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Statement of Response

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Statement of Response Statement of Response Draft Water Resources Management Plan 27 February 2009 Thames Water is the UK’s largest water and wastewater services company serving over 13.6 million customers in London and the Thames Valley, supplying an average of 2,600 million litres of drinking water and treating around 2,800 million litres of sewage every day. Information about this publication and further copies are available from: Public Consultation Team Thames Water Clearwater Court Vastern Road Reading RG1 8DB Email [email protected] This document is available to download from the Thames Water website www.thameswater.co.uk Contents List of Tables.............................................................................................................iv List of Figures ............................................................................................................v Executive Summary.................................................................................................. 1 1 Introduction ......................................................................................................... 8 1.1 Purpose of this Statement of Response...................................................... 8 1.2 Overview of the public consultation............................................................. 9 1.3 Summary of responses ............................................................................. 10 2 Responses to the Consultation ......................................................................... 12 2.1 Introduction and background information .................................................. 13 2.2 Current Water Resources Programme, AMP4 (2005 - 2010).................... 30 2.3 Current and future demand for water ........................................................ 32 2.4 Current and future water supply ................................................................ 60 2.5 Allowing for risk and uncertainty – ’Headroom’ ......................................... 80 2.6 Baseline supply demand balance.............................................................. 96 2.7 Appraisal of supply demand options ....................................................... 100 2.8 Water Resources Options ....................................................................... 104 2.9 Preferred supply-demand programme .................................................... 119 2.10 Leakage................................................................................................... 121 2.11 Metering and tariffs.................................................................................. 129 2.12 Water efficiency....................................................................................... 138 2.13 Programme appraisal .............................................................................. 147 2.14 Preferred supply demand programme..................................................... 155 2.15 Sensitivity testing..................................................................................... 158 2.16 Summary of main elements of the preferred programme........................ 160 2.17 Strategic Environmental Assessment (SEA) Environmental Report ....... 161 2.18 Upper Thames Reservoir ........................................................................ 168 2.19 Other issues ............................................................................................ 185 3 Overview of revised plan................................................................................. 195 3.1 Purpose of section................................................................................... 195 3.2 Material changes ..................................................................................... 196 3.3 Revised Baseline Supply Demand Balances .......................................... 200 3.4 Revised preferred programme – approach to selection .......................... 205 3.5 Revised preferred programme – Results of programme appraisal.......... 209 3.6 Components of Preferred Programme - Demand management strategy 222 3.7 Summary of Preferred Programmes and comparison with original Plan. 235 3.8 Concluding statement.............................................................................. 238 4 Next Steps....................................................................................................... 240 Appendix 1: List of statutory consultees .............................................................. 241 Appendix 2: Glossary .......................................................................................... 244 Appendix 3: Schedule of Representations .......................................................... 249 Appendix 4: Updated demand forecasts ............................................................. 250 Appendix 5: Update of Strategic Environmental Assessment London and SWOX Water Resource Zones ........................................................................................... 269 iii List of Tables Table 1: London Water Resource Zone preferred programme............................................ 5 Table 2: Swindon & Oxfordshire Water Resource Zone preferred programme ..................... 6 Table 3: Total number of submissions received by response type..................................... 10 Table 4: Total registrations and submissions from participants by sector........................... 10 Table 5: Comparison of groundwater source Deployable Output in WRP04, WRP06 and the draft Plan............................................................................................................. 25 Table 6: The impacts of demand reduction during a drought in regulatory reporting, Thames Valley and London................................................................................................ 26 Table 7: Assessment to demonstrate the impact on the Deployable Output for London and the Upper Thames ..................................................................................................... 27 Table 8: Build-up of changes in the London demand forecast (1)...................................... 36 Table 9: Thames Water household and population comparison (incl. economic downturn).. 37 Table 10: Property and population growth rate comparison (incl. economic downturn)........ 38 Table 11: Build-up of changes in the London demand forecast (2).................................... 42 Table 12: 2007-08 volume per use in normal and power showers..................................... 48 Table 13: Frequency and Volume per use assumptions for toilets..................................... 49 Table 14: Rate of change in Per Capita Consumption ..................................................... 50 Table 15: Build-up of changes in the London demand forecast (3).................................... 51 Table 16: Revised property Per Capita Consumptions..................................................... 53 Table 17: Build-up of changes in the London demand forecast (4).................................... 53 Table 18: Build-up of changes in the London demand forecast (5).................................... 55 Table 19: Supply demand deficit resulting from scenario testing ...................................... 68 Table 20: Summary of the scenarios evaluated and their impact on Deployable Output...... 71 Table 21: A list of the investigations required in AMP5 (2010-2015) provided by the Environment Agency............................................................................................. 77 Table 22: Baseline Supply demand position in the draft Plan ........................................... 97 Table 23: Baseline supply demand position in the revised draft Plan................................. 98 Table 24: Comparison of supply demand deficit/surplus between draft Plan and revised draft Plan .................................................................................................................... 98 Table 25: Feasible schemes in London Water Resource Zone ....................................... 105 Table 26: Feasible schemes in Swindon & Oxfordshire Water Resource Zone................. 106 Table 27: Leakage reduction over the period 2005 – 2035 (litres/property/day)................ 123 Table 28: Household meter penetration by 2034/35 ...................................................... 131 Table 29: Modelled costs and benefits associated with different meter location choices.... 133 Table 30: Manual or AMR........................................................................................... 133 Table 31: Overall AMR costs and benefits.................................................................... 134 Table 32: Baseline water efficiency programme in revised draft Plan .............................. 141 Table 33: Enhanced water efficiency programme in revised draft Plan ............................ 142 Table 34: Assumptions linked to domestic water audits ................................................. 143 Table 35: Contribution of demand management and water resource schemes to address the supply demand deficit ......................................................................................... 157 Table 36: AMP5 (2010-2015) Level of Service - Planned vs. Actual................................ 191 Table 37: Summary of demographic update in London WRZ.......................................... 196 Table 38: Summary of the impact of the economic downturn in London WRZ .................. 197 Table 39: Summary of household
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