Authority National Water Resources Strategy
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Howard Humphreys Consulting Engineers in Association with Cobham Resource Consultants Natlono1 divers Authority Informc ~n Centre Heed C oe ClOiS N o _________________ Accession No ftiL Q Ja .__ n a tio n a l r iv er s— AUTHORITY NATIONAL WATER RESOURCES STRATEGY: COMPARATIVE ENVIRONMENTAL APPRAISAL OF STRATEGIC OPTIONS Volume 2: Appendices Ref. 84.247,0/AW/3122/NRAEAAPP.R02 Howard Humphreys & Partners Ltd Thomcroft Manor Dorking Road Leatherhead Surrey KT22 8JB January 1994 e&2> Brown & Root Civil Howard Humphreys Consulting Engineers in Association with Cobham Resource Consultants NATIONAL RIVERS AUTHORITY NATIONAL WATER RESOURCES STRATEGY: COMPARATIVE ENVIRONMENTAL APPRAISAL OF STRATEGIC OPTIONS Volume 2: Appendices Ref. 84.247.0/AW/3122/NRAEAAPP.R02 Howard Humphreys & Partners Ltd Thomcroft Manor Dorking Road Leatherhead Surrey KT22 8JB ♦ " January 1994 NATIONAL RIVERS AUTHORITY NATIONAL WATER RESOURCES STRATEGY COMPARATIVE ENVIRONMENTAL APPRAISAL OF STRATEGIC OPTIONS FINAL REPORT VOLUME 2 - APPENDICES CONTENTS TERMS OF REFERENCE LITERATURE REVIEW - THE AQUATIC IMPACTS OF INTER-BASIN TRANSFER AND RIVER REGULATION SCHEMES 1. International Perspective 2. Physio-Chemical Changes 2.1 Hydrology 2.2 Water Quality 2.3 Geomorphology 3. Biological Responses 3.1 Aquatic Ecology 3.2 Fisheries 4. Summary EXPERIENCE FROM EXISTING UK SCHEMES 1. Introduction 2. Evidence from NRA Regions 3- Impacts of Selected Existing UK Schemes 3.1 Ely Ouse to Essex Transfer 3.2 Kielder Regulation and Transfer 3*3 River Dee Regulation 3.4 River Tywi Regulation 3-5 West BerkshireGround water Scheme 3.6 Shropshire Groundwater Scheme 4. Summary 84.247.0/AW/3122/NRAEAAPF.R02 APPENDICES CONTENTS (Cont.) D. ENVIRONMENTAL ASSESSMENT OF OPTION COMPONENTS 1. EA Methodology 1.1 Categories and Criteria 1.2 General Character/Landscape 1.3 Water Quality 1.4 Fisheries 1.5 Aquatic Ecology 1.6 Agriculture 1.7 Archaeology and Cultural Heritage 1.8 Terrestrial Ecology Component Assessments E. BIBLIOGRAPHY F. SUMMARY SHEETS FOR UK SCHEMES G. BIOLOGICAL BANDING M.247.0/WP/3122/NRAEAAPF.CON NATIONAL RIVERS AUTHORITY NATIONAL WATER RESOURCES STRATEGY COMPARATIVE ENVIRONMENTAL APPRAISAL OF STRATEGIC OPTIONS FINAL REPORT VOLUME 1 - MAIN REPORT CONTENTS EXECUTIVE SUMMARY m 1. INTRODUCTION 1 1.1 Background 1 1.2 Objectives and Tasks 2 1.3 Scope of Study 2 1.4 limitations of Study 3 1.5 Scope of Report 3 2. IDENTIFICATION OF STRATEGIC OPTIONS 5 2.1 Selection of Strategic Options 5 2.2 Strategic Options 6 3. LITERATURE REVIEW AND UK EXPERIENCE 7 3.1 Key Findings from Literature Review 7 3.2 Key Findings From UK Experience 9 3.3 NRA Consultation Workshops 11 3.4 Key Issues 11 4. FRAMEWORK FOR ENVIRONMENTAL ASSESSMENT 17 4.1 Role of Environmental Assessment 17 4.2 Method of Environmental Assessment 20 4.3 Categories and Criteria 20 4.4 Assessment of Option Components . 21 4.5 Comparison of Options 22 5 ENVIRONMENTAL IMPLICATIONS OF STRATEGIC OPTIONS 23 5.1 OPTION 1: Unsupported Sevem-Thames Transfer 23 5.1.1 River Severn Downstream of Deerhurst 23 5.1.2 Bankside Storage and Pumping Station at - - - Deerhurst 27 5-1.3 Pipeline, Deerhurst to Down Ampney 28 5.1.4 Gravel Pit Storage at Down Ampney 29 R et 84.2 47.0/AW/ 3122/NRAEAAP P. R02 5.1.5 Restored Thames & Severn Canal 30 5.1.6 River Thames, Buscot to Egham Reach 31 OPTION 2: Craig Goch Regulation of Severn 35 5.2.1 Enlarged Craig Goch Reservoir 35 5.2.2 Tunnel Aqueduct to River Severn (Llanidloes) 38 5.2.3 River Severn, Llanidloes to Coalport 38 5-2.4 River Severn, Coalport to Deerhurst 41 5.2.5 Sevem-Thames Transfer 42 OPTION 3: Craig Goch Regulation of Wye 43 5.3.1 Enlarged Craig Goch 43 5.3.2 Tunnel to Nannerth 44 5.3.3 River Wye, Nannerth to Ross-on-Wye 44 5.3.4 Pipeline, Ross to Deerhurst 48 5.3.5 Deerhurst-Thames Transfer 48 OPTION 4: Vymwy Redeployment for Severn Regulation 49 5.4.1 Vymwy Reservoir 50 5.4.2 River Vymwy to Severn Confluence 50 5.4.3 River Severn, Vyrnwy Confluence to Deerhurst 52 5.4.4 Sevem-Thames Transfer 53 5.4.5 River Thames, Buscot to Egham Reach 53 5.4.6 Knock-on Resource Development in North West Region 53 OPTION 5: South West Oxfordshire Reservoir Regulating Thames 53 5.5.1 South West Oxfordshire Reservoir 54 5.5.2 River Thames, Culham to Egham Reach 55 OPTION 6: Canal Transfer, Sevem-Thames 57 5.6.1 Pipeline, Severn (Coalport) to River Penk’ 59 5.6.2 River Penk to River Sow Confluence 59 5.6.3 River Sow to Trent and Mersey Canal 59 5.6.4 Trent and Mersey Canal, Great Heywood Junction to Fradley Junction 59 5.6.5 Coventry Canal, Fradley Junction to Hawkesbury Junction 62 5.6.6 Oxford Canal, Hawkesbury Junction to Isis Lock 63 5.6.7 River Thames Downstream of Oxford Canal 64 OPTION 7: Severn to Trent Transfer 65 5.7.1 Severn Upstream/Downstream of Coalport 65 5.7.2 Pipeline, Coalport to Lower Drayton on River Penk 67 5.7.3 River Penk, Lower Drayton to Confluence with River Sow ______68 5.7.4 River Sow, from'River‘Penk Confluence to River Trent Confluence 70 5.7.5 River Trent Downstream of River Sow Confluence 71 A4.24 7.0/AW/3122/N RAEAAPP.R02 5.8 OPTION 8: Great Bradley Reservoir with Ely Ouse- Essex Scheme 73 5.8.1 Great Bradley Reservoir 73 5.8.2 Ely Ouse Downstream of Denver 75 5-8.3 River Stour Downstream of Reservoir 79 5.8.4 River Pant/Blackwater 82 5.9 OPTION 9: Unsupported Trent to Essex Transfer 84 5.9.1 River Trent Downstream of Torksey Intake 85 5.9.2 Fossdyke Navigation from Torksey to River Witham 87 5.9.3 River Witham 89 5.9.4 Pipeline Witham - Ely Ouse 91 5.9.5 Ely Ouse-Essex Scheme 91 5.9.6 River Stour 92 5.9.7 River Pant/Blackwater 95 5.10 OPTION 10: Broad Oak Reservoir 97 5.10.1 Broad Oak Reservoir 98 5.10.2 River Stour, Downstream of Intake at Plucks Gutter 98 5.10.3 Sarre Penn, Downstream of Reservoir 102 5.11 Other Options 104 5.11.1 Surface Water Schemes 104 5.11.2 Groundwater Schemes 106 5.11.3 Alternative Transfer Options 109 5.11.4 Desalination 111 6. COMPARISON OF OPTIONS AND KEY ISSUES 113 6.1 Alternative Strategies 113 6.2 Thames Region 115 6.3 Severn-Trent Region 117 6.4 Anglian Region 118 6.5 Southern Region 119 6.6 Discussion 120 7. FURTHER STUDY REQUIREMENTS 122 7.1 Strategic Studies 122 7.2 Option Specific Studies 123 8. CONCLUSIONS AND RECOMMENDATIONS 124 8.1 Review of Literature and Existing UK Schemes 124 8.2 Development of Environmental Assessment Methodology 124 8.3 Results of Environmental Assessment 125 8.4 Requirements for Further Studies 127 Reft *4.247.0/ AW/ 3122/NRAEAAPP. R02 TABLES After Page No. 4.1 River/Canal Framework for Assigning Sensitivity 22 4.2 Reservoir/Pipeline Framework for Assigning Sensitivity ' 22 4.3 River/Canal Framework for Assessing Risk of Significant Impact 22 4.4 Reservoir/Pipe line Framework for Assessing Risk of Significant Impact 22 5.1 Option 1 Environmental Assessment 23 5.2 Option 2 Environmental Assessment 35 5.3 Option 3 Environmental Assessment 43 5.4 Option 4 Environmental Assessment 50 5.5 Option 5 Environmental Assessment 54 5.6 Option 6 Environmental Assessment 58 5.7 Option 7 Environmental Assessment 65 5.8 Option 8 Environmental Assessment 73 5.9 Option 9 Environmental Assessment 85 5.10 Option 10 Environmental Assessment 98 6.1 Advantages and Disadvantages of Strategic Options 114 FIGURES 2.1 River Severn Regulation Options 6 2.2 Severn-Trent Transfer and South West Oxfordshire Reservoir Options6 2.3 Severn-Thames Canal Transfer and Severn Trent Transfer Options 6 2.4 Trent-Ess ex and Great Bradley Reservoir Options 6 4.1 Environmental Assessment Framework 20 6.1 Environmental Assessment of Strategic Options Summary Matrix 114 Reft M .247.0/AW / 3122/ NRAEAAPP.R02 APPENDIX A Terms of Reference Ref: 84.247.0/WP/ET/3122/NRAEAFLY.R02 NATIONAL MYERS AUTHORITY TENDER FOR ENVIRONMENTAL ASSESSMENT CONSULTANCYr CONTENT • Instructions to Tenderers © Terms of Reference (including Pricing Schedule) • Conditions of Contract • Form of Tender February 1993 INSTRUCTIONS TO TENDERERS 1.1 THE TENDER DOCUMENTS AND ACKNOWLEDGEMENT OF RECEIPT Companies invited to Tender shall have received two sets of documents listed in the covering letter. Following receipt of the Tender documents the Tenderer shall promptly acknowledge receipt of the documents in writing indicating whether or not it is intended to submit a Tender. 1.2 AMENDMENTS Prior to the final date for submission of tenders the Authority may issue amendments to clarify, modify or add to the Tender documents. A copy of each amendment will be issued to each Tenderer and shall become part of the Tender documents; receipt thereof shall be acknowledge in writing by return. 1.3 PREPARATION OF TENDER The Tenderer shall be responsible for obtaining all information necessary to submit a Tender. A request for clarification relating to information contained within the tender documents should be made to the Purchasing Officer, in writing, not less than four working days before the closing date for receipt of Tenders. If any doubt should remain, the Tenderer shall when tendering, set forth the same in a separate Schedule marked "Additional Information”. 1.4 SUGGESTIONS FOR MODIFICATION TO TERMS OF REFERENCE If the Tenderer considers that he can offer any advantage by any modification to the Terms of Reference such suggested modifications should be detailed in a separate schedule.