MTCBC Flood Risk Management Plan June 2015 www.merthyr.gov.uk 0 MTCBC – Flood Risk Management Plan Title of Document: MTCBC Flood Risk Management Plan Document Date: June 2015 Author/s: M Williams, K Davies Service Responsible for this Neighbourhood Services document: Directorate: Customer Services Approved by: Draft not yet approved (E.g.Cabinet, Council, Board) Approved on: N/A Date for Review: N/A To be published on: 22 December 2015 Intranet/Website/Both Website Keywords for search purposes: Flood, Risk, Management, Strategy, Community, Plan Related Documents and Policies: Preliminary Flood Fisk Assessment (PFRA) Local Flood Risk Management Strategy (LFRMS) Special Environmental Assessment (SEA) Merthyr Tydfil County Borough Council Civic Centre, Castle Street Merthyr Tydfil, CF47 8AN Canolfan Ddinesig, Stryd y Castell, Merthyr Tudful, CF47 8AN Tel/Ffôn: 01685 725000 Fax/Ffacs: 01685 374397 e‐mail/e‐bost: [email protected] 1 MTCBC – Flood Risk Management Plan MERTHYR TYDFIL COUNTY BOROUGH COUNCIL (MTCBC) FLOOD RISK MANAGEMNT PLAN (FRMP) CONTENTS 1 Introduction by the Chief Executive .................................................................. 7 2 Purpose of Flood Risk Management Plans in Managing Flood Risk ............. 8 2.1 What is a Flood Risk Management Plan (FRMP) ................................................. 8 2.2 What is included in this FRMP .............................................................................. 8 2.3 Legislative Context ................................................................................................ 9 3 Study Area ......................................................................................................... 12 3.1 Administrative Area ............................................................................................. 12 3.2 Flood Risk in MTCBC.......................................................................................... 14 3.3 Preliminary Flood Risk Assessment .................................................................... 17 3.4 Conclusions drawn from the Flood Risk Maps at a Borough Wide Level ........... 21 3.5 Community areas most at risk from surface water flooding within MTCBC ........ 25 4 How we currently manage flood risk in MTCBC ............................................ 29 4.1 Procedures, Measures and Powers .................................................................... 29 4.2 How we prioritise our work .................................................................................. 31 4.3 Who we work with to manage flood risk in MTCBC ............................................ 31 4.4 How this FRMP has been co-ordinated .............................................................. 36 4.5 Measures already underway in MTCBC to manage flood risk ............................ 36 5 Co-ordination with the Severn River Basin Management Plan ..................... 39 5.1 General ............................................................................................................... 39 5.2 Severn River Basin Districts Overview ................................................................ 40 5.3 Summary of co-ordination of development and implementation of the FRMP with the River Basin Management Plan (RBMP) and the River Basin Flood Risk Management Plan (RBFRMP) for the River Severn. .......................................... 41 6 MTCBC Flood Risk Management Objectives .................................................. 44 6.1 Summary of Welsh Government National FCERM Strategy ............................... 44 6.2 MTCBC Objectives from Local Strategy ............................................................. 45 6.3 MTCBC Detailed Objectives ............................................................................... 46 6.4 Summary of the Process for the Selection and Prioritising Measures to Achieve Objectives ........................................................................................................... 47 7 How we will manage flood risk at a local level ............................................... 52 7.1 MTCBC – Flood Risk Area .................................................................................. 52 2 MTCBC – Flood Risk Management Plan 7.2 Abercanaid Community Area .............................................................................. 72 7.3 Aberfan Community Area .................................................................................... 79 7.4 Cefn Coed-y-cymmer Community Area .............................................................. 85 7.5 Dowlais Community Area .................................................................................... 91 7.6 Gellideg Community Area ................................................................................... 97 7.7 Heolgerrig Community Area .............................................................................. 103 7.8 Merthyr Tydfil (North) Community Area ............................................................ 109 7.9 Merthyr Tydfil (South) Community Area ............................................................ 115 7.10 Merthyr Vale Community Area .......................................................................... 121 7.11 Pentrebach Community Area ............................................................................ 127 7.12 Troedyrhiw Community Area ............................................................................. 133 8 MTCBC – Whole Borough (Community Areas outside the FRA) ................ 139 8.1 Overview ........................................................................................................... 139 8.2 Bedlinog Community Area ................................................................................ 141 8.3 Treharris Community Area ................................................................................ 147 8.4 Trelewis Area of Flood Risk .............................................................................. 153 8.5 Vaynor Community Area ................................................................................... 158 9 Public Consultation ........................................................................................ 163 9.1 MTCBC Flood Risk Partners ............................................................................. 163 9.2 Method of Consultation ..................................................................................... 163 9.3 Consultation and Engagement with Flood Risk Management Authorities (FRMAs) and the Public ................................................................................................... 164 10 Monitoring and Review ................................................................................... 170 APPENDICES ..................................................................................................................... 171 Appendix 1 - The Risk Management Authorities ......................................................... 172 Appendix 2 – Measures Contained within the LFRMS ................................................ 178 Appendix 3 – MTCBC FRMP Risk Counting methodology - overview ........................ 200 Appendix 4 – Glossary of Terms ................................................................................. 208 Appendix 5 – Components of the FRMP as detailed in the Flood Risk Regulations 2009 – Part 4 ............................................................................................................. 212 3 MTCBC – Flood Risk Management Plan List of Figures Figure 1: Flood Risk Regulations (2009) Timescale ............................................................... 9 Figure 2: Location of MTCBC within Wales .......................................................................... 12 Figure 3: MTCBC - Flood Risk Area and Blue Squares ........................................................ 20 Figure 4: MTCBC Community Areas .................................................................................... 28 Figure 5: WFD Management Catchments for Wales ............................................................ 39 Figure 6: Severn River Basin District Flood Risk Management Plan .................................... 40 Figure 7: MTCBC - Flood Risk Map – Risk to People ........................................................... 68 Figure 8: MTCBC - Flood Risk Map – Risk to Economic Activity .......................................... 69 Figure 9: MTCBC - Flood Risk Map – Risk to Natural and Historic Environment ................. 70 Figure 10: Abercanaid - Flood Risk Map .............................................................................. 78 Figure 11: Aberfan - Flood Risk Map .................................................................................... 84 Figure 12: Cefn Coed-y-cymmer - Flood Risk Map .............................................................. 90 Figure 13: Dowlais - Flood Risk Map .................................................................................... 96 Figure 14: Gellideg – Flood Risk Map ................................................................................. 102 Figure 15: Heolgerrig - Flood Risk Map .............................................................................. 108 Figure 16: Merthyr Tydfil (North) - Flood Risk Map ............................................................. 114 Figure 17: Merthyr Tydfil (South) - Flood Risk Map ............................................................ 120 Figure 18: