Strategic Environmental Assessment Environmental Report
Total Page:16
File Type:pdf, Size:1020Kb
Conwy Local Flood Risk Management Strategy Strategic Environmental Assessment – Environmental Report March 2013 Conwy County Borough Council ConwyECP Local ECP ECPFlood ECP RiskECP Document2 Management Strategy24 July 2012 Strategic Environmental Assessment – Environmental Report March 2013 Conwy County Borough Council G.B. Edwards BEng (Hons) CEng FICE Head of Environment, Roads & Facilities, Mochdre Offices, Conway Road, Mochdre, Colwyn Bay, LL29 5AB. Tel. (01492) 574000 Fax. (01492) 575199 Conwy Local Flood Risk Management Strategy Strategic Environmental Assessment – Environmental Report Issue and revision record Local Flood Risk Management Strategy, Strategic Environmental Assessment, Document Title Environmental Report Version 130326.TP11A.LFRMSER.02 Status Approved Document version Notes Date 0.2 Final Issue March 2013 Signature Name Date N Levy 14/02/13 Prepared by C Probert 14/02/13 S Wasik Checked by D Rowlands 14/02/13 Approved by G Edwards This document is issued for the party which commissioned it We accept no responsibility for the consequences of this and for specific purposes connected with the above-captioned document being relied upon by any other party, or being used project only. It should not be relied upon by any other party or for any other purpose, or containing any error or omission which used for any other purpose. is due to an error or omission in data supplied to us by other parties. This document contains confidential information and proprietary intellectual property. It should not be shown to other parties without consent from us and from the party which Copyright of Conwy County Borough Council commissioned it. Conwy Local Flood Risk Management Strategy Strategic Environmental Assessment – Environmental Report Content Chapter Title Page Abbreviations i Glossary iii Non-Technical Summary vi Local Flood Risk Management Strategy _____________________________________________________________ vi Strategic Environmental Assessment _______________________________________________________________ vi The likely effects of the LFRMS ___________________________________________________________________ vi Monitoring of the LFRMS ________________________________________________________________________ vi The next stage _______________________________________________________________________________ vii 1. Introduction 1 1.1 Introduction ________________________________________________________________________ 1 1.2 Purpose of the Assessment Stage and Environmental Report _________________________________ 1 1.3 Compliance with the SEA Directive ______________________________________________________ 2 1.4 Links with Wider Studies ______________________________________________________________ 2 1.5 Limitations of the SEA ________________________________________________________________ 4 2. SEA Process and Methodology 5 2.1 SEA Legislative Requirements and Purpose ______________________________________________ 5 2.2 SEA Process and Stages _____________________________________________________________ 5 2.3 SEA Scoping Consultation Results ______________________________________________________ 7 3. Description and Context of the Conwy Local Flood Risk Management Strategy 8 3.1 Conwy Local Flood Risk Management Strategy ____________________________________________ 8 3.2 Conwy LFRMS Objectives and Strategic Options ___________________________________________ 9 3.2.1 Introduction ________________________________________________________________________ 9 3.2.2 Strategy Outcomes __________________________________________________________________ 9 3.2.3 Strategy Options ___________________________________________________________________ 10 4. Stage A Scoping Summary 13 4.1 Plans and Programmes Summary _____________________________________________________ 13 4.2 Baseline Scoping Summary __________________________________________________________ 15 4.2.1 Future Baseline ____________________________________________________________________ 15 4.3 Key Environmental Issues and Opportunities _____________________________________________ 16 4.4 SEA Framework ___________________________________________________________________ 20 4.5 Compatibility of SEA Objectives _______________________________________________________ 24 5. Strategic Options Development and Assessment 26 5.1 Compatibility of LFRMS Outcomes and SEA Objectives ____________________________________ 26 5.2 Summary of Compatibility ____________________________________________________________ 26 5.3 Assessment of Strategic Options ______________________________________________________ 28 5.4 Summary of Options Assessment ______________________________________________________ 29 5.4.1 Initial Draft LFRMS Outcome 1 ________________________________________________________ 29 5.4.2 Initial Draft LFRMS Outcome 2 ________________________________________________________ 30 Conwy Local Flood Risk Management Strategy Strategic Environmental Assessment – Environmental Report 5.4.3 Initial Draft LFRMS Outcome 3 ________________________________________________________ 32 5.4.4 Initial Draft LFRMS Outcome 4 ________________________________________________________ 33 5.4.5 Initial Draft LFRMS Outcome 5 ________________________________________________________ 35 5.4.6 Initial Draft LFRMS Outcome 6 ________________________________________________________ 36 5.4.7 Initial Draft LFRMS Outcome 7 ________________________________________________________ 37 5.4.8 Initial Draft LFRMS Outcome 8 ________________________________________________________ 38 5.4.9 Initial Draft LFRMS Outcome 9 ________________________________________________________ 39 5.4.10 Initial Draft LFRMS Outcome 10 _______________________________________________________ 40 6. Conwy LFRMS Development and Assessment 42 6.1 Development of LFRMS _____________________________________________________________ 42 6.2 Assessment of Conwy LFRMS ________________________________________________________ 49 6.2.1 LFRMS Outcome 1 Assessment _______________________________________________________ 50 6.2.2 LFRMS Outcome 2 Assessment _______________________________________________________ 53 6.2.3 LFRMS Outcome 3 Assessment _______________________________________________________ 56 6.2.4 LFRMS Outcome 4 Assessment _______________________________________________________ 58 6.2.5 LFRMS Outcome 5 Assessment _______________________________________________________ 61 6.2.6 LFRMS Outcome 6 Assessment _______________________________________________________ 63 6.2.7 LFRMS Outcome 7 Assessment _______________________________________________________ 65 6.2.8 LFRMS Outcome 8 Assessment _______________________________________________________ 67 6.2.9 LFRMS Outcome 9 Assessment _______________________________________________________ 69 6.2.10 LFRMS Outcome 10 Assessment ______________________________________________________ 71 6.3 Cumulative Assessment _____________________________________________________________ 73 7. Mitigation and Monitoring 74 7.1 Mitigation and Enhancement Measures _________________________________________________ 74 7.2 Monitoring Proposals _______________________________________________________________ 74 7.3 Links to Other Tiers of Plans, Programmes and the Project Level _____________________________ 76 8. Conclusions of the SEA 77 8.1 Conclusions and Difference the SEA Process has made to the LFRMS ________________________ 77 8.2 Next Steps in the SEA Process ________________________________________________________ 77 8.2.1 Remaining Stages of the SEA Process __________________________________________________ 77 8.2.2 Stage D: Consulting on the draft Strategy and the Environmental Report _______________________ 77 8.2.3 Completion of Stage E ______________________________________________________________ 78 Appendices 79 Appendix A. Draft Environmental Report & Scoping Consultation Results _________________________________ 80 Appendix B. Plans and Programmes Review _______________________________________________________ 97 Appendix C. Baseline Information _______________________________________________________________ 140 C.1. Air Quality _______________________________________________________________________ 140 C.2. Water __________________________________________________________________________ 140 C.2.1. Main Rivers and Tributaries _________________________________________________________ 140 C.2.2. Major Lakes and Reservoirs _________________________________________________________ 141 C.2.3. Estuarine and Coastal Bodies ________________________________________________________ 142 C.2.4. Groundwater Bodies _______________________________________________________________ 143 C.2.5. Water Pollution Issues _____________________________________________________________ 143 C.2.6. Hydrogeology ____________________________________________________________________ 144 Conwy Local Flood Risk Management Strategy Strategic Environmental Assessment – Environmental Report C.2.7. Flooding ________________________________________________________________________ 145 C.2.7.1. Sources and Types of Flood Risk _____________________________________________________ 146 C.2.7.2. Historical Flood Records ____________________________________________________________ 147 C.3. Climatic Factors __________________________________________________________________ 148 C.4. Soils ___________________________________________________________________________ 148 C.4.1. Geology_________________________________________________________________________ 148 C.4.2.