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Final Drought Plan

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Final Drought Plan Final Drought Plan April 2017 Main Report (Addendum added June 2020 at start of plan) THAMES WATER UTILITIES LTD FINAL DROUGHT PLAN MAIN REPORT Table of Contents S1 Overview of Drought Plan 2016 ......................................................................................... 10 S2 Summary Overview ............................................................................................................ 11 S2.1 Regulatory requirements ...............................................................................................11 S2.2 Water Supply in the Thames Catchment and Drought .................................................13 S2.3 Water Resource Strategy and Drought Management...................................................13 S2.4 Drought Management Methodology ..............................................................................15 S2.5 Demand-side measures ................................................................................................16 S2.6 Supply-side measures ...................................................................................................21 S2.7 Communications Strategy .............................................................................................25 S2.8 Effectiveness of the Drought Plan .................................................................................26 S2.9 Conclusions ...................................................................................................................28 Section 1. Regulatory Requirements ............................................................................................. 31 1.1. Introduction ....................................................................................................................31 1.2. Public Consultation ........................................................................................................33 1.3. Defra Directions 2007 ....................................................................................................34 1.4. Additions and amendments to Drought Plan 2010 retained for Drought Plan 2016 ....34 1.5. Review process .............................................................................................................38 Section 2. Water Supply in the Thames Catchment and Drought ................................................ 39 2.1. Water supply and the importance of groundwater ........................................................39 2.2. Annual recharge cycle ...................................................................................................39 2.3. Historic droughts and drought vulnerability ...................................................................40 2.4. Hydrometric monitoring .................................................................................................41 2.5. Water Situation Report (WSR) ......................................................................................41 2.6. Groundwater monitoring ................................................................................................42 2.7. Summary........................................................................................................................42 Section 3. Water Resource Strategy and Drought Management.................................................. 44 3.1. Consistency between the Water Resources Management Plan (WRMP) and the Drought Plan ..................................................................................................................................44 3.2. Levels of service ............................................................................................................45 3.3. Thames Water’s Water Resource Zones ......................................................................45 3.4. Supply demand balance ................................................................................................46 3.5. The importance of the London WRZ and the Lower Thames Operating Agreement ..47 3.6. Abstraction Incentive Mechanism (AIM)........................................................................49 3.7. Summary........................................................................................................................50 Section 4. Drought Management Methodology ............................................................................. 52 4.1. Overview ........................................................................................................................52 4.2. Approach for each Water Resources Zone (WRZ) .......................................................52 4.3. Protocol for London WRZ ..............................................................................................54 4.4. SWOX WRZ ...................................................................................................................69 4.5. Protocol for Kennet Valley WRZ....................................................................................74 4.6. Protocol for Guildford WRZ ...........................................................................................80 4.7. Protocols for Slough/Wycombe/Aylesbury and Henley WRZs .....................................82 4.8. Return to normal conditions - process ..........................................................................84 4.9. Post Drought Review .....................................................................................................85 4.10. Summary........................................................................................................................86 Section 5. Demand-side measures ............................................................................................... 87 5.1. Overview ........................................................................................................................87 5.2. Savings from demand-side restrictions .........................................................................89 5.3. Water Efficiency .............................................................................................................91 -3 - THAMES WATER UTILITIES LTD FINAL DROUGHT PLAN MAIN REPORT 5.4. Leakage reduction .........................................................................................................93 5.5. Temporary Use Ban restrictions, including sprinkler and unattended hosepipe ban ...95 5.6. Drought Direction 2011................................................................................................100 5.7. Emergency Restrictions - Level 4 of Levels of Service .............................................101 5.8. Summary of demand-side measures and activities ....................................................104 Section 6. Supply-side measures ................................................................................................ 107 6.1. Introduction ..................................................................................................................107 6.2. London WRZ ................................................................................................................114 SWOX WRZ .................................................................................................................................123 6.3. Kennet Valley WRZ .....................................................................................................125 6.4. Guildford WRZ .............................................................................................................126 6.5. Slough/Wycombe/Aylesbury WRZ ..............................................................................126 6.6. Henley WRZ.................................................................................................................128 6.7. In extremis options.......................................................................................................128 6.8. Permits and approvals required for drought options implementation. ........................129 Section 7. Communications Strategy .......................................................................................... 132 7.1. Introduction ..................................................................................................................132 7.2. Objectives ....................................................................................................................132 7.3. Key Messages .............................................................................................................132 7.4. Stakeholders ................................................................................................................133 7.5. Means of Communication ............................................................................................136 7.6. When to Communicate ................................................................................................137 7.7. Consultation, feedback and effectiveness of communications ...................................137 7.8. Learning points from 2012 drought .............................................................................138 7.9. Learning points from customer survey research 2011................................................140 7.10. Communications Plan..................................................................................................141 Section 8. Effectiveness of Plan .................................................................................................. 142 8.1. Effectiveness
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