environmental Clean up and restoration activities (with several sub topics as Recovery mould protection, well-water safety and securing hazardous material containers). M53 Other Recovery Lessons learnt from flood events, insurance policies. and Review
Each measure listed in the Flood Risk Management Strategy and used in this report has been placed into one of these categories as noted within each measure.
| Issue | 14 December 2015 Page 33 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
5 Coordination with the Severn River Basin Management Plans
NCC lies within the catchment for the River Severn RBMP. The updated draft Severn RBMP was published24 by the Environment Agency and NRW. NCC reviewed the consultation draft and no matters were raised in response. Flood risk management is one of many reasons why waterbodies fail to meet the WFD objectives. Where action is needed to manage the risk of flooding, it should not lead to further deterioration of the water environment but instead seeks opportunities for improvement and delivers joint benefits. The draft Severn River Basin Flood Risk Management Plan (RBFRMP) was published25 by the Environment Agency and NRW.
Figure 4 - 2009 River Basin Management Plan ecological river waterbody quality status26 - note estuarine River Usk is moderate.
24 River basin management plan for the Severn River basin district. Available at: https://consult.environment- agency.gov.uk/portal/ho/wfd/draft_plans/consult?pointId=s1405417965041#section- s1405417965041. Accessed 17/08/15 25 Draft Severn River Basin District Consultation on the draft Flood Risk Management Plan. Available at: http://naturalresources.wales/about-us/consultations/our-own-consultations- closed/consultation-on-draft-flood-risk-management-plans-for-wales/?lang=en. Accessed 17/08/15. 26 Available at: http://maps.environment- agency.gov.uk/wiyby/wiybyController?topic=wfd_rivers&layerGroups=default&lang=_e&ep=ma p&scale=6&x=331382&y=188071 Accessed 05/10/15.
| Issue | 14 December 2015 Page 34 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Figure 5 - 2009 River Basin Management Plan ecological river waterbody quality status27- note estuarine River Usk is good. In selecting the measures in the FRMP we have considered what is proposed in the other plans to ensure that all are complimentary. This is shown in Table 7. Where there is an obvious opportunity to deliver against the Water Framework Directive and the Flood Regulations, we have endeavoured to include it.
27 Available at: http://maps.environment- agency.gov.uk/wiyby/wiybyController?topic=wfd_rivers&layerGroups=default&lang=_e&ep=ma p&scale=6&x=331382&y=188071 Accessed 05/10/15.
| Issue | 14 December 2015 Page 35 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 7 – Mapping interdependencies between Management Plan measures.
Measure Category NCC LFRMS Measure Severn FRMP Measure Severn RBMP Measure Prevention NCC in partnership with other RMAs will lead the management of flood risk arising from local Working with others to avoid inappropriate development to the floodplain Table 9, Measure 2: Removal or modification of engineering sources, and coastal erosion risk within Newport Ensuring appropriate floodplain compensation to mitigate for development structure Supporting the implementation of sustainable urban drainage systems Table 9, Measure 3: Improvement to condition of channel/bed and/or banks/shoreline Advising how new development can be more resilient to flooding Table 9, Measure 5: Changes to operation and maintenance Ensuring a robust maintenance programme Table 9, Measure 6: Vegetation management Table 9, Measure 7: Dredging and silt management Table 12, Measure 3: Improvement to condition of channel/bed and/or banks/shoreline Prevention NCC will use EA flood hazard maps to identify areas of significant local flood risk, Undertaking mapping and modelling to ensure flood risk information remains up to Table 9, Measure 5: Changes to operation and maintenance supplemented with historical data. Flood Risk Management Strategy and plans will be date and fit for purpose prepared on this information. Prevention NCC will undertake catchment based studies with a view to identifying flood risk and design Identifying opportunities for floodplain restoration Table 9, Measure 2: Removal or modification of engineering new mitigation measures. Ensuring appropriate flood plain compensation to mitigate for development structure Table 9, Measure 5: Changes to operation and maintenance Protection NCC, with the RMAs, will provide advice to supportive landowners on sustainable land use Increasing awareness and encouraging landowners to fulfil their riparian landowner Table 9, Measure 6: Vegetation management management aiming at improving the risk of flooding. responsibilities Table 14, Measure 3: Sustainable woodland and forestry Encouraging best farming practices to reduce rapid surface water run-off and soil management erosion Preparedness NCC will establish, and regularly update, a register of all flood risk assets that are likely to Reviewing Asset System Management Plans Table 9, Measure 5: Changes to operation and maintenance influence local flood risk and coastal erosion. Delivering emergency works where needed for flood risk management assets. Protection NCC will adopt the Welsh Government guidance to implementing Sustainable Drainage Supporting the implementation of sustainable urban drainage systems Table 9, Measure 4: Improvement to condition of riparian Systems and to execute its role as a SuDS Approval Body, subject to the implementation of zone and/or wetland habitats this legislation. Table 9, Measure 6: Vegetation management Table 14, Measure 3: Sustainable woodland and forestry management Recovery and NCC will annually monitor the strategy and will review the strategy every 6 years. Improve and develop service based on lessons identified following flood events. Review Preparedness NCC, with the RMAs, will liaise with local communities and businesses to raise awareness on Working with others to avoid inappropriate development in the floodplain. flood and coastal erosion risks. Promoting flood resilience and flood proofing Providing advice and information to local communities to enable them to reduce the impact of flooding Preparedness NCC, with the RMAs, will raise awareness on the implementation of property level flood Advising how new development can be more resilient to flooding resilience measures. Providing advice and information to local communities to enable them to reduce the impact of flooding Preparedness NCC, with the RMAs, will make appropriate provisions to enable local communities and Providing advice and information to local communities to enable them to reduce the businesses to find information associated with flood and coastal erosion risks. This will include impact of flooding guidance on how to report a flood incident, contact details, and guidance on preparing flood Maintaining and improving the flood forecasting, flood warning and flood incident plans. management service Providing flood incident response service 24 hours a day Preparedness NCC, in conjunction with the Gwent LRF, is preparing emergency response plans to deal with Maintaining and improving the flood forecasting, flood warning and flood incident Table 9, Measure 10: First cycle investigations flood risk arising from local sources. management service Preparedness NCC, in conjunction with the LRF, and the RMAs, will assist local communities, businesses Maintaining and improving the flood forecasting, flood warning and flood incident Table 9, Measure 10: First cycle investigations and individuals with the preparation of emergency plans. management service
| Issue | 14 December 2015 Page 36 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Measure Category NCC LFRMS Measure Severn FRMP Measure Severn RBMP Measure Recovery and Where necessary, NCC will endeavour to undertake investigations into flood incidents within Ensuring a robust maintenance programme Table 9, Measure 10: First cycle investigations Review four weeks. Maintaining and improving the flood forecasting, flood warning and flood incident management service Providing flood incident response service 24 hours a day Improve and develop services based on lessons identified following flood events Protection NCC will identify communities that are most at risk of flooding from local sources or from Undertake initial assessment and feasibility work for reducing flood risk Table 9, Measure 10: First cycle investigations coastal erosion, consider the cost and benefits of identified schemes that manage or reduce the risk of flooding from these sources, and prepare and implement a prioritisation system specific projects. NCC will also prepare a business case for securing funding for these projects. Protection NCC will annually review their current maintenance regime and consider targeted maintenance Improve and develop services based on lessons identified following flood events Table 9, Measure 5: Changes to operation and maintenance changes to manage or reduce local flood and coastal erosion risk.
| Issue | 14 December 2015 Page 37 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
6 Newport Flood Risk Management Plan objectives
Welsh Government’s National Strategy for managing flooding and coastal erosion risk has set four overarching objectives: reducing the consequences for individuals, communities, businesses and the environment from flooding and coastal erosion; raising awareness of and engaging people in the response to flood and coastal erosion risk; providing an effective and sustained response to flood and coastal erosion events; and prioritising investment in the most at risk communities. Following the production of the National strategy NCC published its LFRMS that takes forward the national strategies objectives. The 4 overreaching objectives from the national plan take into account the social, economic and environmental risks associated with flooding. To be consistent with the Flood Risk Regulations requirements, NCC’s LFRMS objectives focus around the reduction of potential adverse consequences of flooding for human health, the environment, cultural heritage, economic activity and if considered appropriate on local community facilities. NCC set objectives for Newport’s LFRMS by translating the four overarching objectives of the National Strategy into objectives specific to Newport. These objectives are aimed at reducing the consequences of flood risk arising from local sources and coastal erosion risk, and address the short term (0-20 years), the medium term (20-50 years) and the long term (50-100 years) outcomes of the strategy. This ensures that the objectives are also consistent with the requirements of the Regulations. The objectives are summarised in the Table below.
| Issue | 14 December 2015 Page 38 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 8 - Objectives of the National FRM Strategy and the NCC LFRMS
Overarching objectives of the National Strategy Objectives of NCC’s LFRMS Social Economic Environmental Reducing the consequences for individuals, communities, Provide strategic leadership for assessment and management of flood risk arising businesses and the environment from flooding and coastal from local sources and coastal erosion erosion. Reduce number of people exposed to flooding Reduce risk to life (flooding of significant depth and velocity) Reduce the number of residential and commercial properties affected by the risk of flooding Reduce disruption to essential services and critical infrastructure Minimise damage to environmentally sensitive sites Develop effective land use and land management policies, and development management procedures Prepare an asset maintenance and management plan Raising awareness of and engaging people in the response Ensure that those living in areas susceptible to local flood and coastal erosion to flood and coastal erosion risk. risks are aware of it and understand what actions they can take to improve their protection Ensure that NCC works in partnership with all Management Authorities and works collaboratively with adjacent Authorities for successful implementation of the strategy Providing an effective and sustained response to flood and Prepare emergency response plans and test their implementation coastal erosion events. Respond to flood incidents and implement subsequent recovery measures in a timely manner Prioritising investment in the most at risk communities. Prepare a programme of investment for flood and coastal erosion risk management based on a cost benefit analysis for communities at risk
| Issue | 14 December 2015 Page 39 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7 How Newport City Council will manage flood risk at a local level
Local flood risk will be managed on a ward boundary scale. This provides a suitable level of granularity whilst directly linking into NCC governance structures. Measures have been identified and informed by: Records of known historic local flooding incidents (see Appendix 1) were provided by NCC on 31st July 2015, supplementing records in NCC’s PFRA. South Wales Fire and Rescue recorded attendance at incidents classed as ‘flooding’ between June 2009 and June 2015. Minor flooding and non-surface water flooding such as pipe bursts or sewer flooding was screened out where information was available. NCC asset informations supplemented by workshops held in September 2015 with NCC drainage engineering and operational staff to capture known operational, maintenance and safety issues. Flood risk analysis of surface water mapping.
7.1 Overview of local flood risk The following tables and plans provide an initial overview of surface water flood risk within the borough. Less densely populated wards have less property at risk but otherwise the predicted risk is relatively spread across the borough. The predominant flood risk throughout much of Newport is from the Rivers Usk and Ebbw, and tidal flooding from the Severn Estuary. Flood risk from surface water and ordinary watercourses is localised, exacerbated by blockages and/or high tides restricting drainage. The wards with the greatest proportion of residential properties at predicted risk of surface water flooding are ranked below. The wards with a greater proportion of properties at high predicted risk of surface water flooding include those with steeper topography or adjoining the levels. The densely populated flatter, tidal flood risk dominated wards have the greatest proportion of properties at low predicted risk of surface water flooding. Table 9 – Top five ranked wards, by proportion of properties at predicted flood risk (depth>0.2m)
High (>1 in 30 Medium (1 in 30 to 1 in 100 Low (1 in 100 to 1 in 1000 Rank chance in any year) chance in any year) chance in any year) 1 Bettws Alway Victoria 2 Alway Bettws Pillgwenlly 3 Ringland St. Julians St. Julians 4 Allt-yr-Yn Beechwood Bettws 5 Graig Ringland Alway
| Issue | 14 December 2015 Page 40 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 10 – Summary of the predicted risk from surface water to a range of receptors.
High Medium Low (>1 in 30 (1 in 30 to 1 in 100 (1 in 100 to 1 in
chance in any chance in any 1000 chance in any year) year) year)
Residents in areas at risk of flooding 734 2,251 15,288 (depth >0.0m)
Residential properties at risk of 186 552 4,002 internal flooding (depth >0.2m)
Essential Services (n) 7 10 52
Non-Residential Properties (n) 85 233 853
Primary/Trunk Roads (km) 37.7 88.8 267.3
Main Line Railways (km) 1.95 3.84 8.59
Agricultural Land - Grades 1, 2 and 77 143 504 3 (ha)
Special Areas of Conservation 0 0.05 0.35 (SAC) (ha)
Special Protection Areas (SPA) (ha) 0 0.03 0.19
Ramsar Sites (ha) 0 0.03 0.19
Sites of Special Scientific Interest 13.19 34.91 217.74 (SSSI) (ha)
Sites of Interest for Nature 45.35 70.32 129.41 Conservation (SINC)
National Nature Reserves (NNR) 0 0.01 3.3 (ha)
Local Nature Reserves (LNR) (ha) 0.44 0.56 0.87
Ancient Woodland (ha) 4.96 8.27 19.17
Registered Parks and Gardens (ha) 8.08 11.49 27.09
Country Parks (ha) 0.17 0.56 4.19
Scheduled Ancient Monuments 0.93 2.01 6.75 (SAM) (ha)
Listed Buildings (n) 12 18 36
Essential Settings of Regional 7.11 12.02 26.03 Planning Guidance (ha)
There are few instances of groundwater flooding in Newport.
| Issue | 14 December 2015 Page 41 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 11 - Estimated residents in areas at risk of flooding depth >0.0m
High Medium Low Ward (>1 in 30 (1 in 30 to 1 in 100 (1 in 100 to 1 in 1000 chance in any year) chance in any year) chance in any year) Allt-yr-Yn 51 144 473 Alway 107 304 909 Beechwood 32 186 724 Bettws 181 311 1148 Caerleon 19 84 654 Gaer 9 51 459 Graig 53 102 371 Langstone 23 58 258 Liswerry 0 14 833 Llanwern 7 30 211 Malpas 12 46 295 Marshfield 12 16 135 Pillgwenlly 9 114 1206 Ringland 70 202 872 Rogerstone 16 118 810 Shaftesbury 26 88 677 St. Julians 58 181 1179 Stow Hill 28 121 422 Tredegar Park 0 0 724 Victoria 21 81 2928
| Issue | 14 December 2015 Page 42 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 12 - Residential Properties at risk of internal flooding depth >0.2m
High Medium Low Ward (>1 in 30 (1 in 30 to 1 in 100 (1 in 100 to 1 in 1000 chance in any year) chance in any year) chance in any year) Allt-yr-Yn 19 0.5% 42 1.1% 100 2.6% Alway 33 1.0% 102 3.1% 268 8.0% Beechwood 4 0.1% 46 1.4% 205 6.0% Bettws 43 1.3% 77 2.3% 312 9.3% Caerleon 4 0.1% 11 0.3% 91 2.6% Gaer 0 0.0% 7 0.2% 98 2.5% Graig 12 0.5% 21 0.8% 66 2.7% Langstone 6 0.3% 9 0.5% 38 2.2% Liswerry 0 0.0% 0 0.0% 196 3.8% Llanwern 3 0.2% 8 0.6% 24 1.9% Malpas 3 0.1% 9 0.3% 44 1.3% Marshfield 4 0.2% 5 0.2% 32 1.3% Pillgwenlly 4 0.1% 20 0.6% 355 11.3% Ringland 20 0.5% 43 1.1% 182 4.8% Rogerstone 5 0.1% 18 0.4% 131 3.0% Shaftesbury 7 0.3% 22 0.9% 196 8.0% St. Julians 11 0.3% 62 1.6% 357 9.4% Stow Hill 6 0.2% 27 1.1% 84 3.5% Tredegar Park 0 0.0% 0 0.0% 148 7.7% Victoria 2 0.1% 23 0.7% 1075 34.3%
| Issue | 14 December 2015 Page 43 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 44 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 45 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 46 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 47 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 13 – Total features at high risk of surface water flooding (greater than a 1 in 30 chance of flooding in any year)
Yn
-
as
yr
-
Allt Alway Beechwood Bettws Caerleon Gaer Graig Langstone Liswerry Llanwern Malp Marshfield Pillgwenlly Ringland Rogerstone Shaftesbury St. Julians Stow Hill Tredegar Park Victoria Residential Properties (n) flooding depth >0.2m 19 33 4 43 4 0 12 6 0 3 3 4 4 20 5 7 11 6 0 2 Essential Services (n) 4 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 2 0 0 Non-Residential Properties (n) 9 0 1 0 1 1 2 5 5 3 1 4 2 0 5 2 0 40 1 3 Primary/Trunk Roads (km) 1.6 1.0 0.8 2.0 1.5 1.6 4.2 3.0 0.8 3.5 0.5 4.1 1.1 3.9 3.2 1.3 1.6 1.1 0.3 0.6 Main Line Railways (km) 0.00 0.00 0.00 0.00 0.14 0.03 0.81 0.00 0.03 0.02 0.00 0.00 0.16 0.00 0.23 0.00 0.01 0.50 0.00 0.02 Agricultural Land - Grades 1, 2 and 3 (ha) 0 0 0 4 2 0 18 10 0 5 0 26 0 1 11 0 0 0 0 0 Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.74 0.00 3.62 0.00 8.82 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 Sites of Interest for Nature Conservation (SINC) 1.43 0.12 0.00 13.53 6.22 3.15 5.85 1.51 0.00 2.12 0.68 0.24 0.02 1.06 8.03 0.27 0.03 0.00 1.09 0.00 National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.44 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 0.00 0.00 0.00 0.57 0.40 0.00 1.19 0.70 0.00 0.37 0.06 0.06 0.00 0.01 1.60 0.00 0.00 0.00 0.00 0.00 Registered Parks and Gardens (ha) 0.40 0.00 0.23 0.00 0.00 2.62 0.17 0.09 0.00 4.15 0.00 0.38 0.00 0.00 0.00 0.01 0.00 0.03 0.00 0.00 Country Parks (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.17 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 0.33 0.00 0.00 0.36 0.00 0.00 0.00 0.01 0.00 0.00 0.23 0.00 0.00 0.00 0.00 0.00 Listed Buildings (n) 2 0 0 1 0 0 5 0 0 0 0 2 0 0 0 1 0 1 0 0 Essential Settings of Regional Planning Guidance (ha) 0.00 0.00 0.00 0.00 0.72 0.00 0.39 2.22 0.00 3.71 0.00 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 48 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 14 - Total features at medium risk of surface water flooding (between 1 in 30 and 1 in 100 chance of flooding in any year)
Yn
-
yr
r
-
Allt Alway Beechwood Bettws Caerleon Gae Graig Langstone Liswerry Llanwern Malpas Marshfield Pillgwenlly Ringland Rogerstone Shaftesbury St. Julians Stow Hill Tredegar Park Victoria Residential Properties (n) flooding depth >0.2m 42 102 46 77 11 7 21 9 0 8 9 5 20 43 18 22 62 27 0 23 Essential Services (n) 4 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 4 0 0 Non-Residential Properties (n) 11 7 2 1 5 4 4 7 11 7 1 6 28 1 12 2 2 113 2 7 Primary/Trunk Roads (km) 3.9 3.3 2.3 3.9 3.9 4.2 7.9 5.8 3.9 5.3 1.6 8.4 4.2 7.6 7.7 3.5 4.2 2.8 1.4 3.0 Main Line Railways (km) 0.00 0.00 0.00 0.00 0.45 0.20 1.20 0.00 0.05 0.07 0.00 0.00 0.43 0.00 0.52 0.00 0.03 0.84 0.00 0.05 Agricultural Land - Grades 1, 2 and 3 (ha) 0 0 0 6 3 0 29 19 2 10 0 53 0 2 17 0 0 0 2 0 Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.01 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) (ha) 0.00 0.00 0.00 0.00 0.01 0.00 0.03 1.47 0.12 9.62 0.00 23.45 0.02 0.00 0.00 0.00 0.00 0.00 0.19 0.00 Sites of Interest for Nature Conservation (SINC) 1.98 0.61 0.01 23.69 8.26 3.88 7.76 3.23 0.16 3.29 1.22 0.47 0.29 2.23 11.37 0.40 0.14 0.00 1.33 0.00 National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.56 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 0.00 0.00 0.00 0.76 0.50 0.00 1.79 1.88 0.00 0.71 0.12 0.08 0.00 0.07 2.36 0.00 0.00 0.00 0.00 0.00 Registered Parks and Gardens (ha) 0.65 0.00 0.34 0.00 0.00 3.64 0.31 0.10 0.00 5.35 0.00 0.98 0.00 0.00 0.00 0.02 0.00 0.10 0.00 0.00 Country Parks (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.55 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 0.76 0.01 0.01 0.77 0.00 0.00 0.00 0.02 0.00 0.00 0.44 0.00 0.00 0.00 0.00 0.00 Listed Buildings (n) 5 0 0 1 0 0 5 0 0 0 0 2 0 0 1 1 0 3 0 0 Essential Settings of Regional Planning Guidance (ha) 0.00 0.00 0.00 0.00 1.46 0.00 1.00 3.92 0.00 5.37 0.00 0.27 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 49 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 15 - Total features at low risk of surface water flooding (between 1 in 100 and 1 in 1000 chance of flooding in any year)
Yn
-
yr
-
Allt Alway Beechwood Bettws Caerleon Gaer Graig Langstone Liswerry Llanwern Malpas Marshfield Pillgwenlly Ringland Rogerstone Shaftesbury St. Julians Stow Hill Tredegar Park Victoria Residential Properties (n) flooding depth >0.2m 100 268 205 312 91 98 66 38 196 24 44 32 355 182 131 196 357 84 148 1075 Essential Services (n) 6 0 1 3 1 4 1 2 4 2 1 0 5 1 2 3 2 10 0 4 Non-Residential Properties (n) 18 20 18 23 21 17 14 24 56 42 2 23 149 4 56 41 53 184 13 75 Primary/Trunk Roads (km) 12.9 10.9 8.6 9.6 12.0 12.3 17.1 15.8 22.1 12.7 5.6 24.8 16.1 17.2 20.7 10.1 10.2 8.5 9.0 11.1 Main Line Railways (km) 0.00 0.00 0.00 0.00 1.12 0.64 1.70 0.00 0.11 0.72 0.00 0.02 1.18 0.00 1.56 0.00 0.11 1.36 0.01 0.06 Agricultural Land - Grades 1, 2 and 3 (ha) 0 0 0 11 7 0 74 58 18 64 1 215 0 5 34 0 0 0 17 0 Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.02 0.00 0.06 0.00 0.00 0.07 0.02 0.00 0.00 0.17 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.17 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.17 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) (ha) 0.00 0.00 0.02 0.00 0.06 0.00 0.30 4.79 8.70 69.88 0.00 132.8 0.12 0.00 0.00 0.00 0.01 0.00 1.06 0.00 Sites of Interest for Nature Conservation (SINC) 2.98 2.00 0.05 41.38 17.79 5.08 11.98 7.88 4.98 9.32 1.93 1.39 0.39 2.88 15.84 0.63 1.31 0.00 1.60 0.00 National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.04 1.31 1.95 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.87 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 0.05 0.00 0.00 1.18 0.96 0.00 4.25 4.00 0.00 2.33 0.24 0.26 0.00 0.49 5.37 0.04 0.00 0.00 0.00 0.00 Registered Parks and Gardens (ha) 1.74 0.00 0.87 0.00 0.00 7.75 0.83 0.11 0.00 10.24 0.02 5.06 0.00 0.00 0.00 0.08 0.00 0.39 0.00 0.00 Country Parks (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.07 0.00 0.00 0.00 0.00 0.00 0.00 0.12 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 3.13 0.09 0.02 2.40 0.00 0.10 0.00 0.03 0.00 0.00 0.97 0.00 0.00 0.01 0.00 0.00 Listed Buildings (n) 6 0 0 2 1 0 6 1 0 0 0 5 0 0 3 2 0 10 0 0 Essential Settings of Regional Planning Guidance (ha) 0.00 0.00 0.00 0.00 5.24 0.00 2.95 7.93 0.00 9.06 0.00 0.85 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 50 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.2 Common local flood risk management measures The following measures have been identified common to all wards in the borough.
7.2.1 Maintain flood asset register NCC will continue to develop and regularly update, a register of all flood risk assets that are likely to influence local flood risk and coastal erosion. This register contains details of the condition and ownership of these structures and features and will be supplemented with an asset maintenance plan for assets owned by NCC.
7.2.2 Flood investigations NCC will investigate flooding, when it is considered necessary and appropriate, to establish the cause, inform the appropriate risk management authorities, and propose mitigation measures. This will include providing guidance on how to report a flood incident, contact details and signposting to NRW guidance on preparing flood plans.
7.2.3 Community flood awareness and resilience NCC, in conjunction with the RMAs, will liaise with local communities and businesses to raise awareness on flood risks. This will include encouraging participation from willing local communities and businesses in managing local flood risk. This will include signposting to available resources from NRW28.
7.2.4 Culvert inlet grid maintenance safety and operation review NCC manage the risk of culvert inlet grid blockage by cleaning and maintaining inlets (see Section 4.1.1). The grids also prevent unauthorised access. The risk posed by all grids will be reviewed, validating those grids currently considered ‘critical’. Grid risk will be prioritised based on likelihood and consequence of blockage. The requirements of the Health & Safety at Work Act 1974 places a duty of care on NCC to ensure as far as reasonably practical, the health, safety and welfare at work of all of their employees. A prioritised programme to review grids and identify works necessary to ensure all meet minimum standards of safety is planned. This will consider whether a grid has a safe access route and working area to clear the screen of debris, material management/storage arrangements, and whether the grid arrangement is appropriate to reduce the risk of blockage and unauthorised entry whilst minimising the likelihood of debris build-up. Work will be completed with reference to NRW guidance on Trash and Security Screens.
28 What to do before, during and after a flood. Available from: http://naturalresources.wales/flooding/what-to-do-before-during-and-after-a-flood/?lang=en Accessed on 2/10/15.
| Issue | 14 December 2015 Page 51 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Planned and reactive grid maintenance protocols will be reviewed on the basis of grid risk to optimise and prioritise resources. Grids with the highest risk will be reviewed as to whether simple remote telemetry to trigger clearance would be justified. Grids with the lowest risk may be considered for alternative maintenance approaches on a case by case basis.
7.2.5 Highway surface water gully maintenance NCC clean all road drains (also called surface water gullies) across the city at least once a year and reported blocked gullies, provided they can gain access (see Section 4.1.1). In some parts of the NCC, the likelihood of blockage is greater for example parked vehicles frequently obstructing maintenance access and/or deciduous trees. NCC will review its gully cleansing programme and consider opportunities to optimise the service based on consideration of the likelihood and impact of a blockage.
7.2.6 Surface water and land drainage disconnection from combined sewers Many parts of the borough are served by a single sewer pipe that has to cope with both storm and foul water, serving properties and generally highway gullies. During periods of heavy rainfall, more water gets into the network than it can cope with. This often causes controlled overflows into rivers and sometimes even sewer flooding. Direct land drainage may connect to the combined sewer network. The amount of wastewater requiring treatment and pumping is also increased, resulting in higher operational costs. DCWW have an active programme to reduce the surface water entering their sewers and where possible catch, redirect and slow down the speed at which surface water enters the sewer, using a range of techniques as part of the RainScape programme. Such techniques have multiple benefits and are often undertaken as part of public realm improvements. NCC will engage with DCWW’s RainScape programme. It is recommend that prioritised investigations identify historically captured streams and springs into the combined sewer network29.
7.2.7 Catchment restoration and natural flood management Natural flood management (NFM) is the alteration, restoration or use of landscape features to reduce flood risk30. Peak flow is reduced during intense storm events by working with natural processes to protect, restore and emulate the natural
29 See: Broadhead et al (2015) Finding lost streams and springs captured in combined sewers: a multiple lines of evidence approach. Available at: http://onlinelibrary.wiley.com/doi/10.1111/wej.12104/abstract 30 Parliamentary Offices of Science and Technology. (2011, December). Natural Flood Management.
| Issue | 14 December 2015 Page 52 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
function of catchments, rivers and flood plains. Such an approach provides biodiversity and water quality benefits, and is aligned with meeting WFD catchment restoration objectives and the Water Strategy for Wales. The Pitt Review31 identified three types of NFM measures: Water retention through management of infiltration, in particular by protecting or enhancing soil condition; Provision of catchment-wide flood water storage such as retention ponds, floodplain woodlands, or enhanced wetlands and washlands; Slowing the flow of water by improving the management of river and adjacent land, including the planting of cover crops and the restoration of smaller watercourses to a more natural alignment. Several wards in Newport have largely rural upland sub-catchments, downstream populated communities and culverted watercourses. Glastir Advance identifies part of the east of the borough with potential for management to reduce flood risk and protect water supplies. No locations within the borough were identified by this mapping as a priority for Water Quality interventions.
Figure 6 - Glastir Advanced Water Quantity Mapping32 showing in green where land management practices are considered likely to reduce flood risk and protect water supplies for over 60-70% of the catchment. Further prioritised investigation with NRW is proposed to prioritise further work, drawing on the available scoping information including and Forest Research33.
31 The Pitt Review: Lessons learnt from the 2007 Floods (Cabinet Office, 2008) 32 Glastir Advance Mapping. Available from: http://gov.wales/topics/environmentcountryside/farmingandcountryside/farming/schemes/glastir/gl astir-advanced/?lang=en Accessed 1/10/15. 33 In 2014, the Environment Agency commissioned Forest Research to identify opportunities for woodland creation to reduce diffuse pollution and flood risk across England and Wales. High-level opportunity maps at a (scale of 1 km2) identify parts of Newport as priority areas in catchments of river waterbodies at risk of failing good status due to diffuse pollutant loads (Nitrate, Phosphate, Sediment, Pesticides and Faecal Indicator Organisms); areas at risk from flooding from rivers and
| Issue | 14 December 2015 Page 53 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
NCC, in conjunction with the RMAs, will provide advice to supportive landowners on sustainable land use management aiming at improving the risk of flooding. Sustainable land management should consider aspects such as environmental enhancement, habitat restoration and habitat creation, all of which can play a role in alleviating flood risk.
surface water and priority areas where runoff from soils is rapid and finally include information on constraints to woodland planting. In these locations woodland planting could deliver positive outcomes for water quality and/or flood risk management. See: http://www.forestry.gov.uk/fr/infd- 97xgxx Accessed on 01/10/15.
| Issue | 14 December 2015 Page 54 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.2.8 Summary of Measures Table 16 – Summary of Borough-wide Measures
Location and Measure Timescale Indicative Cost Strategic Description Context 1 Borough-wide Develop and Short term N/A (Revenue) M35 publish flood (0-5years) asset register 2 Borough-wide Maintain flood Ongoing N/A (Revenue) M35 asset register 3 Borough-wide Review flood Ongoing N/A (Revenue) M53 events and lessons learnt 4 Borough-wide Flood reporting Short term N/A (Revenue) M53 guidance on (0-5years) NCC website 5 Borough-wide Community Ongoing N/A (Revenue) M53 flood awareness & website update 6 Various – 87 Visual inspection Ongoing 10 days FTE M35, culvert inlet and prioritisation M44 grids 7 Various – 10 Investigation of Short term £100k nominal estimate M35, critical and 5 inlet grids (0-5years) (Inspection £3k + Design M44 H&S failing £5k + contingency (30%) culvert inlet = £10k each) grids 8 Various – 10 Replace inlet Short term £190k nominal estimate M35, critical culvert grids and (0-5years) (Replacement screen £3k M44 inlet grids associated access + Access works £8k + works prelims/supervision (30%) + contingency (30%) = £19k each) 9 Various – Address H&S Short term £140k nominal estimate M35, Assumed 10 defects (0-5years) (Access works £8k + M44 H&S failing prelims/supervision culvert inlet (30%) + contingency grids (30%) = £14k each) 11 Road gullies Review prog. Ongoing 5days FTE M35 12 Borough-wide Engage with Ongoing N/A (Liaison with M34 DCWW works to DCWW) reduce surface water and land drainage entering the sewer network. 13 Borough-wide Prioritised high- Short term N/A (Revenue) M31 level (0- investigation into 20years) Catchment Restoration and NFM. Total (non-revenue) 15days FTE & £430k
Recovery and review Preventing 3 0 5 8 Preparing Protecting
| Issue | 14 December 2015 Page 55 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.3 Allt-Yr-Yn Ward
7.3.1 Overview Allt-Yr-Yn Ward is situated in the central part of NCC, to the west of central Newport. It has a population of 8,78234 and covers an area of 3.83km2, which is approximately 1.8% of the total area of Newport at 217km2 35. Allt-Yr-Yn slopes down gently north-west to east. The ward is heavily concentrated with residential properties, however to the north of the ward open green space dominates. On the west side of Allt-yr-Yn heights there is a Local Nature Reserve containing ancient woodland and meadows. There are no Main Rivers in this ward.
7.3.2 Ordinary watercourses and surface water flood risk The available data indicates limited flooding from ordinary watercourses which potentially affect a limited number of highways and properties across the urban area. Problems may also occur in more isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There are no reported instances of historical flooding from ordinary watercourses in this ward. Historic flood information details two instances of flooding due to surface water in Allt-Yr-Yn which are detailed in the table below. In general these reported flood incidents relate to surface water flooding where the drainage systems cannot cope with high intensity rainfall. The reported flood incidents may also relate to blocked gullies or drains. Table 17 – Recorded historic local flooding in Allt-yr-yn
Location of Historic Flooding Reason St Woolos Cemetery Storm Water system issue Llanthewy Rd j/w Bryngwyn Surface Water Flooding/culvert flooding Rd
The table below summarises the impacts of flooding in Allt-Yr-Yn based on the Surface Water Flood map. The surface water flood maps show flooding potentially affecting roads and properties which can be broadly clustered into three main areas, two in the vicinity of Fields Park road near the centre of the ward and one near Caerau Road in the east of the ward. The areas are affected are generally classified as low risk, however there are a number of isolated areas of high/medium risk. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages.
34 Office for National Statistics (ONS) 2012 Mid-Year Population Estimate 35 Allt-Yr-Yn Ward Profile (2014) Newport City Council
| Issue | 14 December 2015 Page 56 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 18 – Flood risk map counts for Allt-yr-yn
Risk Counts Medium Low Totals in High (1 in 30 to (1 in 100 to Defined (>1 in 30 Risk to People and Property 1 in 100 1 in 1000 Area chance in chance in chance in any year) any year) any year)
Estimated residents in areas at risk of flooding depth >0.0m 9064 51 144 473 People (multiplier 2.32, Newport average household size 2010)
Residential Properties at risk of internal flooding depth >0.2m 3907 19 42 100 Residential Properties Essential Services 66 4 4 6 Risk to Economic Activity
Non-Residential Properties in areas at risk of 136 9 11 18 flooding depth >0.2m
Primary/Trunk Roads (km) 48.5 1.6 3.9 12.9 Mail Line Railways (km) 0.00 0.00 0.00 0.00 Agricultural Land - Grades 1, 2 and 3 (ha) 383 0 0 0 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) (ha) 0.00 0.00 0.00 0.00 Sites of Interest for Nature Conservation 47.86 1.43 1.98 2.98 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 19.98 0.44 0.56 0.87 Ancient Woodland (ha) 8.04 0.00 0.00 0.05 Registered Parks and Gardens (ha) 23.70 0.40 0.65 1.74 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 Listed Buildings (n) 37 2 5 6 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha)
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 57 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 58 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.3.3 Groundwater There are no recorded groundwater flood incidents.
7.3.4 Sewer Flooding There are 31 reported instances of DG5 sewer flooding in this ward.
7.3.5 Measures to reduce local flood risk The main local flood risks are identified as follows: Sorrel Drive/Fields Park Road – A number of residential properties are predicted to be at risk in this location. Whilst there have been no historic surface water flooding incidents, some sewer flooding is recorded. There are two culverted ordinary watercourses. No grids are maintained by NCC. Further investigation is proposed as records are incomplete as to the inlet arrangement of the culvert. Monitoring is proposed. There may be opportunities linking to the adjacent Allt-yr-Yn SINC. St Woolos Cemetery – NCC have recently taken over maintenance of a culvert from ordinary watercourse serving the cemetery which drains through a filter bed. Historic ponding of surface water is recorded. Whilst maintenance has addressed some historic issues, the culvert remains partially blocked at the outlet following encroachment into the channel. Further investigation is proposed, which is likely to recommend a new culvert (50m) and outfall. Woodville Road / Risca Road / Western Avenue – A number of residential properties and services are predicted to be at medium risk in this location. There area is served by an adjacent culverted ordinary watercourse. No records of historic flooding are available. No grids are maintained by NCC in the upstream area however downstream there is the Nant Coch, Western Avenue culvert inlet grid which has been identified as ‘critical’ by NCC. Further investigation is proposed as records are incomplete as to the inlet arrangement including opportunities for ‘daylighting’ the culverted sections of the Nant Coch where adjacent open space allows in the Glasllwch playing fields and Coed-Melyn Park. Monitoring is proposed. Llanthewy Road/Caerau Road – A number of residential properties and services are predicted to be at high/medium risk in this location. The area is served by a combined sewer network with some sewer flooding recorded. Highway ponding had been experienced due to blocked gullies however NCC has installed additional gullies and regularly clear them of leaves and other debris. Continued enhanced highway maintenance is proposed in the short term, combined with monitoring.
| Issue | 14 December 2015 Page 59 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The following measures are identified to reduce flood risk. Table 19 – Local flood risk management measures for Allt-yr-yn
Location and Measure Timescale Indicative Cost Strategic Description Context A1 Sorrel Investigate inlet Short term 2days FTE M24 Drive/Fields (0-5 years) A2 Park Road Monitor Ongoing N/A (Revenue) M53, M44 A3 St Woolos Investigate. Short term £10-20k estimate M24 Cemetery (0-5 years)
A4 Replace culvert Short term Enabling costs M34 and outfall. (0-5 years) (20%) £20k. 80m culvert assumed 750mm dia estimated between £100k- £160k A5 Fields Park Investigate inlet Short term £10-30k estimate M24 Road/Risca and ‘daylighting’ (0-5 years) Road culverts. A6 Culvert Medium Nominal estimate M33 improvement term (5-10 £50k - £150k works years) A7 Monitor Ongoing N/A (Revenue) M53, M44 A8 Llanthewy Enhanced Ongoing N/A (Revenue) M35 Road/Caerau highway drainage Road maintenance. A9 Monitor. Ongoing N/A (Revenue) M53, M44
Total (non-revenue) 2days FTE & £170-360k
Recovery and review Preventing 3 3 3 3 Preparing Protecting
| Issue | 14 December 2015 Page 60 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.4 Alway Ward
7.4.1 Overview Alway Ward is situated in the central part of NCC, to the east of Central Newport. It has a population of approximately 8,37134 and an area of 1.76km2, which is approximately 0.8% of the total area of Newport36. The Ward gently slopes down towards the Great Western railway to the south and the M4 motorway to the north, and mainly consists of residential housing. There are three significant surface water flooding locations, showing a 30 year extent, within the ward boundary. There are no Main Rivers in this ward.
7.4.2 Ordinary watercourses and surface water flood risk Culverted ordinary watercourses drain much of the ward. Ponding is shown upstream of the inlet screen Aberthaw Road within the allotment gardens. The available data indicates pockets of flooding associated with ordinary watercourses which potentially affect a number of highways and properties in three main areas in the south and east of the ward. Problems may also occur in other areas, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. The surface water flood maps show flooding potentially affecting roads and properties which can be broadly clustered into three main areas, two in the south of the ward near Conway Road and near Liswerry Drive, and one in the east of the ward in the vicinity of Ringland Road. These three areas are adjacent to ordinary watercourses. The two areas in the south of the ward are classified as medium/high risk and the area to the east is generally classified as low risk. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. Historic flood information details one record of flooding due to surface water in Alway which is detailed in the table below. This reported flood incident relates to surface water flooding from a blocked trash screen; it is likely that other flooding in the area is caused when similar drainage systems cannot cope with high intensity rainfall. Flooding may also relate to blocked gullies or drains. Table 20 – Recorded historic local flooding in Alway
Location of Historic Flooding Reason Ringland Circle Surface water flooding caused by blocked inlet grid on a culverted ordinary watercourse. Affected approximately 28 residential properties.
36 Alway Ward Profile (2014) Newport City Council
| Issue | 14 December 2015 Page 61 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The table below summarises the impacts of flooding in Alway based on the Surface Water Flood map, shown below. Table 21 – Flood Risk Map counts for Alway
Risk Counts Medium Low Totals in High (1 in 30 to (1 in 100 to Defined (>1 in 30 Risk to People and Property 1 in 100 1 in 1000 Area chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 7742 107 304 909 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 3337 33 102 268 Residential Properties Essential Services 22 0 0 0 Risk to Economic Activity Non-Residential Properties in areas at risk of 69 0 7 20 flooding depth >0.2m Primary/Trunk Roads (km) 27.2 1.0 3.3 10.9 Mail Line Railways (km) 0.37 0.00 0.00 0.00 Agricultural Land - Grades 1, 2 and 3 (ha) 177 0 0 0 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 0.00 0.00 0.00 0.00 (ha) Sites of Interest for Nature Conservation 20.25 0.12 0.61 2.00 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 3.36 0.00 0.00 0.00 Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 Listed Buildings (n) 2 0 0 0 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha)
| Issue | 14 December 2015 Page 62 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 63 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.4.3 Groundwater There are no recorded groundwater flood incidents.
7.4.4 Sewer Flooding There are 4 reported instances of DG5 sewer flooding in this ward.
7.4.5 Measures to reduce local flood risk The main local flood risks are identified as follows: Ringland Circle/Stanford Road – A high number of residential properties are predicted to be at medium risk in this location. The historic surface water flooding incident is attributed to a culvert inlet grid blockage. The fire service records include the pumping out a sheltered housing unit. NCC have since installed grid overflows, the grids have been identified as ‘critical’ for clearance. Sewer flooding to a number of properties is recorded however the sewerage is recorded to be a separate foul and storm system. The culverted ordinary watercourse discharges downstream into a storage lagoon structure and further investigation into ownership responsibilities and water level management is planned (see Section 7.16.5, Ringland Ward). Monitoring and further investigation is proposed of the culvert capacity and inlet arrangement. Ringland Avenue/Dents Hill – A small number of residential properties are predicted at risk in this location. Lack of maintenance of the culverted watercourse has been highlighted to present a blockage risk. Liaison with riparian owners is planned. Liswerry Park Drive – Localised highway ponding occurs when highway gullies become blocked along the railway underpass. A number of residential properties are predicted at risk however no flooding is recorded in this location. The area would be prone to surface water ponding if a culvert adjacent and under the railway were to become blocked. Investigation into maintenance responsibilities and inlet arrangement is planned. Adjacent Lliswerry Playing Fields and Angling Ponds SINC may offer additional attenuation storage to hold back peak flows, should an intervention be justified. Somerton Road – A large number of residential properties are predicted at high risk however no recent incidents have been recorded. It is likely that the predictions are precautionary given that culverts run adjacent and under the railway. Attenuation storage to hold back peak upstream flows in Beechwood Park and the Aberthaw Road allotments should be considered. Investigation into the culvert capacity, inlet arrangement and maintenance responsibility is planned. There are anecdotal reports of historic surface water flooding during intense rainfall as drainage systems serving the area south of Chepstow Road became overwhelmed. Highway gullies drain into the combined sewer network.
| Issue | 14 December 2015 Page 64 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Gibbs Road – Highway ponding is predicted and there have been two incidents requiring fire service pumping. Further investigation of the highway drainage and adjacent culvert is proposed. The following measures are identified to reduce flood risk. Table 22 - Local Flood Risk Management measures for Alway
Location and Measure Timescale Indicative Strategic Description Cost Context B1 Ringland Investigate and establish Short term 3days FTE M43, Circle/Stanford local flood action group to (0-5) and £5k M44 Road monitor & assist with debris (public clearance. meeting) B2 Investigate culvert capacity Short term £5-10k M24, and identify hydraulic pinch- (0-5 years) M53 points. B3 Monitor Ongoing N/A M53, (Revenue) M44 B4 Ringland Liaison with riparian owners Short term 1day FTE M24, Av/Dents Hills regarding (0-5 years) M43 maintenance/operation responsibilities. B5 Monitor Ongoing N/A M53, (Revenue) M44 B6 Liswerry Park Investigate culvert Short term 3days FTE M24 Drive maintenance responsibilities (0-5 years) plus £2k and risk of blockage. survey
B7 Inlet improvement works Short term £20-40k M33 allowance (0-5 years) (nominal estimate) B8 Monitor Ongoing N/A M53, M44 B9 Somerton Road Investigate culvert Short term 5days FTE M24, maintenance responsibilities (0-5 years) M34 and risk of blockage. Consider upstream attenuation options. B10 Enhanced highway drainage Ongoing N/A M35 maintenance. (Revenue) B11 Inlet improvement works Short term £20-40k M33 allowance (0-5 years) (nominal estimate) B12 Monitor Ongoing N/A M53 (Revenue) B13 Gibbs Road Investigate culvert and Short term 3days FTE M24 highway drainage (0-5 years) B14 Enhanced highway drainage Short term N/A M35 maintenance. (0-5 years) (Revenue) B15 Monitor Ongoing N/A M53, (Revenue) M44 Total (days non-revenue) 15days FTE & £30-57k
Recovery and review Preventing 6 5 7 5 Preparing Protecting
| Issue | 14 December 2015 Page 65 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.5 Beechwood Ward
7.5.1 Overview Beechwood Ward is situated in the central part of NCC, to the east of Central Newport. It has a population of approximately 7,58534 and an area of 1.52km2, which is approximately 0.7% of the total area of Newport37. The ward steeply slopes north to south and mainly consists of residential housing. The topography is similar to Alway ward. The centre of the ward consist of Beechwood Park. The Main River Usk borders the north of this ward
7.5.2 Ordinary watercourses and surface water flood risk The available data indicates some degree of high risk flooding associated with the area to the south of the ward from ordinary watercourses, ponding behind the railway embankment, which potentially affects a limited number of highways and properties in the south and east of the ward. Problems may also occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There are no reported instances of historical flooding from ordinary watercourses in this ward. The surface water flood maps show flooding potentially affecting roads and properties which can be broadly clustered into two main areas. The first runs from the top of Woodland Park Road in the centre of the ward down to Chepstow road in the South West of the ward. This shows potential overland flow of water with a medium/high risk to some properties. The second cluster is in the south of the ward adjacent to the ordinary watercourse in the vicinity of Conway Road alongside the railway and represents a medium/high risk. Other areas affected are generally classified as low risk, however there are a number of isolated areas of high/medium risk. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. Historic flood information details three instances of flooding due to surface water in Beechwood. These incidents relate to surface water flooding where the drainage systems cannot cope with high intensity rainfall. Table 23 – Recorded historic local flood events in Beechwood
Location of Historic Flooding Reason Heather Road, Beechwood Surface Water Flooding (Flash Flood) Christchurch Road, Beechwood Surface Water Flooding (Flash Flood) Woodland Road, Beechwood Surface Water Flooding (Flash Flood)
37 Beechwood Ward Profile (2014) Newport City Council
| Issue | 14 December 2015 Page 66 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The table below summarises the impacts of flooding in Beechwood based on the Surface Water Flood map, shown below. Table 24 – Flood Risk Mapping counts for Beechwood
Risk Counts Medium Low High Totals in (1 in 30 to (1 in 100 to (>1 in 30 Risk to People and Property Defined Area 1 in 100 1 in 1000 chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 7890 32 186 724 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 3401 4 46 205 Residential Properties Essential Services 27 0 0 1 Risk to Economic Activity
Non-Residential Properties in areas at risk of 60 1 2 18 flooding depth >0.2m
Primary/Trunk Roads (km) 28.1 0.8 2.3 8.6 Mail Line Railways (km) 0.00 0.00 0.00 0.00 Agricultural Land - Grades 1, 2 and 3 (ha) 150 0 0 0 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 2.45 0.00 0.00 0.02 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 2.45 0.00 0.00 0.02 (ha) Sites of Interest for Nature Conservation 1.77 0.00 0.01 0.05 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 0.00 0.00 0.00 0.00 Registered Parks and Gardens (ha) 11.96 0.23 0.34 0.87 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 Listed Buildings (n) 4 0 0 0 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha)
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 67 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 68 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.5.3 Groundwater There are no recorded groundwater flood incidents.
7.5.4 Sewer Flooding There are 7 reported instances of DG5 sewer flooding in this ward.
7.5.5 Measures to reduce local flood risk The main local flood risks are identified as follows: Conway Road – As with Somerton Road in Alway Ward, there are anecdotal reports of historic surface water flooding during intense rainfall as drainage systems serving the area south of Chepstow Road became overwhelmed. A high number of residential properties are predicted at high risk however no recent incidents have been recorded. Highway gullies drain into the combined sewer network. Culverts run adjacent and under the railway. Investigation into the arrangement and maintenance responsibilities is planned. St Julian’s Road / Lundy Drive – A small number of residential properties are predicted at risk where a topographic depression causes surface water to pond. Highway drainage gullies are understood to be served by a combined sewer network and some sewer flooding has been recorded. Further investigation is planned. Regular monitoring and gully clearance is planned. Liaison with DCWW is also proposed on surface water disconnection opportunities. Forest Glade / Woodland Road / Kensington Place – A number of residential properties are predicted to be at medium risk as a topographic depression causes surface water ponding. Historic flooding is recorded by NCC to one property and three flooding incidents have required Fire Service attendance. The area has a high number of trees and leaves which can clog or block highway gullies. Additional gullies have been recently installed by NCC. Investigation into disconnection of highway gullies and attenuation storage to hold back peak upstream flows in available open space in Woodland Park is planned. Regular monitoring and gully clearance is planned. Cotman Close – A cluster of several properties are predicted at low/medium risk of flooding. No incidents have been recorded and further investigation is planned, given the area is likely to benefit from adjacent motorway drainage.
| Issue | 14 December 2015 Page 69 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The following measures are identified to reduce flood risk. Table 25 - Local Flood Risk Management measures for Beechwood
Location and Measure Timescale Indicative Strategic Description Cost Context C1 Conway Road Investigate culvert Short term 3days FTE M24 maintenance (0-5 years) responsibilities and risk of blockage. C2 Enhanced highway Ongoing N/A M35 drainage maintenance. (Revenue) C3 Inlet improvement Short term £20-40k M33 works allowance (0-5 years) (nominal estimate) C4 Monitor Ongoing N/A M53, M44 (Revenue) C5 St Julian’s Road / Enhanced highway Ongoing N/A M35 Lundy Drive drainage maintenance. (Revenue) C6 Liaison with DCWW Short term 5days FTE M24, M34 on surface water sewer (0-5 years) disconnection opportunities. C7 Monitor Ongoing N/A M53, M44 (Revenue) C8 Forest Glade / Investigate highway Short term 3day FTE M24 Woodland Road / gully disconnection. (0-5 years) plus £5k Kensington Place survey
C9 Enhanced highway Ongoing N/A M35 drainage maintenance. (Revenue) C10 Monitor Ongoing N/A M53, M44 (Revenue) C11 Cotman Close Investigate drainage Short term 2days FTE M24 maintenance (0-5 years) responsibilities. C12 Monitor Ongoing N/A M53, M44 (Revenue) Total (non-revenue) 13 days FTE and £25- 45k
Recovery and review Preventing 4 4 4 5 Preparing Protecting
| Issue | 14 December 2015 Page 70 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.6 Bettws Ward
7.6.1 Overview Bettws Ward is situated in the northern part of NCC, to the north of Central Newport. It has a population of approximately 7,64434 and an area of 5.14km2, which is approximately 2.4% of the total area of Newport38. The ward gently slopes north-west to south-east, with predominantly residential housing. There is some commercial buildings within the valley floor. Surrounding this developed area the land-use is composed of forestry, livestock and arable fields. There are no Main Rivers in this ward.
7.6.2 Ordinary watercourses and surface water flood risk The available data indicates medium/high risk flooding from ordinary watercourses including the Malpas Brook running down the east edge of the ward, and a large flood storage area to the south of the ward. There are few residential properties in this area. In the more urbanised area running through the centre of the ward from east to west there are properties at medium/high risk of flooding. Problems may also occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There are no reported instances of historical flooding from ordinary watercourses in this ward. The surface water flood maps show flooding potentially affecting roads and properties which can be broadly clustered into three main areas running from east to west across the ward in the area encircled by Monnow Way Road. There are areas of medium and high risk. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. Historic flood information details one instance of flooding due to surface water in Bettws which is detailed in the table below. This reported flood incident relates to surface water flooding where the drainage systems cannot cope with high intensity rainfall. The reported flood incidents may also relate to blocked gullies or drains. Table 26 – Recorded historic flooding in Bettws
Location of Historic Flooding Reason Meon Close, Bettws Surface Water Flooding (Flash Flood)
38 Bettws Ward Profile (2014) Newport City Council
| Issue | 14 December 2015 Page 71 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The table below summarises the impacts of flooding in Bettws based on the Surface Water Flood map, shown below. Table 27 – Flood Risk Map counts for Bettws
Risk Counts Medium Low Totals in High (1 in 30 to (1 in 100 to Defined Area (>1 in 30 Risk to People and Property 1 in 100 1 in 1000 chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 7793 181 311 1148 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 3359 43 77 312 Residential Properties Essential Services 31 0 0 3 Risk to Economic Activity
Non-Residential Properties in areas at risk of 30 0 1 23 flooding depth >0.2m
Primary/Trunk Roads (km) 28.3 2.0 3.9 9.6 Mail Line Railways (km) 0.00 0.00 0.00 0.00 Agricultural Land - Grades 1, 2 and 3 (ha) 513 4 6 11 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 0.00 0.00 0.00 0.00 (ha) Sites of Interest for Nature Conservation 79.48 13.53 23.69 41.38 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 37.14 0.57 0.76 1.18 Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 Listed Buildings (n) 7 1 1 2 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha)
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 72 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 73 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.6.3 Groundwater There are no recorded groundwater flood incidents.
7.6.4 Sewer Flooding There are 3 reported instances of DG5 sewer flooding in this ward.
7.6.5 Measures to reduce local flood risk The main local flood risks are identified as follows: Monnow Way – a large number of residential properties and some services are predicted to be at low risk adjacent to the Malpas Brook. There are no reports of historical flooding in the area predicted and the area is served by an adjacent ordinary watercourse. Maintenance of the watercourse to maintain channel capacity and further monitoring is proposed. Meon Close - To the north of Monnow Way, historic surface water flooding is recorded, requiring fire service pumping. No surface water flooding is predicted and further investigation is proposed. Bettws Lane (adjacent to High School) – downstream of Monnow Way the highway gullies are prone to blockage from leaf debris causing surface water ponding. A high risk of surface water flooding is predicted. Regular monitoring and gully clearance is planned. Adjacent to Bettws Lane there are flood water storage lagoons where flood water is designed to attenuate during times of high flow, with the pass forward capacity controlled by a flood gate. NCC operate and maintain the structure. Further investigation into the control requirements is needed, and maintenance of a flood containment wall is planned. The structure will be evaluated as to whether it requires formal designation as a reservoir. Tone Close – a large number of residential properties and some services are predicted to be at low risk. There are no reports of historical flooding in the area. At the head of the topographic depression, the ordinary watercourse is culverted to the northeast. Further investigation of the inlet arrangement at Waveney Close is proposed. Parc-y-Brain Road – Surface runoff from adjacent land had been prone to causing highway flooding. The fire service was required to evacuate occupants of a stranded car. Improvement works by NCC including culvert upsizing and new highway gullies were completed in 2013. Their effectiveness will be monitored. Darent Road – Downstream of Parc-y-Brain Road, a large number of residential properties are predicted to be at high risk of surface water flooding, with the Bettws Brook running over Ogmore Crescent. The Ogmore Crescent, Bettws culvert inlet grid has been identified as ‘critical’ by NCC. There are no reports of historical flooding in the area. Further monitoring is proposed.
| Issue | 14 December 2015 Page 74 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The following measures are identified to reduce flood risk. Table 28 – Local Flood Risk Management measures for Bettws.
Location Measure Timescale Indicative Strategic and Cost Context Description D1 Monnow Enhanced watercourse Ongoing N/A M35 Way maintenance. (Revenue) D2 Monitor Ongoing N/A M53, (Revenue) M44 D3 Meon Close Investigate surface water Medium 3days FTE M24 flood risk. term (5-10 years) D4 Monitor Ongoing N/A M53, (Revenue) M44 D5 Bettws Lane Investigate downstream Short term 5 days FTE M24 flood attenuation structure. (0-5 years) plus £10k survey
D6 Nominal allowance for Short term £50k-£200k M33 repairs of downstream (0-5 years) nominal attenuation structure estimate D7 Enhanced highway drainage Ongoing N/A M35 maintenance. (Revenue) D8 Monitor Ongoing N/A M53, (Revenue) M44 D9 Tone Close Investigate inlet Medium 2days FTE M24 arrangement at Waveney term (5-10 plus £2k Close years) survey
D10 Monitor Ongoing N/A M53, (Revenue) M44 D11 Parc-y-Brain Monitor Ongoing N/A M53, Road (Revenue) M44 D12 Darent Road Monitor Ongoing N/A M53, (Revenue) M44 D13 Bettws Ward Investigate and promote Short term 10days FTE M31 application of Glastir (0-5 years) Advanced given potential suitability for land management practices to reduce flood risk and protect water supplies Total (non-revenue) 21days FTE and £71- 212k
Recovery and review Preventing 6 3 6 4 Preparing Protecting
| Issue | 14 December 2015 Page 75 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.7 Caerleon Ward
7.7.1 Overview Caerleon Ward is situated along the northern border of NCC, to the north-east of Central Newport. The suburban village has a population of approximately 7,97934 and an area of 14.53km2, which is approximately 5.4% of the total area of Newport39. The ward consists of two significant hills, to the west and east, which steeply slope down to the valley floor in the centre of Caerleon which comprises residential and commercial buildings. The River Usk and Afon Lwyd flow through the centre of the ward to their confluence west of the Celtic Manor.
7.7.2 Ordinary watercourses and surface water flood risk The available data indicates some areas of medium/high risk flooding from ordinary watercourses in the north of the ward and a patch of low risk in the south. Although there are few residential properties in these areas there is a risk that Ponthir Road could be affected. Problems may also occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There are two reported historical flooding incidents from ordinary watercourses. Table 29 – Recorded historic ordinary watercourse flooding in Caerleon
Location of Historic Flooding Reason St Cadoc's Close Surface water flooding, from natural exceedence of ordinary watercourse Bellin Close Surface water flooding, from natural exceedence of ordinary watercourse The surface water flood maps show flooding potentially affecting roads and properties which can be broadly clustered into three main areas towards the centre of the ward to the west of the river Usk. They are generally areas of low risk but with small spots of medium and high risk. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. There are two recorded instances of surface water flooding in Caerleon, detailed in the table below. This reported flood incident relates to surface water flooding where the drainage systems cannot cope with high intensity rainfall. The reported flood incidents may also relate to blocked gullies or drains. Table 30 – Recorded historic surface water flooding in Caerleon
Location of Historic Flooding Reason Ashwell Cottages, Caerleon Surface Water Flooding (Flash Flood) Roman Way Surface water flooding
39 Caerleon Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 76 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The table below summarises the impacts of flooding in Caerleon based on the Surface Water Flood map, shown below. Table 31 - Flood Risk Map counts for Caerleon
Risk Counts Low Medium High (1 in 100 Totals in (1 in 30 to (>1 in 30 to 1 in Risk to People and Property Defined Area 1 in 100 chance in 1000 chance in any year) chance in any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 8248 19 84 654 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 3555 4 11 91 Residential Properties Essential Services 67 0 0 1 Risk to Economic Activity Non-Residential Properties in areas at risk of 154 1 5 21 flooding depth >0.2m Primary/Trunk Roads (km) 69.3 1.5 3.9 12.0 Mail Line Railways (km) 3.70 0.14 0.45 1.12 Agricultural Land - Grades 1, 2 and 3 (ha) 1394 2 3 7 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 62.94 0.00 0.01 0.06 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 63.93 0.00 0.01 0.06 (ha) Sites of Interest for Nature Conservation 166.02 6.22 8.26 17.79 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 47.99 0.40 0.50 0.96 Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 70.68 0.33 0.76 3.13 Listed Buildings (n) 82 0 0 1 Essential Settings of Regional Planning 50.85 0.72 1.46 5.24 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 77 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 78 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.7.3 Groundwater There are no recorded groundwater flood incidents.
7.7.4 Sewer Flooding There are 28 reported instances of DG5 sewer flooding in this ward.
7.7.5 Measures to reduce local flood risk The main local flood risks are identified as follows: Isca Road – Highway ponding is recorded where discharge from gullies is restricted or locked during periods of high tide. NRW are proposing a tidal flood risk scheme in the area and continued partnership working between NRW and NCC is proposed to address residual surface water flood risk is proposed. Roman Way – Several culvert inlet grids are located in this area and have been prone to blockage. The Fire Service have recorded two incidents. NCC records surface water flooding in St Cadoc’s Close and Roman Way. A large number of properties are predicted at low/medium risk of flooding. Downstream services risk include the college and access route to the hospital, where Fire Service pumping has been recorded. Sewer flooding incidents are recorded. The culvert inlet screen adjacent to Gwladys Place has blockage issues and the St Cadoc’s Close inlet grid is identified by NCC as ‘critical’. Downstream there is open space which could be used as part of improvements to the existing drainage. Further investigation and monitoring is planned, including liaison with DCWW and investigation of the inlet grid arrangement. Roman Road – A large number of properties are predicted at low/medium risk of flooding. Whilst no surface water flooding incidents are recorded, some property sewer flooding incidents are recorded. The area is drained by Home Farm culvert to the adjacent River Usk. The surface water maps demonstrate the risk should the culvert block. Inspection and maintenance of the tidal flap, culvert inlet and liaison with DCWW is planned. Castle Street / High Street / Castle Close / Tram Road – Small numbers of properties and services are predicted at low/medium risk throughout the area. No surface water flooding is recorded however property sewer flooding incidents are recorded and the Fire Service has attended to pump flooding of the highway. Monitoring and liaison with DCWW is planned. Ponthir Road / Malthouse Road – A small number of properties and the highway are predicted at high risk. The watercourse runs under the road through a culvert. Maintenance and monitoring is planned. Bellin Close / Brooklea / Forge Close – A small number of properties are predicted at medium/low risk. Surface water flooding has been recorded at Bellin Close. The culvert inlet is located in a wooded area and is prone to blockages. The adjacent College ground may provide open space for mitigation measures such as additional conveyance options. NCC developed
| Issue | 14 December 2015 Page 79 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
an outline downstream culvert enhancement proposal which was unable to progress due to lack of funding. Further investigation and monitoring is planned. The following measures are identified to reduce flood risk. Table 32 - Local Flood Risk Management measures for Caerleon
Location and Measure Timescale Indicative Strategic Description Cost Context E1 Isca Road Partnership working with Ongoing N/A M35 NRW to reduce residual (Revenue) surface water risk. E2 Monitor Ongoing N/A M53, (Revenue) M44 E3 Roman Way Investigate culvert inlet Short term 5days FTE M24, screening arrangement (0-5 years) plus £5k M34 and liaison with DCWW surveys on surface water sewer disconnection opportunities. E4 Monitor Ongoing N/A M53, (Revenue) M44 E5 Roman Road Investigate culvert inlet Short term 5days FTE M24, and maintain tidal flap. (0-5 years) plus £5k M35, Liaison with DCWW on surveys M34 surface water disconnection opportunities E6 Monitor Ongoing N/A M53, (Revenue) M44 E7 Castle Street / Liaison with DCWW on Short term 5days FTE M24, High Street / surface water (0-5 years) plus £5k M35 Castle Close / disconnection surveys Tram Road opportunities E8 Monitor Ongoing N/A M53, (Revenue) M44 E9 Ponthir Road / Culvert maintenance Ongoing N/A M35 Malthouse Road (Revenue) E10 Monitor Ongoing N/A M53, (Revenue) M44 E11 Bellin Close / Investigate culvert inlet Short term 15days FTE M24, Brooklea / Forge arrangement, and (0-5 years) plus £5k M35, Close justification for surveys M34 downstream culvert enhancement scheme. E12 Culvert scheme Mid-term £50k-£150k M35 (5-10 nominal years) estimate E13 Monitor Ongoing N/A M53, (Revenue) M44 Total (non-revenue) 25days FTE and £70- 170k
Recovery and review Preventing 6 4 6 9 Preparing Protecting
| Issue | 14 December 2015 Page 80 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.8 Gaer Ward
7.8.1 Overview Gaer Ward is situated in the central part of NCC, to the south-west of Central Newport. It has a population of approximately 8,67234 and an area of 2.8km2, which is approximately 1.3% of the total area of Newport40. The ward gently slopes north to south, with residential housing concentrated to the east of the ward. The hillside catchment is drained by the Ebbw River which flows around hillside to the west of the ward.
7.8.2 Ordinary watercourses and surface water flood risk The available data indicates low risk of flooding from ordinary watercourses, however problems could occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There no reported instances of historical flooding from ordinary watercourses in this ward. The surface water flood maps show medium/high risk of flooding potentially affecting roads and properties which can be broadly clustered into two main areas; in the vicinity of Harlech Retail Park in the centre of the ward and near Docks Way in the south west of the ward. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. There are no reported instances of historical flooding from surface water in this ward. The table below summarises the impacts of flooding in Gaer based on the Surface Water Flood map, shown below.
40 Gaer Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 81 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 33 - Flood Risk Map counts for Gaer
Risk Counts Medium Low High Totals in (1 in 30 to (1 in 100 to (>1 in 30 Risk to People and Property Defined Area 1 in 100 1 in 1000 chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 9185 9 51 459 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 3959 0 7 98 Residential Properties Essential Services 36 0 0 4
Risk to Economic Activity Non-Residential Properties in areas at risk of 50 1 4 17 flooding depth >0.2m Primary/Trunk Roads (km) 37.5 1.6 4.2 12.3
Mail Line Railways (km) 3.47 0.03 0.20 0.64
Agricultural Land - Grades 1, 2 and 3 (ha) 281 0 0 0
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (ha) 0.00 0.00 0.00 0.00
Sites of Interest for Nature Conservation(ha) 43.25 3.15 3.88 5.08
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 0.00 0.00 0.00 0.00
Registered Parks and Gardens (ha) 72.39 2.62 3.64 7.75
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 9.50 0.00 0.01 0.09
Listed Buildings (n) 4 0 0 0 Essential Settings of Regional Planning 0.25 0.00 0.00 0.00 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 82 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 83 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.8.3 Groundwater There are no recorded groundwater flood incidents.
7.8.4 Sewer Flooding There are 8 reported instances of DG5 sewer flooding in this ward.
7.8.5 Measures to reduce local flood risk The main flood risks are identified as follows: Cardiff Road / Harlech Road – A small number of properties and the B4237 are predicted at low/medium risk of flooding. The Fire Service have recorded an incident of highway flooding to the north. To the south sewer flooding incidents are recorded. Monitoring and investigation into the condition and maintenance of the culvert under the railway which discharges into the Cefn Adda Reen is proposed, along with liaison with DCWW. St Brides Crescent - A large number of properties are predicted at low risk of flooding. No surface water flooding incidents are recorded. The area is served by a storm water pumping station, investigation into its maintenance and monitoring is planned. St Davids Crescent – A small number of properties are predicted at low risk of flooding. The Fire Service have recorded an incident of property flooding. Monitoring is proposed. Gaer Road / Dickens Drive – The highway is predicted at medium risk of flooding and the Fire Service have recorded an incident of highway flooding. Monitoring and a review of highway drainage maintenance is proposed. Gaer Ponds / Shakespeare Crescent – Flooding of the highway has been experienced. NCC have identified Gaer Ponds gully inlet as ‘critical’. Significant maintenance on the ponds was completed in 2014. Investigation and maintenance of the overflow culvert running under the railway is proposed, with monitoring. Docks Way / Maesglas Close – A small number of properties and the highway (A48) are predicted at low/medium risk of surface water flooding. Occasional highway surface water flooding is recorded. Anecdotal comments suggest that issues with the operation of the storm water pumping station may be a contributory factor. NCC storm pumping station is identified as ‘high risk’ and so has telemetry installed. Further investigation into the pumping station and monitoring is planned.
| Issue | 14 December 2015 Page 84 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The following measures are identified to reduce flood risk. Table 34 – Local Flood Risk Management measures identified for Gaer
Location and Measure Timescale Indicative Strategic Description Cost Context F1 Cardiff Road / Investigate culvert Short term 3days FTE M24, Harlech Road maintenance/condition (0-5 years) plus £5k M34 under railway. survey
F2 Liaison with DCWW on Short term 5days FTE M24, surface water sewer (0-5 years) M34 disconnection opportunities. F3 Monitor Ongoing N/A M53, (Revenue) M44 F4 St Brides Investigate storm water Short term 3days FTE M24, Crescent pumping station (0-5 years) M34 maintenance. F5 Monitor Ongoing N/A M53, (Revenue) M44 F6 St Davids Monitor Ongoing N/A M53, Crescent (Revenue) M44 F7 Gaer Road / Review and enhancement of Short term 3days FTE M35 Dickens Drive highway drainage (0-5 years) maintenance. F8 Monitor Ongoing N/A M53, (Revenue) M44 F9 Gaer Ponds / Investigation and Short term 3 days FTE M35 Shakespeare maintenance of overflow (0-5 years) and £3k Crescent culvert. survey F10 Routine pond maintenance Ongoing £15-25k M35 (nominal estimate) F11 Monitor Ongoing N/A M53, (Revenue) M44 F12 Maerglas Investigate storm water Short term 3days FTE M24, Close / Docks pumping station (0-5 years) M34 Road maintenance. F13 Monitor Ongoing N/A M53, (Revenue) M44 Total (non-revenue) 20days FTE and £20- 33k
Recovery and review Preventing 6 4 6 7 Preparing Protecting
| Issue | 14 December 2015 Page 85 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.9 Graig Ward
7.9.1 Overview Graig Ward is situated along the northern and western border of NCC, located to the west of Central Newport. It has a population of 6,11634 and an area of 14.34km2, which is approximately 6.6% of the total area of Newport41. The ward consists of a hill peak to the north, which steeply slopes down to the valley floor, west to east. There is limited development within this ward, mainly consisting of arable and livestock fields, however there is some housing concentrated to the east of the ward. The Main River Ebbw runs down the east boundary of this ward and the river Rhymney runs down the western boundary.
7.9.2 Ordinary watercourses and surface water flood risk The available data indicates some isolated patches of medium/high risk flooding from ordinary watercourses in the central and south east of the ward. Problems may also occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There are two reported instances of historical flooding from ordinary watercourses in Graig which are detailed in the table below:
Location of Historic Flooding Reason Springfield, Rhiwderin Surface water flooding caused by blocked trash screen and collapsed pipe Ffos-y-Fran, Bassaleg Surface water flooding from an ordinary watercourse, natural exceedence flood event The surface water flood maps show flooding potentially affecting roads and properties which can be broadly clustered into two main areas particularly around the south east area of the ward by Rhiwderin and Bassaleg. They are generally areas of low risk but with small spots of medium and high risk. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. Historic flood information details one instance of flooding due to surface water in Graig which is detailed in the table below. This reported flood incident relates to surface water flooding where the drainage systems cannot cope with high intensity rainfall. The reported flood incidents may also relate to blocked gullies or drains.
Location of Historic Flooding Reason Church Crescent, Bassaleg Surface Water Flooding (Flash Flood)
41 Graig Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 86 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The table below summarises the impacts of flooding in Graig based on the Surface Water Flood map, shown below. Table 35 - Flood Risk Map counts for Graig
Risk Counts Low Medium High (1 in 100 Totals in (1 in 30 to (>1 in 30 to 1 in Risk to People and Property Defined Area 1 in 100 chance in 1000 chance in any year) chance in any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 5765 53 102 371 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 2485 12 21 66 Residential Properties Essential Services 25 0 0 1 Risk to Economic Activity Non-Residential Properties in areas at risk of 33 2 4 14 flooding depth >0.2m Primary/Trunk Roads (km) 54.3 4.2 7.9 17.1 Mail Line Railways (km) 6.81 0.81 1.20 1.70 Agricultural Land - Grades 1, 2 and 3 (ha) 1434 18 29 74 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 3.76 0.00 0.03 0.30 (ha) Sites of Interest for Nature Conservation 149.44 5.85 7.76 11.98 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 212.00 1.19 1.79 4.25 Registered Parks and Gardens (ha) 7.93 0.17 0.31 0.83 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 2.32 0.00 0.01 0.02 Listed Buildings (n) 38 5 5 6 Essential Settings of Regional Planning 36.56 0.39 1.00 2.95 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 87 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 88 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.9.3 Groundwater There are no recorded groundwater flood incidents.
7.9.4 Sewer Flooding There are 5 reported instances of DG5 sewer flooding in this ward.
7.9.5 Measures to reduce local flood risk The main local flood risks are identified as follows: Park View / Pye Corner – Located on the boundary with Rogerstone, the highway is predicted to have a high risk of flooding at the railway underpass. Recurring surface water flooding is recorded, affecting residential gardens. Anecdotal comments that debris blockages of the ordinary watercourse has been a contributory factor; further investigation and liaison with riparian owners is planned. There are also property sewer flooding incidents from the combined network, and liaison with DCWW is also proposed. Rhiwderin – A small number of properties, services and the highway are predicted at high risk of flooding. Affected properties include Springfield Lane/Road, Caernarvon Road and Oaklands Park Drive. An historic surface water flooding incident is recorded and the Fire Service have recorded an incident of property flooding. The area is served by two culverted ordinary watercourses. Monitoring and further investigation into the arrangement of the inlet grids is planned. Some property sewer flooding is recorded and liaison with DCWW is also proposed as there are anecdotal comments of issues arising from the interaction between the storm and foul network. There may be opportunities to attenuate flows upstream. Bassaleg – A number of properties and services are predicted at high/medium risk of surface water flooding. Affected property locations include Farriers Gate, Churchmead, and upstream at Ffos-y-Fran/Caerphilly Road where a surface water flooding incident is recorded in the PFRA. A partially culverted ordinary watercourse runs through the affected area. Anecdotal comments are that mud on the public highway from farm vehicles makes highway drainage prone to blockage. NCC have recently worked with a riparian owner adjacent to Penylan Road to divert highway flooding into an adjacent ditch. Monitoring and investigation into the arrangement, condition, capacity and maintenance responsibilities of the culverts under the A467 and A468 is planned. There may be opportunities to attenuate flows upstream or improvements to the culvert. Some sewer flooding incidents are also recorded of the combined network, and liaison with DCWW is also proposed. Forge Lane – A number of properties are predicted at high risk of surface water flooding. The Forge Lane, Rogerstone culvert inlet screen is considered ‘critical’ by NCC. There may be opportunities to attenuate flows upstream or improvements to the culvert. Further investigation and monitoring is planned.
| Issue | 14 December 2015 Page 89 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The following measures are identified to reduce flood risk. Table 36 – Local flood risk management measures for Graig
Location and Measure Timescale Indicative Strategic Description Cost Context G1 Park View / Further investigation and Short term 3days FTE M24, M43 Pye Corner liaison with riparian (0-5 years) owners. G2 Liaison with DCWW on Short term 4days FTE M24, M34 surface water sewer (0-5 years) disconnection opportunities. G3 Monitor Ongoing N/A M53, M44 (Revenue) G4 Rhiwderin Further investigation into Short term 4days FTE M24, M35 culvert arrangement and (0-5 years) plus £2k inlet grids survey G5 Liaison with DCWW on Short term 4days FTE M24, M34 sewer improvement (0-5 years) opportunities. G6 Monitor Ongoing N/A M53, M44 (Revenue) G7 Bassaleg Investigation into the Short term 4days FTE M24 arrangement, condition, (0-5 years) plus £2k capacity and maintenance survey responsibilities of the culverts. G8 Liaison with DCWW on Short term 4days FTE M24, M34 surface water sewer (0-5 years) disconnection opportunities. G9 Monitor Ongoing N/A M53, M44 (Revenue) G10 Forge Lane Further investigation into Short term 3days FTE M24, M35 culvert arrangement and (0-5 years) plus £2k inlet grids survey G11 Monitor Ongoing N/A M53, M44 (Revenue) Total (non-revenue) 25days FTE and £6k
Recovery and review Preventing 3 6 4 4 Preparing Protecting
| Issue | 14 December 2015 Page 90 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.10 Langstone Ward
7.10.1 Overview Langstone Ward is situated along the northern and eastern border of NCC, located to the north-east of Central Newport. It has a population of 4,36634 and an area of 30.43km2, which is approximately 14.02% of the total area of Newport42. A hillslope ridge dominates the north of the ward, steeply sloping south to a valley containing residential properties. There is a short length of Main River in this ward.
7.10.2 Ordinary watercourses and surface water flood risk The available data indicates some isolated patches of medium/high risk flooding from ordinary watercourses in south of the ward. Problems may also occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There is one reported instance of historical flooding from ordinary watercourses in Langstone which is detailed in the table below:
Location of Historic Flooding Reason Ford Farm Lane Ordinary watercourses, properties flooded at Forge Farm Lane due to a blocked trash screen The surface water flood maps show two clusters of issues around Langstone and Llanmartin. They are generally areas of low risk but with small spots of medium and high risk. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. Historic flood information details two instances of flooding due to surface water in Langstone which are detailed in the table below. This reported flood incident relates to surface water flooding where the drainage systems cannot cope with high intensity rainfall. The reported flood incidents may also relate to blocked gullies or drains.
Location of Historic Flooding Reason A48 Chepstow Rd, Langstone Surface Water Flooding/culvert flooding Magor Road, nr j/w Waltwood Surface Water Flooding/culvert flooding Rd
42 Langstone Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 91 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The table below summarises the impacts of flooding in Langstone based on the Surface Water Flood map, shown below. Table 37 – Flood Risk Map counts for Langstone.
Risk Counts Medium Low Totals in High (1 in 30 to (1 in 100 to Defined (>1 in 30 Risk to People and Property 1 in 100 1 in 1000 Area chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 4081 23 58 258 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 1759 6 9 38 Residential Properties Essential Services 59 0 0 2 Risk to Economic Activity Non-Residential Properties in areas at risk of 50 5 7 24 flooding depth >0.2m Primary/Trunk Roads (km) 114.5 3.0 5.8 15.8 Mail Line Railways (km) 0.00 0.00 0.00 0.00 Agricultural Land - Grades 1, 2 and 3 (ha) 3035 10 19 58 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 15.44 0.00 0.01 0.07 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) (ha) 72.09 0.74 1.47 4.79 Sites of Interest for Nature Conservation 641.88 1.51 3.23 7.88 (SINC) (ha) National Nature Reserves (NNR) (ha) 23.98 0.00 0.01 0.04 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 502.93 0.70 1.88 4.00 Registered Parks and Gardens (ha) 3.52 0.09 0.10 0.11 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 17.49 0.36 0.77 2.40 Listed Buildings (n) 32 0 0 1 Essential Settings of Regional Planning 42.65 2.22 3.92 7.93 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 92 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 93 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.10.3 Groundwater There are no recorded groundwater flood incidents.
7.10.4 Sewer Flooding There are 6 reported instances of DG5 sewer flooding in this ward.
7.10.5 Measures to reduce local flood risk The main flood risks are identified as follows: Magor Road / Ford Farm Lane / Carpenter Close / Miller Close – A number of properties and highways are predicted at high/medium risk of surface water flooding. The Fire Service record an incident of external flooding. An earlier historic flooding incident is attributed to a blocked debris inlet screen and liaison with riparian owners regarding woodland management and blockage risk is planned, in addition to a review of the inlet arrangement and monitoring. Anecdotal comments also highlight concerns over downstream culvert capacity throttling flows; further investigation is proposed, with an allowance for works to upsize the culvert. Chepstow Road, Langstone - Immediately upstream of the above issue, a small number of properties, the highway (A48) and a service are predicted at risk of flooding. Recurrent surface water flooding of the road is recorded. The Fire Service record an incident of pumping flood water to clear the highway. Investigation into the upstream culvert inlet arrangement is proposed, with monitoring. Magor Road, Llanmartin – Waltwood Road is predicted at high risk of surface water flooding. Recurring surface water of the road is recorded. Recent works to improve highway drainage have been completed, including new gully connections. NCC identify the A48 Langstone inlet grid to be ‘critical’. The network discharges into a downstream watercourse and anecdotal comments are that this throttles the network due to lack of maintenance. Liaison with the riparian owner is planned, with monitoring. Anecdotal comments note problems with culvert inlet grid and further investigation, ongoing maintenance and monitoring is planned. Blossom Close / Priory Grove / Court Meadow – A number of clusters of properties and the highway are predicted at high/medium risk of surface water flooding. Whilst no historic surface water incidents are recorded by NCC, the Fire Service record a number of incidents of flooding of property. Anecdotal comments note problems with culvert inlet grid and further investigation, ongoing maintenance and monitoring is planned. Attenuation storage upstream of Priory Farm may be an option to hold back peak flows.
| Issue | 14 December 2015 Page 94 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Penhow, St Brides Brook – The A48 highway is predicted at high risk of surface water flooding and the Fire Service record two incidents of pumping flood water to clear the highway. NCC identify the A48 Penhow inlet grid to be ‘critical’. Anecdotal comments are that land drainage contributes to highway drainage issues and property flooding is experienced, and this is exacerbated by throttling due to restrictions downstream. The drainage network is complex and further investigation and monitoring is proposed.
| Issue | 14 December 2015 Page 95 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The following measures are identified to reduce flood risk. Table 38 – Local flood risk management measures for Langstone.
Location and Measure Timescale Indicative Strategic Description Cost Context H1 Magor Road / Ford Liaison with riparian Short term 1day FTE M24, M43 Farm Lane / owners regarding (0-5 years) Carpenter Close / woodland Miller Close management. H2 Investigation into Short term 3days FTE M24, culvert capacity, (0-5 years) plus £2k M35, M44 arrangement and inlet survey grids H3 Works to increase Short term £20-80k M33, M34 culvert capacity (0-5 years) (nominal estimate) H4 Monitor Ongoing N/A M53, M44 (Revenue) H5 Chepstow Road, Further investigation Short term 3days FTE M24, M35 Langstone into upstream culvert (0-5 years) arrangement and inlet grids H6 Monitor Ongoing N/A M53, M44 (Revenue) H7 Magor Road, Liaison with riparian Short term 1day FTE M24, M43 Llanmartin owners. (0-5 years) H8 Investigation into Short term N/A M53, M44 culvert capacity, (0-5 years) arrangement and inlet grids H9 Works to increase Short term £20-80k M33, M34 culvert capacity (0-5 years) (nominal estimate) H10 Monitor Ongoing N/A M53, M44 (Revenue) H11 Blossom Close / Investigation into Short term 4days FTE M24, M35 Priory Grove / culvert inlet grid (0-5 years) plus £5k Court Meadow arrangement and survey maintenance H12 Works to inlets Short term £10-40k M33, M34 culvert grid (0-5 years) (nominal estimate) H13 Monitor Ongoing N/A M53, M44 (Revenue) H14 Penhow, St Brides Further investigation Short term 3days FTE M24 Brook into drainage (0-5 years) plus £3k arrangement. survey H15 Monitor Ongoing N/A M53, M44 (Revenue) Total (non-revenue) 15days FTE & £60-210k
Recovery and review Preventing 6 6 9 9 Preparing Protecting
| Issue | 14 December 2015 Page 96 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.11 Liswerry Ward
7.11.1 Overview Liswerry Ward is stretches along the coast of NCC up to the southern edge of Central Newport. It has a population of 12,69434 and an area of 18.59km2, which is approximately 8.6% of the total area of Newport43. The ward is mainly flat, with limited variations in elevation, and mainly consists of industrial, residential and commercial developments. A large proportion of the wards in the south is rural. The Main Rivers consist of the Usk which runs down the east boundary of the ward and Liswerry Pill Reen and Great Spytty Reen which run east to west across the north of the ward. Some of the ward falls within the Caldicot Level drainage district.
7.11.2 Ordinary watercourses and surface water flood risk The available data indicates some isolated patches of low risk flooding from ordinary watercourses. Problems may occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There are no reported instances of historical flooding from ordinary watercourses in Liswerry. The surface water flood maps show no significant clusters of issues within Liswerry. The area is generally low risk with some properties in the north of the ward being at low risk of flooding. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. A number of surface water pumping stations operate to reduce the risk of surface water flooding, and flooding due to tide-lock. Historic flood information details instances of flooding due to surface water in Liswerry which are detailed in the table below. There are also anecdotal reports of surface water flooding in November 2011 to Rodney Parade and across the Maindee area.This reported flood incident relates to surface water flooding where the drainage systems cannot cope with high intensity rainfall. The reported flood incidents may also relate to blocked gullies or drains.
Location of Historic Flooding Reason Stephenson Street Highway drainage and combined sewer issue. The table below summarises the impacts of flooding in Liswerry based on the Surface Water Flood map, shown below.
43 Liswerry Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 97 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 39 – Flood Risk Map counts for Liswerry
Risk Counts Medium Low High Totals in (1 in 30 to (1 in 100 to (>1 in 30 Risk to People and Property Defined Area 1 in 100 1 in 1000 chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 11830 0 14 833 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 5099 0 0 196 Residential Properties Essential Services 168 0 0 4 Risk to Economic Activity Non-Residential Properties in areas at risk of 385 5 11 56 flooding depth >0.2m Primary/Trunk Roads (km) 80.8 0.8 3.9 22.1 Mail Line Railways (km) 7.10 0.03 0.05 0.11 Agricultural Land - Grades 1, 2 and 3 (ha) 1514 0 2 18 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 128.29 0.00 0.00 0.02 Special Protection Areas (SPA) (ha) 34.95 0.00 0.00 0.02 Ramsar Sites (ha) 34.95 0.00 0.00 0.02 Sites of Special Scientific Interest (SSSI) 706.70 0.00 0.12 8.70 (ha) Sites of Interest for Nature Conservation 328.58 0.00 0.16 4.98 (SINC) (ha) National Nature Reserves (NNR) (ha) 220.04 0.00 0.00 1.31 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 0.00 0.00 0.00 0.00 Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 Listed Buildings (n) 8 0 0 0 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha) RSPB Bird Reserves (ha) 6.41 0.00 0.00 0.06
| Issue | 14 December 2015 Page 98 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 99 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.11.3 Groundwater There are no recorded groundwater flood incidents.
7.11.4 Sewer Flooding There are 12 reported instances of DG5 sewer flooding in this ward.
7.11.5 Measures to reduce local flood risk The main flood risks are identified as follows: Stephenson Street – A high risk of surface water flooding is predicted with the resultant ponding impacting on the highway, which provides the sole access to an industrial estate. NCC records suggest that this is a recurring issue, with anecdotal comments that the highway drainage discharges to the sewer network which is prone to blockage due to the relatively shallow gradient. Further investigation and monitoring is planned, with DCWW liaison into sewer surface water disconnection options. Corporation Road / Southern Distributor Road – There is a high risk of surface water flooding of the highway (A48), ponding under the railway bridge. The culverted Great Spytty Reen drains through the area and anecdotal comments suggest localised flooding occurs approximately annually. The Reen is prone to tide-lock and liaison with NRW is proposed, with ongoing monitoring. Walsall Street / Dudley Street – There are a large number of properties with a low risk of surface water flooding in the area. The area is at a lower level than the adjacent Willenhall Street. This is a residual risk, with the dominant flood risk being tidal flooding from the adjacent Main River. The area is relatively flat and understood to be drained by the combined sewer network and opportunities for surface water attenuation storage to hold back peak flows should be investigated. No flooding incidents have been recorded. Liaison with DCWW with ongoing monitoring is planned. Corporation Street / Colston Avenue – The highway is predicted at low risk of surface water flooding. Anecdotal comments suggest flooding has been experienced following issues with the adjacent pumping station and screening however the asset has been subsequently refurbished. Investigation into the ownership and maintenance is planned, with ongoing monitoring. Stephenson Street Industrial Estate – Whilst no significant surface water flooding is predicted, the area drains into surface water storage ponds before discharging to the River Usk. Investigation into the ownership and maintenance of these structures is planned. Thompson Avenue – There is a high risk of highway flooding predicted. The area is served by a culvert, draining to the Liswerry Pill Reen and no historic flooding is recorded. Investigation and monitoring of this culvert is proposed, since it also serves a largely residential area of the adjacent Alway Ward to the north. Maintenance of the culvert under the rear gardens of properties is challenging. Investigation into ownership and inlet arrangement is planned.
| Issue | 14 December 2015 Page 100 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Traston Avenue – Whilst there is no predicted surface water flood risk, anecdotal comments suggest the area may be prone to elevated groundwater causing nuisance of saturated gardens. Investigation into the maintenance of the adjacent watercourses is planned, noting that the area is prone to tidal lock from the Great Spytty Reen. Liaison with NRW is also planned. The following measures are identified to reduce flood risk. Table 40 – Local Flood Risk Management measures for Liswerry
Location and Measure Timescale Indicative Strategic Description Cost Context I1 Stephenson Investigation into highway Short term 3days FTE M24, Street drainage (0-5 years) plus £2k M35 survey I2 Liaison with DCWW on Short term 5days FTE M24, surface water disconnection. (0-5 years) M34 I3 Nominal improvement Short term £10-20k M33, works to highway drainage (0-5 years) (nominal M34 estimate) I4 Monitor Ongoing N/A M53, (Revenue) M44 I5 Corporation Partnership working with Ongoing N/A M35 Road / NRW wrt Reen (Revenue) I6 Southern Monitor Ongoing N/A M53, Distributor (Revenue) M44 Road I7 Walsall Street / Liaison with DCWW on Short term 5days FTE M24, Dudley Street surface water disconnection. (0-5 years) M34 I8 Monitor Ongoing N/A M53, (Revenue) M44 I9 Corporation Investigate ownership/ Short term 1day FTE M33, Street / Colston maintenance of drainage (0-5 years) M34 Avenue assets I10 Monitor Ongoing N/A M53, (Revenue) M44 I11 Stevenson Investigate ownership/ Short term 1day FTE M33, Street maintenance of drainage (0-5 years) M34 Industrial assets Estate I12 Thompson Investigation into culvert Short term 5days FTE M24, Avenue ownership/maintenance, and (0-5 years) plus £2k M35 inlet arrangement. survey I13 Monitor Ongoing N/A M53, (Revenue) M44 I14 Traston Partnership working with Ongoing N/A M35 Avenue NRW wrt Reen (Revenue) I15 Investigation into Short term 3days FTE M24, watercourse maintenance. (0-5 years) M35 I16 Monitor Ongoing N/A M53, (Revenue) M44 Total (non-revenue) 23days FTE and £14- 24k
Recovery and review Preventing 6 3 6 11 Preparing Protecting
| Issue | 14 December 2015 Page 101 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.12 Llanwern Ward
7.12.1 Overview Llanwern Ward is the largest ward and is situated along the southwest coast of NCC. It has a population of 2,95234 and an area of 52.83km2, which is approximately 24% of the total area of Newport44. Llanwern is mainly flat, apart from a rise in elevation along the northern ward boundary. The land use within the ward consists of a large industrial development, and arable and livestock farmland. There are several Main Rivers in the ward; Monks’ Ditch runs through the central west of the ward and Hundred Perches Reen runs through the central east of the ward. Other Main Rivers include Windmill Reen, Ridings Reen and Elver Pill Reen. Much of the ward falls within the Caldicot Level drainage district.
7.12.2 Ordinary watercourses and surface water flood risk The available data indicates some isolated patches of medium/high risk flooding from ordinary watercourses however these are only present in a few patches to the north of the ward. Problems may also occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There is one reported instance of historical flooding from ordinary watercourses:
Location of Historic Flooding Reason Station Road, Llanwern Surface water flooding caused by Monks’ Ditch overflowing natural exceedence
The surface water flood maps show three main clusters of issues around Llanwern and Bishton in the north of the ward. They are generally of medium/high risk but with few properties. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. Historic flood information details three instances of flooding due to surface water in Llanwern which are detailed in the table below. This reported flood incident relates to surface water flooding where the drainage systems cannot cope with high intensity rainfall. The reported flood incidents may also relate to blocked gullies or drains.
Location of Historic Flooding Reason Bishton Rd, between Waltwood Rd and Bishton Surface Water Flooding/culvert flooding Llanwern Village Surface Water Flooding/culvert flooding Lanstone Lane, Lanwern Village Surface Water Flooding/culvert flooding
44 Llanwern Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 102 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The table below summarises the impacts of flooding in Llanwern based on the Surface Water Flood map, shown below. Table 41 – Flood Risk Map counts for Llanwern
Risk Counts Low Medium High (1 in 100 Totals in (1 in 30 to 1 (>1 in 30 to 1 in Risk to People and Property Defined Area in 100 chance in 1000 chance in any year) chance in any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 2909 7 30 211 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 1254 3 8 24 Residential Properties Essential Services 149 0 1 2 Risk to Economic Activity Non-Residential Properties in areas at risk of 47 3 7 42 flooding depth >0.2m Primary/Trunk Roads (km) 75.4 3.5 5.3 12.7 Mail Line Railways (km) 5.66 0.02 0.07 0.72 Agricultural Land - Grades 1, 2 and 3 (ha) 3988 5 10 64 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 37.30 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 37.30 0.00 0.00 0.00 Ramsar Sites (ha) 37.30 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 2541.10 3.62 9.62 69.88 (ha) Sites of Interest for Nature Conservation 339.24 2.12 3.29 9.32 (SINC) (ha) National Nature Reserves (NNR) (ha) 221.27 0.00 0.00 1.95 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 94.46 0.37 0.71 2.33 Registered Parks and Gardens (ha) 89.12 4.15 5.35 10.24 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 8.80 0.00 0.00 0.10 Listed Buildings (n) 16 0 0 0 Essential Settings of Regional Planning 45.93 3.71 5.37 9.06 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 103 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 104 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.12.3 Groundwater There are no recorded groundwater flood incidents.
7.12.4 Sewer Flooding There are 3 reported instances of DG5 sewer flooding in this ward.
7.12.5 Measures to reduce local flood risk The main flood risks are identified as follows: Station Road, Llanwern - Located adjacent to the Main River Monks’ Ditch, a small number of properties and services are predicted at risk of surface water flooding. The Llanwern Village culvert inlet grid has been identified as ‘critical’ by NCC. The Fire Service record three incidents pumping water out from flooded properties. Historic surface water flooding incidents are recorded by NCC, however significant desilting of surface water drainage in 2013 has subsequently been completed. Monitoring is proposed. Langstone Road, Llanwern – Located upstream of Station Road, recurrent highway ponding is recorded by NCC. Investigations recently completed by NCC identified the cause as culvert capacity restrictions due to tree roots and a scheme is proposed to replace and upsize the culvert. A funding application by the Community Council is ongoing and monitoring is proposed. Waltwood Road / Birch Road, Underwood – A cluster of properties are predicted at medium flood risk. Although no flooding is recorded by NCC, nearby the Fire Service recorded an incident of pumping of the flooded highway. Further investigation and monitoring is proposed. Bishton – A number of properties are predicted at medium risk of surface water flooding. No incidents are recorded within the village although upstream NCC record recurring flooding of the highway between Waltwood Road and Bishton. Additional gullies and culvert upsizing was completed by NCC in 2014 as part of a highway enhancement scheme. Further monitoring is planned. The following measures are identified to reduce flood risk.
| Issue | 14 December 2015 Page 105 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 42 – Local Flood Risk Management measures for Llandwern
Location and Measure Timescale Indicative Cost Strategic Description Context J1 Station Road, Monitor Ongoing N/A (Revenue) M53, M44 Llanwern J2 Langstone Lane, Culvert Short term (170m upsize M33, M34 Llanwern improvement (0-5 years) from 225dia to works 450dia) £30-50k (nominal estimate) J3 Monitor Ongoing N/A (Revenue) M53, M44 J4 Waltwood Road / Investigate Short term 3 days FTE and M24 Birch Road, (0-5 years) £2k survey J5 Underwood Monitor Ongoing N/A (Revenue) M53, M44 J6 Bishton Monitor Ongoing N/A (Revenue) M53, M44 Total (non-revenue) 3days FTE and £32-52k
Recovery and review Preventing 4 1 4 2 Preparing Protecting
| Issue | 14 December 2015 Page 106 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.13 Malpas Ward
7.13.1 Overview Malpas Ward is situated along the northern border of NCC, to the north of Central Newport. It has a population of 7,84434 and an area of 2.1km2, which is approximately 1.0% of the total area of Newport45. The ward gently slopes southwards and consists of predominately residential housing. The Main River Usk borders the south east of the ward for a short length.
7.13.2 Ordinary watercourses and surface water flood risk The available data indicates some isolated patches of medium/high risk flooding from ordinary watercourses running down the eastern boundary of the ward. Problems may also occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There are no reported instances of historical flooding from ordinary watercourses in Malpas. The surface water flood maps show two main clusters of issues around Malpas in the centre/east of the ward adjacent to Rowan Way. There are two patches of high risk areas here with some properties potentially affected. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. Historic flood information details four instances of flooding due to surface water in Malpas which are detailed in the table below. These reported flood incidents relate to surface water flooding where the drainage systems cannot cope with high intensity rainfall. The reported flood incidents may also relate to blocked gullies or drains.
Location of Historic Flooding Reason Larch Grove, Malpas Surface Water Flooding (Flash Flood) Almond Drive, Malpas Surface Water Flooding (Flash Flood) Llanover Close, Malpas Surface Water Flooding (Flash Flood) Wavell Drive, Malpas Surface Water Flooding (Flash Flood)/culvert flooding The table below summarises the impacts of flooding in Malpas based on the Surface Water Flood map, shown below.
45 Malpas Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 107 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 43 – Flood Risk Map counts for Malpas
Risk Counts Medium Low High Totals in (1 in 30 to (1 in 100 to (>1 in 30 Risk to People and Property Defined Area 1 in 100 1 in 1000 chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 7939 12 46 295 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 3422 3 9 44 Residential Properties Essential Services 27 0 0 1 Risk to Economic Activity Non-Residential Properties in areas at risk of 29 1 1 2 flooding depth >0.2m Primary/Trunk Roads (km) 31.5 0.5 1.6 5.6 Mail Line Railways (km) 0.00 0.00 0.00 0.00 Agricultural Land - Grades 1, 2 and 3 (ha) 206 0 0 1 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 3.41 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 3.41 0.00 0.00 0.00 (ha) Sites of Interest for Nature Conservation 12.37 0.68 1.22 1.93 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 3.22 0.06 0.12 0.24 Registered Parks and Gardens (ha) 0.07 0.00 0.00 0.02 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 Listed Buildings (n) 8 0 0 0 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 108 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 109 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.13.3 Groundwater There are no recorded groundwater flood incidents.
7.13.4 Sewer Flooding There are 12 reported instances of DG5 sewer flooding in this ward.
7.13.5 Measures to reduce local flood risk The main flood risks are identified as follows: Larch Grove / Pilton Vale – Two clusters of properties are predicted at high risk of surface water flooding. Surface water flooding is recorded to eight properties and the Fire Service record pumping of flood water from the highway and properties. Anecdotal comments suggest this is on the alignment of a historic stream and ponding risk is exacerbated by a former railway embankment downstream. Some property sewer flooding incidents are recorded, but the sewerage is recorded as a separate foul and storm system. To the north, the site of a historic spring causes intermittent land drainage issues and NCC have historically constructed an interception trench to divert flows away from properties. Discussions into the ownership of the surface water sewerage are ongoing. Investigation to reduce the risk of overland flow ponding behind the embankment, monitoring and liaison with DCWW is proposed. Almond Drive / Japonica Close – Surface water flooding is predicted to a small number of properties, with ponding upstream of the former railway embankment. NCC are working to reduce the risk of surface water runoff from Malpas Park Primary school and modest attenuation works are proposed to hold back peak flows, with further monitoring. Larch Court / Larch Grove – A small number of properties and the highway are predicted at medium risk of surface water flooding. Anecdotal comments are that there has been recent carriageway flooding and liaison with the (unadopted) highway owner is proposed to progress improvements to highway drainage, with ongoing monitoring. Horrocks Close – A small number of properties are predicted at low risk of surface water flooding along the line of an historic watercourse. Some property sewer flooding incidents are recorded, but the sewerage is recorded as a separate foul and storm system. Liaison with DCWW and ongoing monitoring is proposed. Malpas Road North, Alanbrooke Avenue – Whilst no surface water flooding to property is predicted, anecdotal comments suggest that highway drainage risk to property has been experienced. Works to address maintenance issues with storm drainage and monitoring are proposed. Graig Park Road – A cluster of properties are predicted at risk of surface water flooding. NCC recently replaced the surface water culvert but the area is in a topographic depression and ongoing monitoring is planned.
| Issue | 14 December 2015 Page 110 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The following measures are identified to reduce flood risk. Table 44 – Local Flood Risk Management measures for Malpas
Location and Measure Timescale Indicative Strategic Description Cost Context K1 Larch Grove / Investigation into Short term 3 days FTE M53, M44 Pilton Vale ownership of (0-5 years) and £1k sewerage. survey K2 Investigate risk and Short term 3 days FTE M24 mitigation of (0-5 years) and £2k ponding. survey K3 Liaison with Ongoing N/A M53, M44 DCWW. (Revenue) K4 Monitor Ongoing N/A M53, M44 (Revenue) K5 Almond Drive / Works to address Short term £10k nominal M24 Japonica Close surface water (0-5 years) estimate runoff. K6 Monitor Ongoing N/A M53, M44 (Revenue) K7 Larch Court / Liaison with Short term 1day FTE M24 Larch Grove highway drainage (0-5 years) owner K8 Monitor Ongoing N/A M53, M44 (Revenue) K9 Horrocks Close Liaison with Ongoing N/A M53, M44 DCWW. (Revenue) K10 Monitor Ongoing N/A M53, M44 (Revenue) K11 Malpas Road / Drainage Short term £10-15k M24 Alanbrooke improvement works (0-5 years) (nominal Avenue estimate) K12 Monitor Ongoing N/A M53, M44 (Revenue) K13 Graig Park Road Monitor Ongoing N/A M53, M44 (Revenue) Total (non-revenue) 7days FTE and £23-28k
Recovery and review Preventing 9 4 9 0 Preparing Protecting
| Issue | 14 December 2015 Page 111 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.14 Marshfield Ward
7.14.1 Overview Marshfield Ward is situated along the coast and the edge of the western border of NCC, to the south-west of Central Newport. It has a population of 6,30334 and an area of 44.81km2, which is approximately 20.6% of the total area of Newport46. The ward gently slopes north to south, onto the valley plain, which consists of livestock and arable farmland. There is some industrial development to the north- east of the ward. Main rivers include Drenewydd Reen, Broadway Reen, Rhosog Fawr Reen, Tarwick Reen, Hawse Reen, Wharf Reen, Newgout Pill, Pont-y-cw cw, Gout Fawr Pill and the Ebbw River. Much of the ward is within the Wentlooge Level drainage district.
7.14.2 Ordinary watercourses and surface water flood risk The available data indicates some limited areas of low risk flooding from ordinary watercourses with one larger low to medium risk area in the centre of the ward near Coedkernew. Higher risk flooding problems may also occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There are two reported instances of historical flooding from ordinary watercourses in Marshfield which are detailed in the table below:
Location of Historic Flooding Reason St Alban's Cottage, St Mellon's Surface water flooding, natural exceedence from Road ordinary watercourse Woodside, Duffryn Surface water flooding caused by Tredegar Reen overflowing, natural exceedence from ordinary watercourse The surface water flood maps show three main clusters of issues spread throughout the central belt of the ward at Marshfield, Imperial Park and Duffryn Drive. Most of these areas are low risk associated with the watercourses and reens. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. Historic flood information details one instance of flooding due to surface water in Marshfield which is detailed in the table below. These reported flood incidents relate to surface water flooding where the drainage systems cannot cope with high intensity rainfall. The reported flood incidents may also relate to blocked gullies or drains.
46 Marshfield Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 112 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Location of Historic Flooding Reason Nantymor Cottages, Surface Water Flooding (Flash Flood) Coedkernew The table below summarises the impacts of flooding in Marshfield based on the Surface Water Flood map, shown below. Table 45 – Flood Risk Map counts for Marshfield.
Risk Counts Low Medium High (1 in 100 Totals in (1 in 30 to (>1 in 30 to 1 in Risk to People and Property Defined Area 1 in 100 chance in 1000 chance in any year) chance in any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 5928 12 16 135 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 2555 4 5 32 Residential Properties Essential Services 69 0 0 0 Risk to Economic Activity Non-Residential Properties in areas at risk of 119 4 6 23 flooding depth >0.2m Primary/Trunk Roads (km) 128.2 4.1 8.4 24.8 Mail Line Railways (km) 5.95 0.00 0.00 0.02 Agricultural Land - Grades 1, 2 and 3 (ha) 3538 26 53 215 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 117.64 0.00 0.03 0.17 Special Protection Areas (SPA) (ha) 117.63 0.00 0.03 0.17 Ramsar Sites (ha) 117.63 0.00 0.03 0.17 Sites of Special Scientific Interest (SSSI) 1882.25 8.82 23.45 132.77 (ha) Sites of Interest for Nature Conservation 25.38 0.24 0.47 1.39 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 7.13 0.06 0.08 0.26 Registered Parks and Gardens (ha) 50.03 0.38 0.98 5.06 Country Parks (ha) 34.04 0.17 0.55 4.07 Scheduled Ancient Monuments (SAM) (ha) 2.70 0.01 0.02 0.03 Listed Buildings (n) 27 2 2 5 Essential Settings of Regional Planning 54.31 0.07 0.27 0.85 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 113 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 114 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.14.3 Groundwater There are no recorded groundwater flood incidents.
7.14.4 Sewer Flooding There are 71 reported instances of DG5 sewer flooding in this ward. The majority of these are in a cluster to the south west of the ward.
7.14.5 Measures to reduce local flood risk The main flood risks are identified as follows: Marshfield – The highway and a small number of properties are predicted at medium/low risk of surface water flooding throughout the community. An incident of surface water flooding is recorded. The highway has been re- profiled at Cambrian Way to divert overland flow. Property sewer flooding is also recorded and anecdotal comments suggest that highway drainage connects to the shallow sewer network. The drainage network is prone to siltation and an enhanced regime of planned desilting is proposed, with liaison with NRW and DCWW, and ongoing monitoring. Blacksmiths Way / Nant-y-moor – Properties and the highway (A48) are predicted at high risk of surface water flooding. Property flooding due to surface water is recorded and the Fire Service have recorded two incidents of pumping out flood water from property. Two culverts drain into the Nanymoor Reen and investigation into its ownership and maintenance is proposed. The culverts are maintained by riparian owners and liaison is proposed. Upstream the catchment is rural and relatively small and so investigation into catchment management is also planned, with ongoing monitoring. Jamaica Close / Dyffryn Drive / Woodside Estate (see also Section 7.21.5, Tredegar Ward) – A large number of properties are predicted at low risk of surface water flooding. An incident of surface water flooding is recorded at Woodside, attributed to the capacity of the ordinary watercourse. The location is immediately downstream of Tredegar Park Lake reservoir which is culverted to discharge into Tredegar Reen. Investigation into the maintenance of the culvert and reen is planned, with ongoing monitoring. The Tredegar Reen, Duffryn culvert inlet grid has been identified as ‘critical’ by NCC. Pound Hill / A48 – The highway (A48) is predicted at low risk of surface water flooding. Whilst the adjacent M4 drainage manages much of the risk, anecdotal comments suggest land drainage or groundwater flooding of the highway is not uncommon. Further investigation and monitoring is planned.
| Issue | 14 December 2015 Page 115 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The following measures are identified to reduce flood risk. Table 46 – Local Flood Risk Management measures for Marshfield
Location and Measure Timescale Indicative Strategic Description Cost Context L1 Marshfield Enhanced drainage Ongoing N/A (Revenue) M35 desilting. L2 Liaison with Ongoing N/A (Revenue) M53, M44 DCWW and NRW L3 Monitoring Ongoing N/A (Revenue) M53, M44 L4 Blacksmiths Way Liaison with Short term 1day FTE M24, M43 / Nant-y-moor riparian owners (0-5 years) L5 Investigation into Short term 10days FTE M24, M35 upstream catchment (0-5 years) plus £8k survey management allowance
L6 Monitoring Ongoing N/A (Revenue) M53, M44 L7 Jamaica Close / Investigate culvert Short term 4days FTE plus M24, M35 Dyffryn Drive / and reen (0-5 years) £2k survey Woodside maintenance / inlet L8 Monitoring Ongoing N/A (Revenue) M53, M44 L9 Pound Hill / A48 Investigate land Short term 4days FTE plus M24, M35 drainage and (0-5 years) £8k survey ground water issue allowance L10 Monitoring Ongoing N/A (Revenue) M53, M44 Total (non-revenue) 19days FTE and £18k
Recovery and review Preventing 5 4 6 4 Preparing Protecting
| Issue | 14 December 2015 Page 116 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.15 Pillgwenlly Ward
7.15.1 Overview Pillgwenlly Ward is situated in the central part of NCC, to the immediate south of Central Newport. It has a population of 7,49034 and an area of 6.43km2, which is approximately 2.96% of the total area of Newport47. The ward is flat and contains industrial, commercial and some residential properties. Alexandra Docks is located to the south of the ward. The main River Ebbw flows along the boundary of the ward, to the south-west and the Usk to the east.
7.15.2 Ordinary watercourses and surface water flood risk The available data indicates that limited areas of low risk flooding from ordinary watercourses. Problems may occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There are no reported instances of historical flooding from ordinary watercourses in Pillgwenlly. The surface water flood maps show isolated areas of low risk flooding with one a few small areas of high risk flooing. The main areas of properties affected is in the north of the ward in the vicinity of the Enterprise Park and is low risk only. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. A number of surface water pumping stations operate to reduce the risk of surface water flooding, and flooding due to tide-lock. Historic flood information details one instance of flooding due to surface water in Pillgwenlly which is detailed in the table below. This reported flood incident relates to a storm water pumping station.
Location of Historic Flooding Reason Docks Way, under Rail Bridge, Storm pumping station issue Maesglas The table below summarises the impacts of flooding in Pillgwennlly based on the Surface Water Flood map, shown below.
47 Pillgwenlly Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 117 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 47 – Flood Risk Map counts for Pillgwenlly
Risk Counts Low Medium High (1 in 100 Totals in (1 in 30 to (>1 in 30 to 1 in Risk to People and Property Defined Area 1 in 100 chance in 1000 chance in any year) chance in any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 7303 9 114 1206 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 3148 4 20 355 Residential Properties Essential Services 108 1 1 5 Risk to Economic Activity Non-Residential Properties in areas at risk of 423 2 28 149 flooding depth >0.2m Primary/Trunk Roads (km) 47.4 1.1 4.2 16.1 Mail Line Railways (km) 5.43 0.16 0.43 1.18 Agricultural Land - Grades 1, 2 and 3 (ha) 548 0 0 0 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 72.87 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.25 0.00 0.00 0.00 Ramsar Sites (ha) 0.25 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 84.12 0.00 0.02 0.12 (ha) Sites of Interest for Nature Conservation 8.26 0.02 0.29 0.39 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 0.00 0.00 0.00 0.00 Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 Listed Buildings (n) 17 0 0 0 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 118 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 119 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.15.3 Groundwater There are no recorded groundwater flood incidents.
7.15.4 Sewer Flooding There are 7 reported instances of DG5 sewer flooding in this ward.
7.15.5 Measures to reduce local flood risk The main flood risks are identified as follows: Usk Way / Docks Way – The highway is predicted at high risk of surface water flooding. The partially-culverted Twenty-Acres Reen drains the area and a significant upstream development. Further investigation into the maintenance and operation of the highway drainage and reen is proposed, with ongoing monitoring. Commercial Road / Ruperra Street / Potter Street / New Street / Church Street / Pottery Road / Baldwin Street – A large number of properties, essential services and highways are predicted at low/medium risk of surface water flooding throughout much of the east of the ward. The Fire Service recorded 13 incidents of pumping flood water from property and the highway. The area is largely drained by the combined sewer network, which discharges into an interceptor tunnel and so avoids tide lock. The drainage network is prone to blockage and siltation due to the typical shallow gradients. Liaison with DCWW is proposed to better understand the performance of the drainage network, a review of silt management and ongoing monitoring. The following measures are identified to reduce flood risk. Table 48 – Local Flood Risk Management measures for Pillgwenlly
Location and Measure Timescale Indicative Strategic Description Cost Context M1 Usk Way / Investigate highway Short term 4days FTE M24, M35 Docks Way drainage and reen (0-5 years) plus £2k maintenance and survey operation M2 Monitoring Ongoing N/A M53, M44 (Revenue) M3 Commercial Review of silt Short term 6days FTE M24, M35 Road management (0-5 years) plus £5k survey M4 Liaison with DCWW Ongoing N/A M53, M44 (Revenue) M5 Monitoring Ongoing N/A M53, M44 (Revenue) Total (non-revenue) 10days FTE and £7k
Recovery and review Preventing 3 2 3 2 Preparing Protecting
| Issue | 14 December 2015 Page 120 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.16 Ringland Ward
7.16.1 Overview Ringland Ward is situated in the central part of NCC, to the east of Central Newport. It has a population of 8,47834 and an area of 2.44km2, which is approximately 1.12% of the total area of Newport48. The ward is relatively flat, slightly sloping north to south, and contains a high concentration of residential properties. There are no Main Rivers in Ringland.
7.16.2 Ordinary watercourses and surface water flood risk The available data indicates some areas of high risk flooding from ordinary watercourses in the south of the ward. Higher risk flooding problems may also occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There is one reported instance of historical flooding from ordinary watercourses in Ringland which is detailed in the table below.
Location of Historic Flooding Reason Llanwern Road Ordinary watercourses blockage or natural flood The surface water flood maps show three main clusters of issues spread throughout the ward; near Ringland Way roundabout in the south, by Handel Close in the east and Howe Circle in the north. There are larger patches of high risk flooding in the vicinity of Handel Close and Ringland Way, with Howe Circle in the north being a lower risk. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. Historic flood information details one instance of flooding due to surface water in Ringland which is detailed in the table below. This reported flood incident relates to surface water flooding, it may relate to where the drainage systems cannot cope with high intensity rainfall or to blocked gullies or drains.
Location of Historic Flooding Reason Anson Green Surface water flooding The table below summarises the impacts of flooding in Ringland based on the Surface Water Flood map, shown below.
48 Ringland Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 121 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 49 – Flood Risk Map counts for Ringland
Risk Counts Medium Low High Totals in (1 in 30 to (1 in 100 to (>1 in 30 Risk to People and Property Defined Area 1 in 100 1 in 1000 chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 8837 70 202 872 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 3809 20 43 182 Residential Properties Essential Services 29 0 0 1 Risk to Economic Activity Non-Residential Properties in areas at risk of 24 0 1 4 flooding depth >0.2m Primary/Trunk Roads (km) 38.9 3.9 7.6 17.2 Mail Line Railways (km) 0.00 0.00 0.00 0.00 Agricultural Land - Grades 1, 2 and 3 (ha) 243 1 2 5 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 0.00 0.00 0.00 0.00 (ha) Sites of Interest for Nature Conservation 13.15 1.06 2.23 2.88 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 10.49 0.01 0.07 0.49 Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 Listed Buildings (n) 0 0 0 0 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 122 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 123 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.16.3 Groundwater There are no recorded groundwater flood incidents.
7.16.4 Sewer Flooding There are 9 reported instances of DG5 sewer flooding in this ward.
7.16.5 Measures to reduce local flood risk The main flood risks are identified as follows: Ringland Way – A large number of properties are predicted at low/medium risk of surface water flooding and the highway (A48) at high risk. The issue is linked to the adjacent upstream Ringland Circle/Stanford Road (see Section 7.4.5, Alway Ward). No historic incidents of surface water flooding are recorded. The area is drained by a partially culverted ordinary watercourse which discharges into Liswerry Pill Reen and the Drainage District. The adjacent Hartridge Farm surface water lagoon is over 3ha in size and anecdotal comments suggest maintenance is required to reduce upstream flood risk. The area, also known as Ringland Way Marsh, is designated as an SINC however there is thought to be extensive invasive species present and limited amenity value with no formalised public access. Investigation to optimise the management of the site and monitoring is proposed. Playford Crescent – A large number of properties and the highway are predicted at medium/high risk of surface water flooding. No historic incidents of surface water flooding are recorded. Further investigation into the culvert inlets and monitoring is proposed. Cunningham Road / Anson Green – A number of properties are predicted at medium risk of surface water flooding. The highway is predicted at high risk of surface water ponding. A surface water flooding incident is recorded at Anson Green and immediately downstream at Llanwern Road due to blockage or exceedance of the ordinary watercourse. The area is served by a partially- culverted ordinary watercourse. Some property sewer flooding is recorded but the area is understood to be served by a separate foul and storm sewer network. Further investigation into the culvert capacity and the four inlet grids is planned, with ongoing monitoring. Upstream woodland may present opportunities for attenuation storage to hold back peak flows. Bishpool Avenue – A small number of properties are predicted at medium/low risk of surface water along the alignment of an historic watercourse. No historic flooding incidents are recorded. The area is drained by a partially culverted watercourse. Investigation in to the culvert inlet grids and ongoing monitoring is proposed. Opportunities to attenuate flows will be explored in the ‘North of Ringland Circle’ open space, linked to Ringland Circle/Stanford Road downstream (see Section 7.4.5, Alway Ward).
| Issue | 14 December 2015 Page 124 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Coldra – The A229 / A48 / M4 roundabout is predicted at high risk of surface water flooding. Flows from the upstream Coldra Wood are culverted – links to Blossom Close (see Section 7.10.5, Langstone Ward). Monitoring is proposed. The following measures are identified to reduce flood risk. Table 50 – Local Flood Risk Management measures for Ringland
Location and Measure Timescale Indicative Strategic Description Cost Context N1 Ringland Way Investigate downstream Short term 3days FTE M24 lagoon maintenance/ (0-5 years) operation responsibilities. N2 Lagoon enhancements Short term £10-40k M33, M34 (0-5 years) nominal estimate N3 Monitoring Ongoing N/A M53, M44 (Revenue) N4 Playford Culvert inlet Short term 3 days FTE M24 Crescent investigation (0-5 years) and £2k survey N5 Monitoring Ongoing N/A M53, M44 (Revenue) N6 Cunningham Culvert inlet (4xgrids) Short term 5 days FTE M24 Road / Anson investigation (0-5 years) and £5k Green survey N7 Monitoring Ongoing N/A M53, M44 (Revenue) N8 Bishpool Culvert inlet Short term 3 days FTE M24 Avenue investigation (0-5 years) and £2k survey N9 Investigation into Short term 5days FTE M24, M31 upstream attenuation (0-5 years) and catchment restoration N10 Monitoring Ongoing N/A M53, M44 (Revenue) N11 Coldra Monitoring Ongoing N/A M53, M44 (Revenue) Total (non-revenue) 19days FTE and £19-49k
Recovery and review Preventing 5 5 5 3 Preparing Protecting
| Issue | 14 December 2015 Page 125 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.17 Rogerstone Ward
7.17.1 Overview Rogerstone Ward is situated along the northern border of NCC, to the north-west of Central Newport. It has a population of 10,11534 and an area of 8.66km2, which is approximately 4.0% of the total area of Newport49. The ward steeply slopes down to the valley floor which consists of predominantly residential properties, with some areas of commercial uses. The landuse of the hillslope is livestock and arable farmland. The Main River Ebbw borders the west of the ward.
7.17.2 Ordinary watercourses and surface water flood risk The available data indicates that limited areas of low risk flooding from ordinary watercourses. Problems may occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There is one reported instance of historical flooding from ordinary watercourses in Rogerstone which is detailed in the table below.
Location of Historic Flooding Reason The Uplands, Rogerstone Surface water flooding from natural exceedence or ordinary watercourse There are three main clusters of surface water flooding in Rogerstone in the west of the ward at Rogerstone Station/Oak Tree Drive, Wern Industrial Estate and near Myrtle Drive/Pye Corner. Although generally low risk there are areas of medium/high risk in these areas. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. Historic flood information details two instances of flooding due to surface water in Rogerstone which is detailed in the table below. This reported flood incident relates to surface water flooding, it may also relate to where the drainage systems cannot cope with high intensity rainfall or to blocked gullies or drains.
Location of Historic Flooding Reason The Uplands, Rogerstone Surface Water Flooding (Flash Flood)/culvert flooding Pye Corner, Rogerstone Surface Water Flooding/culvert flooding The table below summarises the impacts of flooding in Rogerstone based on the Surface Water Flood map, shown below.
49 Rogerstone Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 126 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 51 – Flood Risk Map counts for Rogerstone
Risk Counts Medium Low Totals in High (1 in 30 to (1 in 100 to Defined (>1 in 30 Risk to People and Property 1 in 100 1 in 1000 Area chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 10066 16 118 810 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 4339 5 18 131 Residential Properties Essential Services 50 0 0 2 Risk to Economic Activity Non-Residential Properties in areas at risk of 76 5 12 56 flooding depth >0.2m Primary/Trunk Roads (km) 61.5 3.2 7.7 20.7 Mail Line Railways (km) 3.59 0.23 0.52 1.56 Agricultural Land - Grades 1, 2 and 3 (ha) 865 11 17 34 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 0.00 0.00 0.00 0.00 (ha) Sites of Interest for Nature Conservation 130.23 8.03 11.37 15.84 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 136.23 1.60 2.36 5.37 Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 3.79 0.23 0.44 0.97 Listed Buildings (n) 13 0 1 3 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 127 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 128 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.17.3 Groundwater There are no recorded groundwater flood incidents.
7.17.4 Sewer Flooding There are 7 reported instances of DG5 sewer flooding in this ward.
7.17.5 Measures to reduce local flood risk The main flood risks are identified as follows: The Uplands / Wern Industrial Estate – A medium/high risk of surface water flooding is predicted to the highways and a number of services/industrial areas. There are historic surface water flooding incidents recorded with some property flooding. Maintenance by NCC in 2013 cleared silt, debris and roots in the surface water culvert. The sewer network in this area is understood to be a mix of combined and separate. There are anecdotal comments that the surface water network manhole benching is in a poor condition and increases the risk of blockages. A scheme is proposed to address this issue. Further investigation into culvert/surface water drainage capacity and monitoring is planned, along with liaison with DCWW on surface water disconnection opportunities. Myrtle Drive – A large number of properties are predicted at low/medium risk of surface water flooding. The sewer network in this area is generally separate. No surface flooding incidents are recorded. The area is served by a culvert running under the A467 highway embankment and discharging to the Ebbw River. Further investigation into the inlet arrangement and monitoring is recommended. Rogerstone Station/Oak Tree Drive – there are some areas of predicted surface water ponding. The sewer network in this area is generally separate, further investigation into the drainage arrangement and monitoring is recommended.
| Issue | 14 December 2015 Page 129 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The following measures are identified to reduce flood risk. Table 52 – Local Flood Risk Management measures for Rogerstone
Location and Measure Timescale Indicative Strategic Description Cost Context O1 Uplands/Wern Improve flow Short term £10-15k M33 Industrial Estate conveyance by re- (0-5 years) benching manhole O2 Investigation into Short term 3days FTE M24 storm drainage (0-5 years) plus £2k capacity survey O3 Monitor Ongoing N/A M53, M44 (Revenue) O4 Myrtle Drive/Pye Investigate drainage Short term 2days FTE M24 Corner arrangement (0-5 years) plus £2k survey O5 Monitor Ongoing N/A M53, M44 (Revenue) O6 Rogerstone Investigation into Short term 3days FTE M24 Station/Oak Tree drainage (0-5 years) plus £2k Drive arrangement survey 07 Monitor Ongoing N/A M53, M44 (Revenue) Total (non-revenue) 8days FTE plus £16-21k
Recovery and review Preventing 3 3 3 1 Preparing Protecting
| Issue | 14 December 2015 Page 130 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.18 Shaftesbury Ward
7.18.1 Overview Shaftesbury Ward is situated in the central part of NCC, to the immediate north of Central Newport. It has a population of 5,15934 and an area of 1.76km2, which is approximately 0.8% of the total area of Newport50. Shaftesbury is a relatively flat ward with a gentle slope from north to south, while bordering the River Usk to the east. The ward consists of industrial, residential and commercial buildings.
7.18.2 Ordinary watercourses and surface water flood risk The available data indicates that limited areas of low risk flooding associated with ordinary watercourses. Problems may occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There is one reported instance of historical flooding from ordinary watercourses in Shaftesbury which is detailed in the table below.
Location of Historic Flooding Reason Goodrich Crescent and Intense rainfall during October 2000 causing surrounding areas ordinary watercourse flooding There is one main area of surface water flooding in Shaftesbury in the central west of the ward near Malpas Road and Malpas Lane. Although generally low risk there are areas of medium/high risk which could affect properties. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. Historic flood information details one instance of flooding due to surface water in Shaftesbury which is detailed in the table below. This reported flood incident relates to surface water flooding where the drainage systems cannot cope with high intensity rainfall. The reported flood incidents may also relate to blocked gullies or drains.
Location of Historic Flooding Reason Bryn Bevan, Shaftesbury Surface Water Flooding (Flash Flood) The table below summarises the impacts of flooding in Shaftesbury based on the Surface Water Flood map, shown below.
50 Shaftesbury Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 131 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 53 – Flood Risk Map counts for Shaftesbury
Risk Counts Medium Low Totals in High (1 in 30 to (1 in 100 to Defined (>1 in 30 Risk to People and Property 1 in 100 1 in 1000 Area chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 5710 26 88 677 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 2461 7 22 196 Residential Properties Essential Services 28 0 0 3 Risk to Economic Activity Non-Residential Properties in areas at risk of 129 2 2 41 flooding depth >0.2m Primary/Trunk Roads (km) 29.7 1.3 3.5 10.1 Mail Line Railways (km) 0.01 0.00 0.00 0.00 Agricultural Land - Grades 1, 2 and 3 (ha) 163 0 0 0 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 10.67 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 10.80 0.00 0.00 0.00 (ha) Sites of Interest for Nature Conservation 13.43 0.27 0.40 0.63 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 3.60 0.00 0.00 0.04 Registered Parks and Gardens (ha) 7.43 0.01 0.02 0.08 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 Listed Buildings (n) 6 1 1 2 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 132 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 133 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.18.3 Groundwater There are no recorded groundwater flood incidents.
7.18.4 Sewer Flooding There are 5 reported instances of DG5 sewer flooding in this ward.
7.18.5 Measures to reduce local flood risk The main flood risks are identified as follows: Kimberly Terrace / Malpas Road – A number of properties are predicted at medium risk of surface water. There are anecdotal comments of historic property flooding and the Fire Service attended an incident to pump out floodwater in this area. The sewer system is understood to be a separate foul storm system upstream of the M4 but is understood to drain into a combined system to the south. NCC consider the Malpas M4 Roundabout surface water pumping station as ‘high risk’ and have telemetry installed. Some sewer property flooding is recorded. Liaison with DCWW is recommended to investigate surface water disconnection opportunities. Investigation into the culvert inlet arrangement and maintenance responsibilities are also proposed, with ongoing monitoring. Llanover Close / Malpas Road - A small number of properties are predicted at medium risk of surface water. Surface water flooding of property gardens is recorded in Llanover Close. The area is immediately downstream of Graig Park Road (See Section 7.13.5, Malpas Ward) and drained by a culvert to Malpas Brook. Further investigation into the culvert inlet arrangement is proposed, with ongoing monitoring. Pant Road - A number of properties are predicted at low/medium risk of surface water. No historic surface water property flooding is recorded however there are anecdotal comments of garden flooding. Investigation into the ownership and maintenance of a culvert is planned. The area is drained by a combined network and some sewer property flooding is recorded. Liaison with DCWW is recommended to investigate surface water disconnection opportunities. Bryn Bevan – A small cluster of properties is predicted at medium risk of surface water flooding. Historic surface water flooding of a property is recorded. The area is understood to be drained by a separate foul and storm sewerage network and investigation into localised improvements to the highway drainage in the topographic depression are proposed with ongoing monitoring. Agincourt Street / Argyle Street – Properties are predicted at medium risk of flooding. Whilst no historic surface water property flooding is recorded, the Fire Service have attended to pump flooding of the highway. The area comprises a mixture of residential and industrial properties and is adjacent to Crindau Pill. Investigation into the surface water drainage system
| Issue | 14 December 2015 Page 134 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
arrangement is proposed, including the condition of tidal outfalls. NRW are currently implementing a main river flood risk management scheme and opportunities for surface water flood risk betterment through partnership working will be proposed with ongoing monitoring. Hoskins Street / Wheeler Street – A number of properties are predicted at low/medium risk of surface water flooding. Whilst no historic surface water property flooding is recorded, the Fire Service have attended to pump a flooded property. As above, investigation into the surface water drainage system is proposed, seeking opportunities for surface water flood risk betterment through partnership working with NRW and ongoing monitoring. Old Green North – The surface water pumping station has been closed. Investigation and subsequent decommissioning is proposed should it be redundant. Goodrich Crescent – A small number of properties are predicted at low risk of surface water flooding. Historic flooding is recorded, attributed to main river sources. Property sewer flooding in the area is also recorded. Ongoing monitoring is planned. Harlequin Drive – A number of properties are predicted at low/medium risk of surface water flooding however no historic flooding is recorded. Ongoing monitoring is planned with investigation of the upstream culvert inlet arrangement and maintenance. There may be enhancement opportunities linked to the upstream Barrack Hill SINC. The following measures are identified to reduce flood risk.
| Issue | 14 December 2015 Page 135 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 54 – Local Flood Risk Management measures for Shaftesbury
Location and Measure Timescale Indicative Strategic Description Cost Context P1 Kimberly Liaison with DCWW on Ongoing N/A M24, Terrace / surface water disconnection (Revenue) M35 Malpas Road opportunities P2 Liaison with riparian owners Short term 2days FTE M24, regarding (0-5years) M43 maintenance/operation responsibilities. P3 Monitor Ongoing N/A M53, (Revenue) M44 P4 Llanover Investigation into culvert Short term 3days FTE M24 Close / inlet arrangement (0-5years) plus £2k Malpas Road survey P5 Monitor Ongoing N/A M53, (Revenue) M44 P6 Pant Road Liaison with DCWW on Ongoing N/A M24, surface water disconnection (Revenue) M35 opportunities P7 Monitor Ongoing N/A M53, (Revenue) M44 P8 Bryn Bevan Investigation into localised Short term 1day FTE M24 highway drainage (0-5years) improvements P9 localised highway drainage Short term £5-10k M33 improvements (0-5years) P10 Monitor Ongoing N/A M53, (Revenue) M44 P11 Agincourt Investigation into surface Short term 3days FTE M24 Street / water drainage condition (0-5years) plus £2k Argyle Street survey P12 Partnership working with Ongoing N/A M35 NRW on surface water (Revenue) betterment P13 Monitor Ongoing N/A M53, (Revenue) M44 P14 Hoskins Street Investigation into surface Short term 2days FTE M24 / Wheeler water drainage condition (0-5years) plus £2k Street survey P15 Partnership working with Ongoing N/A M35 NRW on surface water (Revenue) betterment P16 Monitor Ongoing N/A M53, (Revenue) M44 P17 Old Green Investigation into Short term 2days FTE M24 North decommissioning (0-5years) P18 Goodrich Monitor Ongoing N/A M53, Crescent (Revenue) M44 Total (non-revenue) 13days FTE plus £11- 16k
Recovery and review Preventing 6 7 7 5 Preparing Protecting
| Issue | 14 December 2015 Page 136 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.19 St Julians Ward
7.19.1 Overview St. Julians Ward is situated in the central part of NCC, to the immediate north-east of Central Newport. It has a population of 8,71434 and an area of 2.18km2, which is approximately 1.0% of the total area of Newport51. St Julians borders the River Usk to the west and north. The ward gently slopes down, from east to west, and is heavily concentrated with mainly residential, and a few industrial developments.
7.19.2 Ordinary watercourses and surface water flood risk The available data indicates that limited areas of low risk flooding associated with ordinary watercourses. Problems may occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There is one reported instance of historical flooding from ordinary watercourses in St Julians which is detailed in the table below:
Location of Historic Flooding Reason Orchard Street Surface water flooding caused by Lotteries Reen overflowing, natural exceedence of ordinary watercourses There are two main clusters of surface water flooding in St Julians, one in the central area of the ward around of the ward around Rockfield Street, and the other area to the north on the M4. There are areas of medium/high risk within these areas which could affect properties or the major road network. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. Historic flood information details three instances of flooding due to surface water in St Julians which is detailed in the table below. These reported flood incidents relates to surface water flooding where the drainage systems cannot cope with high intensity rainfall. The reported flood incidents may also relate to blocked gullies or drains.
Location of Historic Flooding Reason Caerleon Road, St Julians Surface Water Flooding (Flash Flood) Orchard Street, St Julians Surface Water Flooding (Flash Flood)/culvert flooding Bank Street Surface water flooding caused by hydraulic overload The table below summarises the impacts of flooding in St Julians based on the Surface Water Flood map, shown below.
51 St. Julians Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 137 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 55 – Flood Risk Map counts for St Julians
Risk Counts Medium Low Totals in High (1 in 30 to (1 in 100 to Defined (>1 in 30 Risk to People and Property 1 in 100 1 in 1000 Area chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 8793 58 181 1179 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 3790 11 62 357 Residential Properties Essential Services 29 0 0 2 Risk to Economic Activity Non-Residential Properties in areas at risk of 177 0 2 53 flooding depth >0.2m Primary/Trunk Roads (km) 31.7 1.6 4.2 10.2 Mail Line Railways (km) 2.70 0.01 0.03 0.11 Agricultural Land - Grades 1, 2 and 3 (ha) 195 0 0 0 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 28.77 0.00 0.00 0.01 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 28.83 0.00 0.00 0.01 (ha) Sites of Interest for Nature Conservation 38.22 0.03 0.14 1.31 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 0.00 0.00 0.00 0.00 Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 Listed Buildings (n) 2 0 0 0 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 138 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 139 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.19.3 Groundwater There are no recorded groundwater flood incidents.
7.19.4 Sewer Flooding There are 16 reported instances of DG5 sewer flooding in this ward.
7.19.5 Measures to reduce local flood risk The main flood risks are identified as follows: Stafford Road / Orchard Street / Bank Street / Margaret Avenue – A large number of properties are predicted at high/medium risk of surface water flooding. Historic surface water flooding of properties is recorded in Orchard Street, Bank Street and Caerleon Road. The Fire Service recorded incidents pumping out flooded highway and property. Some sewer property flooding is recorded in the area. The sewer network is combined and so there are potential opportunities for surface water disconnection through liaison with DCWW. Investigation into the arrangement, condition and capacity of the surface water partially-culverted watercourse and inlet grids which drains the area, running through open space to the rear of St Anne’s Crescent and discharging under the railway to the River Usk is proposed. Upstream opportunities for attenuation storage to hold back peak flows will be explored. Anecdotal comments suggest the downstream Lotteries Reen has maintenance and siltation issues. Ongoing monitoring is also proposed. Clippers Close – Surface water flooding is predicted to the highway. To the rear of properties, a culverted watercourse is shown to be the site of ponding. The Fire Service record minor flooding incident. Investigation of the capacity, ownership and maintenance of the culvert is proposed, noting access is restricted, with ongoing monitoring. M4 Junction 25 – Surface water flooding is predicted to the highway. Liaison with SWTRA is proposed to ensure their maintenance and resilience planning considers the residual risk should existing drainage fail, with ongoing monitoring.
| Issue | 14 December 2015 Page 140 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The following measures are identified to reduce flood risk. Table 56 – Local Flood Risk Management measures for St Julians
Location and Measure Timescale Indicative Strategic Description Cost Context Q1 Stafford Investigate drainage Short term 15days FTE M24, M34 Road/Orchard arrangement, (0-5years) and £5k Street / Bank Street maintenance survey / Margaret Avenue responsibilities and capacity Q2 Investigate culvert Short term 3days FTE M24, M34 inlet screen and (0-5years) and £3k capacity at Lotteries survey Reen Q3 Liaison with DCWW Short term N/A M24, M34 on surface water (0-5years) (revenue) disconnection opportunities Q4 Monitor Ongoing N/A M53, M44 (revenue) Q5 Clippers Close Investigation of Short term 4days FTE M24, M34 culvert capacity, (0-5years) and £3k ownership and surveys maintenance. Q6 Monitor Ongoing N/A M53, M44 (revenue) Q9 M4 Junction 25 Liaison with SWTRA 1day FTE M35 Q10 Monitor Ongoing N/A M53, M44 (revenue) Total (non-revenue) 23days FTE plus £11k
Recovery and review Preventing 3 4 3 5 Preparing Protecting
| Issue | 14 December 2015 Page 141 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.20 Stow Hill Ward
7.20.1 Overview Stow Hill Ward is situated in the central part of NCC, covering a central area of Central Newport. It has a population of 4,90334 and an area of 1.38km2, which is approximately 0.6% of the total area of Newport52. Stow Hill has a small area of raised elevation in the centre of the ward. The ward borders the River Usk to the east, and mainly consists of residential, commercial and industrial developments.
7.20.2 Ordinary watercourses and surface water flood risk The available data indicates that there are minimal areas of low risk flooding associated with ordinary watercourses. Problems may occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There is one reported instance of historical flooding from ordinary watercourses in Stow Hill which is detailed in the table below
Location of Historic Flooding Reason Newport City Centre Intense rainstorm during July 1997 caused extensive surface water flooding in and around Newport centre. Natural exceedence and flash flood There is one main area of surface water flooding in Stow Hill in the north of the ward near Cambrian Road. This area shows mainly medium and high risk with some properties and roads affected. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. A number of surface water pumping stations operate to reduce the risk of surface water flooding, and flooding due to tide-lock. Historic flood information details one instance of flooding due to surface water in Stow Hill which is detailed in the table below. This reported flood incident relates to a storm pumping station issue. There may be other areas of flooding where the drainage systems cannot cope with high intensity rainfall, or due to blocked gullies or drains.
Location of Historic Flooding Reason Kingsway, under Old Green, Storm pumping station issue Stow Hill The table below summarises the impacts of flooding in Stow Hill based on the Surface Water Flood map, shown below.
52 Stow Hill Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 142 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 57 – Flood Risk Map counts for Stow Hill
Risk Counts Medium Low Totals in High (1 in 30 to (1 in 100 to Defined (>1 in 30 Risk to People and Property 1 in 100 1 in 1000 Area chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 5596 28 121 422 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 2412 6 27 84 Residential Properties Essential Services 99 2 4 10 Risk to Economic Activity Non-Residential Properties in areas at risk of 503 40 113 184 flooding depth >0.2m Primary/Trunk Roads (km) 29.9 1.1 2.8 8.5 Mail Line Railways (km) 3.39 0.50 0.84 1.36 Agricultural Land - Grades 1, 2 and 3 (ha) 131 0 0 0 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 7.09 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 7.07 0.00 0.00 0.00 (ha) Sites of Interest for Nature Conservation 0.00 0.00 0.00 0.00 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 0.00 0.00 0.00 0.00 Registered Parks and Gardens (ha) 9.86 0.03 0.10 0.39 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.10 0.00 0.00 0.01 Listed Buildings (n) 107 1 3 10 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 143 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 144 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.20.3 Groundwater There are no recorded groundwater flood incidents.
7.20.4 Sewer Flooding There are 10 reported instances of DG5 sewer flooding in this ward.
7.20.5 Measures to reduce local flood risk The main flood risks are identified as follows: Queensway / High Street / Cambrian Road / Skinner Street– A number of properties and highways are predicted at high/medium risk of surface water flooding in this area. Some property sewer flooding is recorded locally and the highway is understood to drain to the combined sewer. Surface water flooding is recorded during an intense rainstorm. The Fire Service have recorded incidents in the area pumping surface water from the highway and properties. Investigation into the drainage arrangement and capacity is ongoing and linked to the redevelopment downstream, with liaison with DCWW to identify any surface water disconnection opportunities and monitoring proposed. Kingsway / Usk Road – The highway underpass (A4042) is predicted at high risk of surface water flooding. Surface water flooding incidents are recorded occasionally, linked to operational issues with the Old Green South storm pumping station. NCC identify the Old Green South storm pumping station as ‘high risk’ and telemetry is installed. Refurbishment is ongoing as part of the redevelopment of the area. It is likely that enhanced highway drainage maintenance will be recommended. Ongoing monitoring is proposed. Gaer Street / Cardiff Road – A number of properties and the highway are predicted at high/medium risk of surface water flooding. No flooding incidents are recorded. Anecdotal comments suggest that the carriageway drainage arrangement of a private estate should be reviewed to reduce the risk of highway ponding. Ongoing monitoring is proposed. Friars Field – Surface water flooding is predicted adjacent to the hospital. Although no surface water flooding is recorded by NCC, the Fire Service have recorded an incident of pumping flooded highways. Investigation into the drainage arrangement, capacity and exceedance pathways is proposed with ongoing monitoring. Cardiff Road / Kingsway – A small number of properties and the highway are predicted at risk of surface water flooding. The issue is linked and considered as part of Commercial Road, Pillgwenlly (see Section 7.15.2).
| Issue | 14 December 2015 Page 145 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The following measures are identified to reduce flood risk. Table 58 – Local Flood Risk Management measures for Stow Hill
Location and Measure Timescale Indicative Strategic Description Cost Context R1 Queensway / High Investigation into Ongoing 10days FTE M24 Street / Cambrian drainage arrangement and £8k Road / Skinner including connection survey Street to combined sewer. R2 Liaison with DCWW Short term N/A M24, M35 on surface water (0-5years) (revenue) disconnection opportunities R3 Monitoring Ongoing N/A M53, M44 (revenue) R4 Kingsway Surface water Ongoing N/A M24, M35 pumping station (developer) refurbishment R5 Monitoring Ongoing N/A M53, M44 (revenue) R6 Gaer Street / Review private Short term 3days FTE M24, M35 Cardiff Road highway drainage (0-5years) and £2k arrangement survey R7 Monitoring Ongoing N/A M53, M44 (revenue) R8 Friars Field Investigation into Short term 10days FTE M24, M35 drainage arrangement, (0-5years) and £2k capacity and survey exceedance pathways. R9 Enhanced highway Short term N/A M35 drainage maintenance (0-5years) (revenue) R10 Monitoring Ongoing N/A M53, M44 (revenue) Total (non-revenue) 23days FTE & £12k
Recovery and review Preventing 3 5 4 5 Preparing Protecting
| Issue | 14 December 2015 Page 146 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.21 Tredegar Park Ward
7.21.1 Overview Tredegar Park Ward is situated in the central part of NCC, to the south-west of Central Newport. It has a population of 4,44634 and an area of 1.79km2, which is approximately 0.8% of the total area of Newport53. Tredegar Park Ward is relatively flat. It is comprised of residential properties, with several open green spaces, and an industrial park to the south-west. The Main River Ebbw borders it in the north and the Main River Pontygwew Reen flows through the north and east of the ward. Much of the ward is within the Wentlooge Level drainage district.
7.21.2 Ordinary watercourses and surface water flood risk The available data indicates that there are also some areas of low risk flooding associated with ordinary watercourses. Problems may occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There are no reported instances of historical flooding from ordinary watercourses in Tredegar Park. There are three clusters of issues related to surface water flooding in Tredegar Park however they are generally low risk with small areas of medium and high risk. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. A number of surface water pumping stations operate to reduce the risk of surface water flooding, and flooding due to tide-lock. There are no reported instances of flooding due to surface water in Tredegar Park.
53 Tredegar Park Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 147 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The table below summarises the impacts of flooding in Tredegar Park based on the Surface Water Flood map, shown below. Table 59 – Flood Risk Map counts for Tredegar Park
Risk Counts Medium Low Totals in High (1 in 30 to (1 in 100 to Defined (>1 in 30 Risk to People and Property 1 in 100 1 in 1000 Area chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 4487 0 0 724 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 1934 0 0 148 Residential Properties Essential Services 12 0 0 0 Risk to Economic Activity Non-Residential Properties in areas at risk of 9 1 2 13 flooding depth >0.2m Primary/Trunk Roads (km) 21.5 0.3 1.4 9.0 Mail Line Railways (km) 1.21 0.00 0.00 0.01 Agricultural Land - Grades 1, 2 and 3 (ha) 180 0 2 17 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) (ha) 24.34 0.01 0.19 1.06 Sites of Interest for Nature Conservation 2.48 1.09 1.33 1.60 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 0.00 0.00 0.00 0.00 Registered Parks and Gardens (ha) 0.01 0.00 0.00 0.00 Country Parks (ha) 0.90 0.00 0.01 0.12 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 Listed Buildings (n) 0 0 0 0 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 148 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 149 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.21.3 Groundwater There are no recorded groundwater flood incidents.
7.21.4 Sewer Flooding There is one reported instance of DG5 sewer flooding in this ward.
7.21.5 Measures to reduce local flood risk The main flood risks are identified as follows: Woodside Estate – a number of properties are predicted at low risk of surface water flooding however no surface water flooding has been recorded. Anecdotal comments suggest that there have been issues with fly tipping on Tredegar Reen causing partial blockages. Liaison with the adjacent school and community is proposed to explore opportunities for supportive local monitoring and enhancement of the adjacent open space of centre of Duffryn Estate, with ongoing monitoring by NCC. The issue is linked to the upstream Jamaica Close / Dyffryn Drive / Woodside Estate issue (see Section 7.14.5, Marshfield Ward) Viscount Evan Drive / Beech Grove – a number of properties and the carriageway are predicted at low risk of surface water flooding however no surface water flooding has been recorded. Anecdotal comments suggest highway gullies blockages may have exacerbated localised ponding and a review of maintenance is planned. The area is drained by the Pontygwew Reen and largely within the drainage district. Liaison with NRW and monitoring is also proposed. Morgan Way – a small number of properties and the carriageway are predicted at low risk of surface water flooding however no surface water flooding has been recorded. Monitoring is proposed.
| Issue | 14 December 2015 Page 150 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The following measures are identified to reduce flood risk. Table 60 – Local Flood Risk Management measures for Tredegar Park
Location and Measure Timescale Indicative Strategic Description Cost Context S1 Woodside Investigate and establish Short term 3days FTE M43, Estate local flood action group to (0-5) and £5k M44 monitor & assist with (public debris clearance. meeting) S2 Investigate enhancements Short term 10days FTE M43, to public open space (0-5) M44 adjacent to Reen, providing additional attennuation S3 Monitor Ongoing N/A M53 S4 Viscount Evan Review highway drainage Ongoing N/A M35 Drive / Beech maintenance. (Revenue) S5 Grove Partnership working with Ongoing N/A M35 NRW wrt Reen (Revenue) S6 Monitor Ongoing N/A M53, M44 S7 Morgan Way Monitor Ongoing N/A M53 Total (non-revenue) 3days FTE and £5k
Recovery and review Preventing 3 0 5 2 Preparing Protecting
| Issue | 14 December 2015 Page 151 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.22 Victoria Ward
7.22.1 Overview Victoria Ward is situated in the central part of NCC, covering an area of Central Newport to the south-east. It has a population of 7,44734 and an area of 1.03km2, which is approximately 0.5% of the total area of Newport54. Victoria Ward is bordered by the River Usk to the west. The ward is relatively flat and contains a mix of residential, commercial and industrial developments.
7.22.2 Ordinary watercourses and surface water flood risk The available data indicates that there are no areas at risk flooding associated with ordinary watercourses. However, problems may occur in isolated locations, for example due to culvert restrictions. As many of the ordinary watercourses are culverted where they pass through developed areas it is difficult to distinguish between surface water flooding and flooding from ordinary watercourses. There are no reported instances of historical flooding from ordinary watercourses in Victoria Ward. There is one cluster of surface water flooding in Victoria in the centre of the ward around Chepstow Road area. This area is generally low risk with patches of medium and high risk potentially affecting properties and the road network. The surface water flood maps take a generalised approach to the representation of drainage systems however the mapping is indicative of areas most affected during high intensity storms or due to blockages. There are no reported instances of flooding due to surface water in Victoria. The table below summarises the impacts of flooding in Victoria based on the Surface Water Flood map, shown below.
54 Victoria Ward Profile (2014) Newport city council
| Issue | 14 December 2015 Page 152 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Table 61 – Flood Risk Map counts for Victoria
Risk Counts Medium Low Totals in High (1 in 30 to (1 in 100 to Defined (>1 in 30 Risk to People and Property 1 in 100 1 in 1000 Area chance in chance in chance in any year) any year) any year) Estimated residents in areas at risk of flooding depth >0.0m 7280 21 81 2928 Estimated People (multiplier 2.32, Newport average household size 2010) Residential Properties at risk of internal flooding depth >0.2m 3138 2 23 1075 Residential Properties Essential Services 40 0 0 4 Risk to Economic Activity Non-Residential Properties in areas at risk of 193 3 7 75 flooding depth >0.2m Primary/Trunk Roads (km) 18.6 0.6 3.0 11.1 Mail Line Railways (km) 1.05 0.02 0.05 0.06 Agricultural Land - Grades 1, 2 and 3 (ha) 94 0 0 0 Risk to Natural and Historic Environment Special Areas of Conservation (SAC) (ha) 9.33 0.00 0.00 0.00 Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 Ramsar Sites (ha) 0.00 0.00 0.00 0.00 Sites of Special Scientific Interest (SSSI) 9.33 0.00 0.00 0.00 (ha) Sites of Interest for Nature Conservation 0.00 0.00 0.00 0.00 (SINC) (ha) National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00 Ancient Woodland (ha) 0.00 0.00 0.00 0.00 Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00 Country Parks (ha) 0.00 0.00 0.00 0.00 Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 Listed Buildings (n) 19 0 0 0 Essential Settings of Regional Planning 0.00 0.00 0.00 0.00 Guidance (ha) RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
| Issue | 14 December 2015 Page 153 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
| Issue | 14 December 2015 Page 154 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
7.22.3 Groundwater There are no recorded groundwater flood incidents.
7.22.4 Sewer Flooding There is one reported instance of DG5 sewer flooding in this ward.
7.22.5 Measures to reduce local flood risk The main flood risks are identified as follows: Bristol Street / Manchester Street / Exeter Street / Livingstone Place / Hereford Street / London Street / Prince Street - A number of properties, services, local streets and the B4591 highway are predicted at low/medium risk of surface water flooding. However no historic surface water flooding has been recorded and the area is relatively flat and understood to be drained by the combined sewer network. Sewer flooding is recorded on the periphery of the area and opportunities for surface water surface attenuation storage to hold back peak flows should be investigated. Liaison with DCWW is planned with ongoing monitoring. Marlborough Road / Methuen Road / Jeffrey Street – As above, a number of properties and local streets are predicted at low/medium risk of surface water flooding. No historic surface water flooding has been recorded by NCC. However the Fire Service records attendance to pump flooded highways locally and local media report the Rodney Parade stadium was flooded by heavy rain in 2011. As above, the area is relatively flat and understood to be drained by the combined sewer network and opportunities for surface water surface attenuation should be investigated. Liaison with DCWW is planned with ongoing monitoring. Opportunities for betterment associated with redevelopment should continue to be explored. Lennard Street / Halstead Street / Gordon Street / Phillip Street / Witham Street / Feering Street / Vivian Road – A large number of properties and streets are predicted at low risk of surface water flooding, with the B4237 highway railway underpass at high risk. No surface water or sewer flooding is recorded. As above, the area is relatively flat and understood to be drained by the combined sewer network and opportunities for surface water surface attenuation storage to hold back peak flows should be investigated. Liaison with DCWW is planned with ongoing monitoring. This is linked to the adjacent Walsall Street / Dudley Street issue (see Section 7.11.5, Liswerry)
| Issue | 14 December 2015 Page 155 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
The following measures are identified to reduce flood risk. Table 62 – Local Flood Risk Management measures for Victoria
Location and Measure Timescale Indicative Strategic Description Cost Context T1 Bristol Street / Liaison with Short term 10days M24, Manchester Street / DCWW on surface (0-5 years) FTE M35 Exeter Street / water disconnection Livingstone Place / opportunities T2 Hereford Street / London Monitor Ongoing N/A M53, Street / Prince Street (Revenue) M44 T3 Marlborough Road / Liaison with Short term 10days M24, Methuen Road / Jeffrey DCWW on surface (0-5 years) FTE M35 Street water disconnection opportunities T4 Monitor Ongoing N/A M53, (Revenue) M44 T5 Lennard Street / Halstead Liaison with Short term 10days M24, Street / Gordon Street / DCWW on surface (0-5 years) FTE M35 Phillip Street / Witham water disconnection Street / Feering Street / opportunities T6 Vivian Road Monitor Ongoing N/A M53, (Revenue) M44 Total (non-revenue) 30days FTE
Recovery and review Preventing 3 3 3 3 Preparing Protecting
| Issue | 14 December 2015 Page 156 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
8 Implementation and Delivery
8.1 Summary of Measures Table 63 – Summary of local flood risk management proposed measures across NCC
Total (non-revenue) days Total (non-revenue) Ward (FTE) (£k) Borough-wide 15 £430k Allt-yr-Yn 2 £170-360k Alway 15 £30-57k Beechwood 13 £25-45k Bettws 21 £71-212k Caerleon 25 £70-170k Gaer 20 £20-33k Graig 25 £6k Langstone 15 £60-210k Liswerry 23 £14-24k Llanwern 3 £32-52k Malpas 7 £23-28k Marshfield 19 £18k Pillgwenlly 10 £7k Ringland 19 £19-49k Rogerstone 8 £16-21k Shaftesbury 13 £11-16k St. Julians 23 £11k Stow Hill 23 £12k Tredegar Park 3 £5k Victoria 30 Totals 332 £1,050-1,766k
8.2 Implementation Programme The programme for delivering the management of local flood risk over the 2015 to 2021 period will be dictated by the specific measures required for undertaking such management and availability of resources/funding. The detailed programme of implementation of the specific measures which will be developed in the future when the measures have been investigated and prioritised.
| Issue | 14 December 2015 Page 157 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
8.3 Measure justification Prioritisation of measures (see Section 4.2) will focus on those issues with a higher risk or chance of flooding, and those issues impacting on residential properties. The standard of service that measures will meet will be determined on their individual justification, following a risk-based approach to flood risk management. As a comparison, new residential developments are designed no property flooding for a 1 in 100 year with allowance for climate change and sewers are designed for no site flooding in a 1 in 30 annual chance rainfall event. The approach to justification will be tailored to the identified funder(s) requirements. For each measure, the benefits (be they tangible or intangible), the associated costs and the means by which the measures will be funded will need to be proportionately determined. Details for measures that are not locational specific such as implementation of awareness campaigns and the provision of guidance and advice to local communities, business and individuals will be defined.
8.4 Funding for Local Flood Risk Management Flood risk management activities in the Borough have primarily been historically funded through government grants. However moving forwards, a partnership approach will be required. Implementing the measures will depend on securing sufficient funding. Implementing the proposed measures will depend on securing sufficient funding. Failure to receive additional funding could result in measures identified not being implemented in part or full, or delayed. There are local, national and European Union potential funding sources, some summarised below. These sources could provide either partial funding, match funding or full funding, and depends upon the nature of the individual scheme.
8.4.1 Public funding Welsh Government allocates the following grant funding for flood and coastal erosion risk management in Wales: Environment & Sustainable Development Grant – Revenue funding to undertake the requirements of the FWMA. Typically NCC uses this grant to pay for additional staff resources, maintain the assets register, complete flood investigations and capacity building. This is not available for capital schemes. FCERM – (Flood and Coastal Risk Management) Grant in Aid. NCC has no schemes programmed however is to be replaced by the FIFP and FaCIP. FIFP – (Flood and Coastal Erosion Innovative Finance Programme) (programme of up to £150 million capital investment in local authority coastal flooding and erosion risk management schemes. The programme is about managing and reducing risks from coastal flooding and erosion and schemes.
| Issue | 14 December 2015 Page 158 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
There is also an expectation on the achievement of wider benefits – community, social, economic, environmental and social. FIFP Schemes will: be financed through borrowing, using the Local Government Borrowing Initiative or Welsh Government’s direct borrowing powers – options are being considered. be co-financed, Welsh Government contribution 75% Local Authorities 25%. be identified and business cases developed from 2015 onwards. be expected to start construction in the period 2018-21. FaCIP – (Flood and Coast Investment Programme) – Welsh Government recently consulted55 on this proposed method of funding to which NCC responded. This consultation considered the way that Welsh Government allocates funding for flood and coastal erosion risk management in Wales and ensuring it focuses on those places with the greatest risk. The intention is to create a clear, objective way of directing funds to places at risk from all sources of flooding and coastal erosion. NCC (like other authorities) is currently awaiting for further guidance from Welsh Government on this funding mechanism. NCC fund culvert inlet grid cleansing works and highway drainage maintenance under their standard ‘revenue’ works through the task being completed by NCC’s direct labour organisation. This is not available for capital schemes. Glastir is the Welsh Government’s five-year sustainable land management scheme and is funded by the Rural Development Programme 2014-2020. Financial support is offered farmers and land managers for the delivery of environmental outcomes including improved water management to improve water quality and reduce flood risk, and contributing towards a reversal in the decline of Wales’ native biodiversity. The Welsh Government offers financial support to eligible landowners directly to fund capital work targeted at specific locations which are best placed to deliver the environmental aims of Glastir Advanced. NCC will continue to liaise with NRW and DCWW to identify what, if any, flood risk management schemes are being implemented by these Risk Management Authorities, and whether there is an opportunity to work jointly and share the costs associated with any of the proposed measures. Local authorities, such as NCC, have the power to borrow money to fund capital projects through prudential borrowing56.
55 Flood and Coast Investment Programme (FaCIP). Available from: http://gov.wales/consultations/environmentandcountryside/flood-and-coast-investment- programme-facip/?lang=en Accessed: 20/08/15. 56 Capital Finance – Welsh Local Government Association. Available from: http://www.wlga.gov.uk/capital-finance Accessed: 20/08/15.
| Issue | 14 December 2015 Page 159 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
European Union funding is also available from the European Regional Development Fund (ERDF) where flood schemes can contribute to wider programme objectives. Newport is within the East Wales operational programme.
8.4.2 Private Funding DCWW invests in flood schemes as part of their duty to remove properties form the DG5 register (DG5 is a level of service indicator which examines a water company’s performance in respect of internal sewer flooding of properties). Sometimes the most effective way to do this is to work in partnership with risk management authorities on flood schemes in other areas, which can help reduce surface water pressure downstream. In particular, DCWW have developed the RainScape57 initiative to focus on managing the amount of surface water entering their sewers. Section 106 of the Town and Country Planning Act 1990 allows planning obligations to be sought for site-specific mitigations and/or contributions. These should make the development acceptable in planning terms by enhancing the quality of the development and providing community benefits or infrastructure facilities. Planning obligation contributions cannot be pooled from five or more developments to provide infrastructure which could be funded through CIL. Community Infrastructure Levy (CIL) – is a new charging mechanism for securing contributions from developers and is intended to supplement other public sector revenue streams, to ensure that new community infrastructure can be provided to keep pace with population grow. It focuses on the provision of new infrastructure, not remedying pre-existing deficiencies in infrastructure unless those deficiencies will be made more severe by new development. The levy can be used to increase the capacity of existing infrastructure or to repair failing existing infrastructure, if that is necessary to support development.
NCC recently consulted58 on CIL charging schedule. Importantly the draft Regulation 123 list states:
Drainage: The Flood & Water Management Act 2010 requires the use of Sustainable Drainage Systems (SUDS) for surface water drainage in all new housing and business development. In future, the design of surface water drainage will need to be consented by a new Sustainable Drainage Approval Body, prior to development commencing. However, provision has been made in the Act for details of these schemes to be submitted, via the local planning authority, as part of the planning application process. Surface water drainage is an integral part of new development schemes and, as such, direct provision by the developer is required.
57 DCWW Rainscape Introduction. Available at: http://www.dwrcymru.com/en/My- Wastewater/RainScape.aspx Accessed on 26/08/15. 58 NCC Planning – Consultations Community Infrastructure Levy – Preliminary Draft Charging Schedule Stage. Available at: http://www.newport.gov.uk/en/Planning- Housing/Planning/Consultations/Consultations.aspx Accessed on 26/08/15.
| Issue | 14 December 2015 Page 160 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Where off-site drainage works are required, which are necessary as a consequence of a new development schemes, these should continue to be funded by s.106 Obligations. Work to the strategic drainage network will not be funded by CIL.
Flooding: A significant amount of urban development in the Authority has taken place alongside rivers, within the river corridor, and often on the Flood Risk Zone. It is inevitable that some existing development will be vulnerable to flooding. Where sites are located in the Flood Risk Zone, suitable mitigation and resilience measures have been agreed with Natural Resources Wales. Any such measures will be undertaken as an integral part of individual development schemes and any off- site works will be provided directly via in- kind contributions, or through s106 obligations. As such, work to flood defences will not be funded by CIL. Private and/or community beneficiary contributions - another important funding mechanism may come in the form of local fundraising from local communities and businesses that stand to benefit from the proposed flood schemes.
8.5 Environmental Influences on Measures
8.5.1 Water Framework Directive Specific measures, particularly structural measures, associated with managing local flood risk and coastal erosion will have to comply with the requirements of the WFD (See Section 2.3.5). As part of the on-going liaison between NCC and Natural Resources Wales, once specific measures are designed, these will be communicated to NRW for advice. Opportunities to assist the delivery of the WFD objectives will be sought.
8.5.2 Strategic Environmental Assessment Directive The LFRMS Strategic Environmental Assessment (SEA) Scoping Report set out the framework for undertaking further assessments as and when specific measures – and the strategy itself – are developed further during subsequent stages. Following on from the Scoping Report, an SEA Report of the LFRMS was prepared and the conclusions were generally positive. Aligning with the National Strategy and relevant guidance, there was a clear consideration to integrate environmental issues and opportunities into the objectives of the LFRMS. Many of the proposed measures have the potential for direct and indirect environmental benefits. However, the LFRMS SEA made a number of recommendations to avoid, reduce or otherwise mitigate the potential for negative effects, and ensure the potential for positive opportunities were considered. The recommendations were that the LFRMS should: Consider flood risk management options that work with natural processes and provide multiple benefit, for example by working in synergy with the WFD or environmental enhancement initiatives;
| Issue | 14 December 2015 Page 161 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Be clear that the processes for developing the next stages of flood risk and coastal erosion planning, appraisals, implementation and construction of measures will address the potential for environmental effects; Use the results of the SEA as an initial guide to the above processes.
NCC will rely on the SEA work completed as part of the LFRMS to meet the ‘SEA’ Regulations. In all cases the exact scope of works required for individual measures is unknown at this stage and further investigation is planned. The ‘SEA’ Regulations require NCC to monitor the significant environmental effects of the implementation of the plan – with the aim of identifying unforeseen adverse effects at an early stage and to allow appropriate remedial action to be taken.
8.5.3 Habitats Regulations Assessment The Habitats Directive offers protection to natural habitat and wild flora and fauna. The requirements of the Habitats Directive are implemented in Wales by the Conservation of Habitats and Species Regulations 2010, often referred to as the Habitats Regulations. The sites that are afforded protection under this regulation are referred to as Special Areas of Conservation (SAC) and Special Protection Areas (SPA) in the UK. As a matter of policy, the Welsh Government and the UK Government have also chosen to apply the same level of protection to Ramsar sites. Under the regulations, competent authorities are required to undertake appropriate assessments where a plan or a project is likely to have an impact on a protected (SAC, SPA and Ramsar) site. Such assessment is referred to as a Habitats Regulations Assessment (HRA). There are many protected sites in Newport covering a variety of habitats59. Specific measures may be subject to a Habitats Regulations Assessment. The need for such an assessment will depend upon the type of measure proposed to be implemented. For instance, a non-structural measure which involves raising flood risk awareness by holding community engagement exercises will not be subject to this assessment. However, a structural measure which involves constructing a flood scheme will be subject to this assessment. The assessment, if required, will be undertaken in the following four stages. Stage 1 – Screening - assesses the likely impact of the project, either alone or in combination with other plans and projects, on a protected site. The screening process also assesses the significance of the likely impacts. Stage 2 – Appropriate Assessment - considers the impact of the proposed project on the integrity of the protected site in relation to its conservation objectives and its functions. If any adverse impact is identified, then mitigation measures need to be considered. If the mitigation measures cannot avoid the adverse impact on the protected site, then consent for the project can only be granted provided that Stages 3 and 4 are followed.
59 International and National Protected Sites are listed. Available at: http://www.newport.gov.uk/en/Leisure-Tourism/Countryside--Parks/Biodiversity/Protected- sites.aspx Accessed 4/10/15
| Issue | 14 December 2015 Page 162 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Stage 3 – Assessment of Alternative Solutions - determines if it is possible to achieve the objectives of the proposed project by considering alternative solutions which will have lesser impact on the protected site. Stage 4 – Imperative Reasons for Over-riding Public Interest (IROPI) - If the adverse impacts associated with the proposed project cannot be mitigated, then a Stage 4 assessment is undertaken. If this assessment concludes that the proposed project should proceed, then compensatory measures, which maintain the overall coherence of the site, will need to be secured. The national government will need to be consulted prior to the implementation of the project. In addition, the Secretary of State for Communities and the local government will need to inform the EC about the compensatory measures secured as part of the process. If the Habitats Regulation Assessment concludes that a certain specific measure will impact on a protected site, then in addition to a full Habitats Assessment, an Environmental Assessment will also be undertaken. Given the requirement to demonstrate wider environmental benefits, measures that have significant adverse environmental impacts are unlikely to be viewed positively by the public, the Risk Management Authorities and the Welsh Government who will need to approve the plan. However, if a particular measure demonstrates greater benefits for the local community and local businesses, then it may be possible to justify the adverse environmental impact.
| Issue | 14 December 2015 Page 163 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
9 Public Consultation
Successful management of flood risk relies on having a two way dialogue with those affected by flooding and at potential risk of flooding. It is important to enhance their understanding of the risk and increase awareness. At the same time it is important to understand what is important to them so that measures can be implemented which prioritise the needs of the community. The LFRMS preparation included two phases of consultation. An initial public consultation was undertaken by NCC during November-December 2012 to understand the views of the residents, businesses and other organisations in Newport on local flood risk, and help shape the strategy. The LFRMS was drafted following the initial consultation, and was subjected to a public consultation during January and February 2013. In addition, NRW, the then Caldicot and Wentlooge Levels IDB, DCWW and the Welsh Government were also invited to comment on the draft.
9.1 Consultation on the Draft Local Flood Risk Management Plan The draft FRMP will be published in advance of a four-week consultation period between December 2015 and January 2016, and hosted on the NCC website. The consultation will include: Key partners and elected representatives (see Section 4.3) Residents and businesses in Newport. A questionnaire will be prepared by NCC and made available to enable residents and businesses in Newport to provide feedback and comment on the draft FRMP. Provisions will be made to allow the responses to be received online via the NCC website and on paper copies posted to NCC offices. NCC will support this by raising awareness of the consultation using their media channels. The following questions will be used as prompts: Question 1 - Do you agree this draft plan sets out the most important issues with surface water, ordinary watercourses and groundwater flood risk for your area? If not, please explain what is missing. Question 2 - What do you consider to be the highest priorities for managing the risk of flooding in Newport? Question 3 - This draft plan proposes measures to manage flood risk through prevention, preparation, protection and recovery/review. Is the balance between these different types of proposed approaches in the draft plan right? If not, which proposed measures would you change, and why? Question 4 – Do you agree with the proposed Borough-wide measures (See Section 7.2)? Are there other proposed measures that should be included?
| Issue | 14 December 2015 Page 164 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
Question 5 – Are there other proposed local ward measures that should be included (See Section 7.3 to Section 7.22)? If yes, please explain what they are and why they should be included. Question 6 - How can you support the work set out in the draft flood risk management plan to reduce flood risk? Question 7 – Do you have any further comments? Once complete, we will collate the comments received (personal information will be removed), explain how we have taken them into account and what changes will be made before the FRMP is finalised. NCC will seek Cabinet approval for the final FRMP, prior to submission to Welsh Government in February 2016.
9.2 Further Consultation Additional public consultation(s) will be undertaken when specific measures for mitigating local flood risk are developed during subsequent stages. These are likely to be held within the communities where such specific measures are proposed to be implemented. As part of their LFMRS, NCC will also undertake appropriate exercises to increase flood risk awareness across Newport and provide further guidance and information on managing such risk and minimising damage.
| Issue | 14 December 2015 Page 165 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
10 Monitoring and review
The National Strategy will be formally reviewed on a six-yearly cycle, mirroring the requirements of the Flood Risk Regulations 2009. This will enable the Welsh Government to consider the information being produced from the mapping and planning exercises that the NRW and LLFA complete. This information will also inform LFRMSs and NCC will review their LFRMS every 6 years, the first being in 2017 to coincide with the formal review of the National FCERM Strategy. The measures and delivery programme will be reviewed annually, with a full review completed by December 2021. Subsequent reviews will be carried out at 6 year intervals. The adhoc addition of measures will be considered, if the need for emergency works is identified.
References
National strategy for flood and coastal erosion risk management Newport City Council Preliminary Flood Risk Assessment Newport City Council Local Flood Risk Management Strategy
Appendices
| Issue | 14 December 2015 Page 166 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Appendix A Historic Local Flood Events
Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
A1 Preliminary Flood Risk Assessment Historic Flooding
Annex 1 of the Newport Preliminary Flood Risk Assessment is reproduced below.
| Issue | 14 December 2015 Page A1 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Annex 1 Past floods
Records of past floods and their significant consequences (preliminary assessment report spreadsheet) Flood ID Summary description Name of Location National Grid Location Description Start date Days duration Probability Main source of flooding Additional source(s) Confidence in main Main mechanism of Main characteristic of Significant Human health Property count method Significant economic Number of non- Significant Significant Data owner Flood event outline Reference of flooding source of flooding flooding flooding consequences to consequences - consequences residential properties consequences to the consequences to confidence human health residential properties flooded environment cultural heritage Mandatory Mandatory Mandatory Mandatory Optional Optional for first cycle Optional for first cycle Optional for first cycle Optional for first cycle Optional Optional Optional for first cycle Optional for first cycle Mandatory Optional Optional Mandatory Optional Mandatory Mandatory Optional Optional Unique number Max 5,000 characters Max 250 characters 12 characters: 2 Max 250 characters 'yyyy' or 'yyyy-mm' or Number with two Max 25 characters Pick from drop-down Max 250 characters, Pick from drop-down Pick from drop-down Pick from drop-down Pick from drop-down Number between 1- Pick from drop-down Pick from drop-down Number between 1- Pick from drop-down Pick from drop-down Max 250 characters Pick from drop-down between 1-9999 letters, 10 numbers 'yyyy-mm-dd' decimal places same source terms 10,000,000 10,000,000 A sequential number Description of the flood and its adverse or potentially adverse consequences. Where Name of the locality National Grid A description of the The date when the The number of days The chance of the Pick the source from If flooding occurred Pick a broad level of Pick a mechanism Pick a characteristic Were there any Record the number of Where residential or Were there any Record the number of Were there any Were there any Choose from; 'High' starting at 1 and available, information from other fields (Start date , Days duration , Probability , Main source , associated with the Reference of the general location that flood commenced - (duration) of the flood - flood occuring in any which the majority of from, or interacted confidence in the Main from; 'Natural from; 'Flash flood' significant residential properties non-residential significant economic non-residential significant significant (data includes one of: incrementing by 1 for Main mechanism , Main characteristics , Significant consequences ) should be repeated here. flood, using recognised centroid (centre point, was flooded. when land not normally that land not normally given year - record X flooding occurred. with, any other sources source of flooding exceedance' (of (rises and falls quite consequences to where the building properties have been consequences when properties where the consequences to the consequences to Aerial video, Aerial each record. postal address names falls within polygon) of covered by water covered by water was from "a 1 in X chance Refer to the PFRA (other than the Main from; 'High' capacity), 'Defence rapidly with little or no human health when the structure was affected counted, it is important the flood occurred, or building structure was environment when the cultural heritage when photos, Professional such as streets, towns, the flood extent, or of became covered by covered by water. of occurring in any guidance for definitions source of flooding ), (compelling evidence exceedance' advance warning), flood occurred, or either internally or to record the method of would there be if it affected either flood occurred, or the flood occurred, or survey, Flood level counties. If the flood the area affected if water. Values should be given year". Where this of sources. report the source(s) of source - about 80% (floodwater overtopping 'Natural flood' (due to would there be if it externally by the flood, counting, to aid were to re-occur? internally or externally would there be if it would there be if it information, EA flood affected the whole there is no extent within the range 0.01 - is difficult to estimate, here, using the same confident that source is defences), 'Failure' (of significant were to re-occur? or that would be so comparisons between by the flood, or that were to re-occur? were to re-occur? data recording staff LLFA, then record the information. 999.99 (permitting a range can be source terms. correct), 'Medium' natural or artificial precipitation, at a affected if the flood counts. Choose from; would be so affected if notes), 'Medium' (data name of the LLFA. records to the nearest recorded. (some evidence of defences or slower rate than a flash were to re-occur. 'Detailed GIS' (using the flood were to re- includes one of: EA/LA quarter of an hour, source but not infrastructure, or of flood), 'Snow melt property outlines, as occur. ground video, EA/LA where appropriate). compelling - about pumping), 'Blockage or flood' (due to rapid per Environment ground photos, EA/LA 50% confident that restriction' (natural or snow melt), 'Debris Agency guidance), flood event outline source is correct) 'Low' artificial blockage or flow' (conveying a high 'Simple GIS' (using map, LA/professional (source assumed - restriction of a degree of debris), or property points), partner officer site about 20% confident conveyance channel or 'No data'. Most UK 'Estimate from map', or records, Public ground that source is correct) system), or 'No data'. floods are 'Natural 'Observed number'. video), 'Low' (not or 'Unknown'. floods'. confident) or 'Unknown'.
1 Rainfall of 46mm recorded in Newport between 18:00 and 18:45 on 9/7/97 caused extensive Newport City Centre ST 3099888240 09/07/1997 0.5 160 Surface runoff High-Medium Natural exceedance Flash flood Yes Unknown No Unknown No No Newport City Council surface water flooding in and around the the centre of Newport. The Met Office considered and surrounding this a very rare event occurring once every 160 years. It was confined to a relatively small streets. area and associated with a thunderstorm.
2 between 28th-30th October 2000 100mm of rainfall had been measured in the Newport area. Goodrich Crescent ST 30592 89347 Goodrich Crescent and 30/10/2000 1 100-120 Main rivers High-Medium Defence exceedance Natural flood Yes 50-60 Observed number No No No Newport City Council High This led to flooding throughout the town and in partcular at Goodrich Crescent and Gaer surrounding area Vale.
3 Properties flooded at Forge Farm Lane due to a blocked trash screen Ford Farm Lane ST 38335 90181 approx. 2002 0.5 unknown Ordinary watercourses Medium Blockage or restriction Natural flood No 2 or 3 Observed number No No No Newport City Council High
4 Surface water flooding caused by blocked trash screen and collapsed pipe Springfield, Rhiwderin ST 25878 87512 No No No No Newport City Council High-Medium
5 Surface water flooding caused by hydraulic overload of combined sewer Orchard Street ST 31836 89406 No No No No Newport City Council High
6 Surface water flooding caused by hydraulic overload Bank Street ST 31963 89750 No No No No Newport City Council High
7 Surface water flooding caused by blocked trash screen Ringland Circle ST 34879 88026 Ringland Circle Ordinary watercourses Medium Blockage or restriction Natural flood No 28 Observed number No No No Newport City Council High-Medium
8 Surface water flooding Llanwern Road ST 35331 89121 Ordinary watercourses Medium Blockage or restriction Natural flood No 8 Observed number No No No Newport City Council High-Medium
9 Surface water flooding Anson Green ST 35322 89255 No 3 Observed number No No No Newport City Council High-Medium
10 Surface water flooding Roman Way ST 32910 91493 No No No No Newport City Council High-Medium
11 Surface water flooding St Cadocs Close ST 32910 91493 approx.1998 Ordinary watercourses Medium Natural exceedance Natural flood No 8 Observed number No No No Newport City Council High-Medium
12 Surface water flooding Bellin Close ST 33234 91537 Ordinary watercourses Medium Natural exceedance Natural flood No 4 Observed number No No No Newport City Council High
13 Surface water flooding caused by Lotteries Reen overflowing Orchard Street ST 31836 89406 Ordinary watercourses Medium Natural exceedance Natural flood No 16 Observed number No No No Newport City Council High-Medium
14 Surface water flooding caused by Tredegar Reen overflowing Woodside ST 29063 85406 Duffryn Ordinary watercourses Medium Natural exceedance Natural flood No 10 (Elderly persons Estimate from map No No No Newport City Council High complex)
15 Surface water flooding Ffos-y-Fran ST 26797 86988 Bassaleg Ordinary watercourses Medium Natural exceedance Natural flood No 4 Estimate from map No No No Newport City Council High
16 Surface water flooding caused by Monks Ditch overflowing Station Road ST 36560 87808 Llanwern Main rivers Ordinary watercourses Medium Natural exceedance Natural flood No Observed number No No No Newport City Council High
17 Surface water flooding St Albans Cottage, St ST 25858 81993 Marshfield Ordinary watercourses Medium Natural exceedance Natural flood No 1 Observed number No No No Newport City Council High Mellons Road
18 Surface Water flooding The Uplands, ST 26661 88829 Rogerstone Ordinary watercourses Medium Natural exceedance Natural flood No 3 Observed number No No No Newport City Council High Rogerstone Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
A2 Recent Historic Flooding
Supplementary records from NewportCC of local flooding incidents that have occurred since preparation of the PFRA (April 2011) is recorded below.
| Issue | 14 December 2015 Page A2 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX
Recent Past floods
Records of past floods and their significant consequences (preliminary assessment report spreadsheet) Flood ID Summary description Name of Location National Grid Location Description Start date Days duration Probability Main source of Additional source(s) Confidence in main Main mechanism of Main characteristic of Significant Human health Property count method Significant Number of non- Property count method Other economic Environment Data owner Flood event outline Reference flooding of flooding source of flooding flooding flooding consequences to consequences - economic residential properties consequences consequences confidence human health residential properties consequences flooded Mandatory Mandatory Mandatory Mandatory Optional Optional for first cycle Optional for first cycle Optional for first cycle Optional for first cycle Optional Optional Optional for first cycle Optional for first cycle Mandatory Optional Optional Mandatory Optional Optional Optional Optional Optional Optional
1 Surface Water Flooding (Flash Flood)/WW sewer flooding; 8 Residential Larch Grove, Malpas 22/05/2014 Surface runoff DCWW sewer High-Medium No data 8 Observed number No 2 Surface Water Flooding (Flash Flood); 3 Residential Almond Drive, Malpas 22/05/2014 Surface runoffflooding High-Medium No data 3 Observed number No 3 Llanover Close, 22/05/2014 Surface runoff High-Medium No data 2 Observed number No 2 Gardens Surface Water Flooding (Flash Flood); 2 Residential (2 gardens) Malpas 4 Surface Water Flooding (Flash Flood)/culvert flooding; 2 Residential Wavell Drive, Malpas 22/05/2014 Surface runoff Culvert flooding High-Medium No data 2 Observed number No 5 Old Malpas Road, 22/05/2014 Surface runoff DCWW sewer High-Medium No data 2 Observed number No Surface Water Flooding (Flash Flood)/WW sewer flooding; 2 Residential Malpas flooding 6 Bryn Bevan, 22/05/2014 Surface runoff DCWW sewer High-Medium No data 1 Observed number No Surface Water Flooding (Flash Flood)/WW sewer flooding; 1 Residential Shaftesbury flooding 7 Surface Water Flooding (Flash Flood)/private sewer flooding; 1 Residential Meon Close, Bettws 22/05/2014 Surface runoff Private sewer flooding High-Medium No data 1 Observed number No 8 The Uplands, 22/05/2014 Surface runoff Culvert flooding High-Medium No data 2 Observed number No Surface Water Flooding (Flash Flood)/culvert flooding; 2 Residential Rogerstone 9 Nantymor Cottages, 22/05/2014 Surface runoff High-Medium No data 1 Observed number No Surface Water Flooding (Flash Flood); 1 Residential Coedkernew 10 Church Crescent, 22/05/2014 Surface runoff Sewer flooding High-Medium No data 1 Observed number No Surface Water Flooding (Flash Flood)/sewer flooding; 1 Residential Bassaleg 11 Ashwell Cottages, 22/05/2014 Surface runoff High-Medium No data 1 Observed number No Surface Water Flooding (Flash Flood); 1 Residential Caerleon 12 Caerleon Road, St 22/05/2014 Surface runoff DCWW sewer High-Medium No data 2 Observed number No 1 Garden Surface Water Flooding (Flash Flood)/WW sewer flooding; 2 Residential (1 Julianshouse, 1 garden) flooding 13 Orchard Street, St 22/05/2014 Surface runoff Culvert flooding High-Medium No data 1 Observed number No 2 Observed number Surface Water Flooding (Flash Flood)/culvert flooding; 1 Residential, 2 CommercialJulians 14 Christchurch Road, 22/05/2014 Surface runoff High-Medium No data 2 Observed number No Surface Water Flooding (Flash Flood); 2 Residential Beechwood 15 Heather Road, 22/05/2014 Surface runoff High-Medium No data 1 Observed number No Surface Water Flooding (Flash Flood); 1 Residential Beechwood 16 Woodland Road, 22/05/2014 Surface runoff High-Medium No data 1 Observed number No Surface Water Flooding (Flash Flood); 1 Residential Beechwood 17 A48 Chepstow Rd, Recurring Surface runoff Culvert flooding High-Medium No data 1 Observed number No 1 Observed number Surface Water Flooding/culvert flooding; 1 Residential, 1 Commercial Langstone 18 Bishton Rd, between Recurring Surface runoff Culvert flooding High-Medium No data Highway Waltwood Rd and Surface Water Flooding/culvert flooding; Highway Bishton 19 Magor Road, nr j/w Recurring Surface runoff Culvert flooding High-Medium No data Highway Surface Water Flooding/culvert flooding; Highway Waltwood Rd 20 Llanthewy Rd j/w Rarely now Surface runoff Culvert flooding High-Medium No data Highway Surface Water Flooding/culvert flooding; Highway Bryngwyn Rd 21 Station Road, Rarely now Surface runoff Culvert flooding High-Medium No data Unknown Surface Water Flooding/culvert flooding; Residential Llanwern Village 22 Lanstone Lane, Recurring Surface runoff Culvert flooding High-Medium No data Highway Surface Water Flooding/culvert flooding; Highway Lanwern Village 23 Pye Corner, Recurring Surface runoff Culvert flooding High-Medium No data Unknown Garden Surface Water Flooding/culvert flooding; Residential (garden) Rogerstone 24 Stephenson St, under Occassionally Surface runoff DCWW sewer High-Medium No data Highway Welsh Water sewer issue; Highway Rail Bridge, Liswerry flooding 25 Docks Way, under Occassionally Surface runoff Storm pumping station High-Medium No data Highway Storm pumping station issue; Highway Rail Bridge, Maesglas 26 Kingsway, under Old Occassionally Surface runoff Storm pumping station High-Medium No data Highway Storm pumping station issue; Highway Green, Stow Hill 27 Storm Water system issue; Cemetery St Woolos Cemetery Unknown Surface runoff High-Medium No data Cemetery Cemetery Newport City Council Newport Local Flood Risk Management Flood Risk Management Plan
A3 Additional Flooding Incidents
Records from South Wales Fire and Rescue of flooding incidents during the period June 2009 and June 2015 have been used to supplement incident information. A total of 119 incidents occurred during this period.
| Issue | 14 December 2015 Page A3 J:\244000\244494-00\4 INTERNAL PROJECT DATA\4-50 REPORTS\NEWPORT FRMP DRAFT REPORT_ISSUE FOR CONSULTATION.DOCX