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WCWSS Serves more than 3 million people –Supply to Cape Town and some West Coast, Boland, Swartland and Overberg towns Irrigation –In the Berg, Eerste.

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Presentation on theme: "WCWSS Serves more than 3 million people –Supply to Cape Town and some West Coast, Boland, Swartland and Overberg towns Irrigation –In the Berg, Eerste."— Presentation transcript:

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2 WCWSS

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4 Serves more than 3 million people –Supply to Cape Town and some West Coast, Boland, Swartland and Overberg towns Irrigation –In the Berg, Eerste and Riviersonderend rivers –Production of 50% of SA’s irrigated agricultural export High economic growth and migration into the system area Infrastructure owned by the DWAF, City of Cape Town (CCT) & Eskom Berg Water Project under construction near Franschhoek The Western Cape Water Supply System

5 90% runoff in Winter (May to Oct) 70% requirements in summer (Nov to Apr) 50% of system dams’ storage needed to store winter water for usage in summer 50% of system dams’ storage provides carry-over storage for drought periods Dams are operated to minimise spillage Droughts are managed by progressively restricting supplies WCWSS characteristics

6 To update and review water requirements and interventions to meet requirements To engage stakeholders and the general public To develop toolkits to assist with the future reconciliation of supply and requirement To provide a guide for decision-making towards effective reconciliation of supply and requirement To recommend preparatory measures, actions and assign responsibilities PURPOSE OF THE RECONCILIATION STRATEGY

7 Management of Study Professional Service Provider Steering Committee  DWAF HO  DWAF RO  CCT  Saldanha Mun.  Provincial Dept. of Agric  Province National Water Resource Planning Study Management RECONCILIATION STRATEGY STUDY Public participation Selected Stakeholder input

8 Reconciliation StrategyCCT WC/WDM Strategy CCT WSDP CCT’s Integrated Development Plan (IDP) Provincial Integrated Development Plan Berg Catchment Management Strategy Other WSDPs Institutional Planning Process

9 NEWSLETTER 1 PUBLIC MEETING To identify and provide feedback on interventions NEWSLETTER 2 PUBLIC MEETING To provide feedback on interventions for comment August 2005: Screening of Interventions Workshop Refine reconciliation scenarios and strategy content through stakeholder workshops and technical focus groups Input from the Berg and Breede-Overberg CMA Reference Groups NEWSLETTER 3 Summary of strategy to public for comment Determine and analyse a range of implementation scenarios Input from the Berg and Breede-Overberg CMA Reference Groups NEWSLETTER 4 Obtain public feedback on scenarios through press release and newspaper advert PUBLIC MEETING To present the Reconciliation Strategy and selected interventions for further study Strategy Steering Committee to consider comments DWAF WRFMC CCT Portfolio Committee CCT Mayco and Council Berg CMA Reference Group PUBLIC PROCESS FOLLOWED

10 STRATEGY THEMES Strategy Protection and Management Comparison of supply and requirement Selection of intervention s Stakeholder Engagement Implementatio n and Performance monitoring Monitoring and Information Management Water Availability Water Requirements Water Use Efficiency

11 Reconciliation Strategy 9 Themes each containing Key issues Objectives Approach Action Responsibility Programme Scenario Planning for Reconciliation of Supply and Requirement Treated Effluent use Supporting Reports WC/WDM Determination of Future Water Requirements Structure of Study Key Reports

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14 CCT 8-yr WC/WDM Strategy Additional Longer-term WC/WDM Groundwater Interventions Surface Water Interventions Treated Effluent use Desalination Options/ Interventions Identified

15 Additional Longer-term WC/WDM Groundwater Interventions Surface Water Interventions Treated effluent use Desalination  Pressure Reduction  Leak Detection and Repair  Meter management and replacement  Consumer awareness  School Education  Plumbing retro-fit prg  Support for large consumers  Re-use: Parks and Industry  Management Information System  Upgrade telemetry system CCT 8-yr WC/WDM Strategy

16 Additional Longer-term WC/WDM Groundwater Interventions Surface Water Interventions Treated Effluent use Desalination  Tariffs, metering and credit control  Eliminate AFUs  Promotion of private boreholes & wells  Leak detection  Water Efficient Fittings  User Education

17 CCT 8-yr WC/WDM Strategy Additional Longer-term WC/WDM Groundwater Interventions Surface Water Interventions Treated Effluent use Desalination  Newlands Aquifer  Cape Flats Aquifer  West Coast Aquifers  TMG Aquifer

18 CCT 8-yr WC/WDM Strategy Additional Longer-term WC/WDM Groundwater Interventions Surface Water Interventions Treated Effluent use Desalination  Voëlvlei Phase 1  Michell’s Pass Diversion  24 Rivers Dam  Upper Wit River Diversion  Raise Steenbras Lower Dam  Upper Molenaars

19 CCT 8-yr WC/WDM Strategy Additional Longer-term WC/WDM Groundwater Interventions Surface Water Interventions Treated Effluent use Desalination  Treated Effluent use Irrig./ind  Dual Reticulation  Commercial Irrig. Exchange  Treated Effluent use to Potable standards  Berg River Exchange

20 CCT 8-yr WC/WDM Strategy Additional Longer-term WC/WDM Groundwater Interventions Surface Water Interventions Treated Effluent use Desalination  CCT Pilot Plant  Desalination Plant

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22 Scenario Planning The objective of the Scenario Planning Process is to identify, evaluate and assess alternative groupings and phasing of interventions so as to determine the potential impacts and benefits of possible combinations of interventions to reconcile water supply and requirement in the WCWSS, up to 2030.

23 SCENARIO 1SCENARIO 2SCENARIO 3 ILLUSTRATES IMPACT OF WC/WDM ON TIMING OF IMPLEMENTATION OF SUPPLY INTERVENTIONS NO WC/WDM CCT WC/WDM strategy implemented CCT WC/WDM strategy implemented & additional WC/WDM interventions

24 SCENARIODESCRIPTION Scenario1 No WC/WDM, but all supply interventions can be implemented Objective: To determine the impact of not implementing WC/WDM KEY FINDINGS  Supply Intervention required by 2011  Due to long lead times earliest supply intervention could only be implemented by 2014  Shortfall in supply between 2011 and 2013

25 SCENARIODESCRIPTION Scenario 2 CCT WC/WDM strategy implemented as well as supply interventions. Objective: To determine the impact of implementing the CCT’s WC/WDM strategy KEY FINDINGS  Supply intervention required by 2015  Implementation of CCT’s WDM strategy and programme delays supply intervention by 4 years

26 SCENARIODESCRIPTION Scenario 3 CCT WC/WDM strategy and programme implemented as well as additional longer term WC/WDM interventions and supply interventions. Objective: To determine the impact of implementing all the WC/WDM interventions KEY FINDINGS  Implementation of comprehensive WC/WDM could potentially delay supply intervention until approx  Comprehensive WC/WDM (100% successful implementation) can effect a saving of approx 100 million m 3 of water per annum by 2019

27 ILLUSTRATES IMPACT OF LOWEST URV SELECTION AS WELL AS IMPACT OF IMPLEMENTING ECOLOGICAL RESERVE AND POTENTIAL IMPACT OF CLIMATE CHANGE SCENARIO 7SCENARIO 8SCENARIO 9 CCT WC/WDM strategy & Lowest URV Interventions CCT WC/WDM strategy, Lowest URV Interventions & Ecological Reserve CCT WC/WDM strategy, Lowest URV Interventions & Possible Climate Change

28 SCENARIODESCRIPTION Scenario 7 CCT WC/WDM strategy implemented, thereafter selection based on URV. Objective: To determine the impact of selecting interventions based on lowest URV KEY FINDINGS  A mix of supply and demand interventions are available for selection in order to offset the anticipated shortfall in supply in  Net present value of this option is R1 092 million

29 Scenario 7: CCT WC/WDM strategy implemented, thereafter selection based on URV No.WC/WDM InterventionSupply Intervention 17 TMG Scheme 1 16 TMG Scheme 2 15WC/DM: User Education 14 TMG Scheme Rivers Dam 12 West Coast Aquifers 11WC/DM: Use of Water Efficient Fittings 10 Cape Flats Aquifer 9 Treated Effluent - Irrig./Ind 8 Voëlvlei Phase 1 7 Upper Wit River Diversion 6 Newlands Aquifer 5 WC/DM: Promotion of private boreholes & wells 4WC/DM: Leakage detection and repair 3WC/DM: Eliminate auto flush urinals 2WC/DM: Tariffs, metering and credit control 1CCT WC/WDM 8-year strategy

30 SCENARIODESCRIPTION Scenario 8 CCT WC/WDM strategy implemented, thereafter selection based on URV with the ecological Reserve being phased in for existing water resources Objective: To determine how the implementation of the ecological Reserve will impact on the selection of interventions KEY FINDINGS  The yield of the existing water resources decreased by approx. 46 million m 3.  Supply and demand interventions are available  Net present value of this option is R1 263 million.  Cost of implementing additional interventions in order to offset the anticipated decrease in system yield is approximately R171 million in today’s terms.

31 Scenario 8: CCT WC/WDM strategy implemented, thereafter selection based on URV with the ecological Reserve being phased in for existing water resources No.WC/WDM InterventionSupply Intervention 19 Lourens River Diversion 18 Raise Lower Steenbras Dam 17 TMG Scheme 1 16 TMG Scheme 2 15WC/DM: User Education 14 TMG Scheme Rivers Dam 12 West Coast Aquifers 11WC/DM: Use of Water Efficient Fittings 10 Voëlvlei Phase 1 9 Treated Effluent - Irrig./Industrial 8 Cape Flats Aquifer 7 Upper Wit River Diversion 6 Newlands Aquifer 5WC/DM: Promotion of private bore & well 4WC/DM: Leakage detection and repair 3WC/DM: Eliminate auto flush urinals 2WC/DM: Tariffs, metering and credit control 1CCT WC/WDM 8-year strategy

32 SCENARIODESCRIPTION Scenario 9 CCT WC/WDM strategy implemented, thereafter selection based on URV with the potential for climate change being factored in Objective: To determine how climate change could impact on the selection of interventions KEY FINDINGS  The yield from the existing water resources and future water resources was assumed to decrease by approx. 107 million m 3.  Supply and demand interventions are available for selection  Cost of impact is approx. R572 million

33 Scenario 9: CCT WC/WDM strategy implemented, thereafter selection based on URV with the potential for climate change being factored in No.WC/WDM InterventionSupply Intervention Treated Effluent use - dual reticulation Eerste River Diversion Lower Wit River Dam 19 Lourens River Diversion 18 Raise Lower Steenbras 17 TMG Scheme 1 16 TMG Scheme 2 15WC/DM: User Education 14 TMG Scheme Rivers Dam 12 West Coast Aquifer (Langebaan Road) 11WC/DM: Use of Water Efficient Fittings 10 Upper Wit River Diversion 9 Voëlvlei Phase 1 8 Treated Effluent use- Irrig./Industrial 7 Cape Flats Aquifer 6 Newlands Aquifer 5WC/DM: Leakage detection and repair 4WC/DM: Promotion of private boreholes & wells 3WC/DM: Eliminate auto flush urinals 2WC/DM: Tariffs, metering and credit control 1CCT WC/WDM 8-year strategy

34 ”CONSERVATIVE SELECTION” AND IMPACT OF IMPLEMENTING ECOLOGICAL RESERVE AND POTENTIAL IMPACT OF CLIMATE CHANGE SCENARIO 10(A)SCENARIO 10(B)SCENARIO 10(C) CCT WC/WDM strategy & conservative Selection of Interventions CCT WC/WDM strategy, conservative Selection of Interventions, Ecological Reserve & Climate Change All WC/WDM interventions, conservative Selection of Interventions, Ecological Reserve & Climate Change

35 Additional longer-term WC/WDM interventions –Equates to approx 50% of the modelled potential WC/WDM saving –Uncertainties regarding actual savings achievable Newlands Aquifer –Small yield –Potential impact on river flow and existing users Cape Flats Aquifer –Perceived O&M concerns of sustainability of operating wellfield in a relatively high density area Upper Wit River Diversion –Potential difficulties in obtaining environmental approvals Scenario 10 (a) to (c) “Conservative Selection” Reasons for omitting specific interventions:

36 SCENARIODESCRIPTION Scenario 10 (a) CCT WC/WDM strategy, thereafter selection based on a conservative selection of interventions Objective: To determine the impact of selecting a “conservative portfolio” KEY FINDINGS  Supply interventions would have to be “fast tracked”.  To avoid “fast tacking” WC/WDM would have to be successfully implemented  Net present value of this option is R1 844 million (this is in comparison to a NPV of R742 million for Scenario 7, which was based on least cost selection and not a selection based on considerations of practicality and sustainability).

37 Scenario 10 (a): CCT WC/WDM strategy, thereafter selection based on a conservative selection of interventions No.WC/WDM InterventionSupply Intervention 9 Treated Effluent use - potable 8 Upper Molenaars (To Berg River Dam) 7 TMG Scheme 2 6 Lourens River Diversion 5 Raise Lower Steenbras (fast tracked) 4 Treated Effluent use - Irrig./Industrial 3 Voëlvlei Phase 1 (fast tracked) 2 TMG Scheme 1 (fast tracked) 1CCT WC/WDM 8-year strategy

38 SCENARIODESCRIPTION Scenario 10 (b) CCT WC/WDM strategy, thereafter selection based on a conservative selection of interventions including potential impacts of ecological Reserve and climate change Objective: To determine how the implementation of the Reserve and the potential for climate change could impact on the selection of interventions KEY FINDINGS  Supply interventions would have to be “fast tracked”.  Net present value of this option is R million.  Cost impact of climate change and implementing the Reserve is approx R million

39 Scenario 10 (b): CCT WC/WDM strategy, thereafter selection based on a conservative selection of interventions including potential impacts of ecological Reserve and climate change No.WC/WDM InterventionSupply Intervention 10 Desalination 1 Generic 9 Treated Effluent use - potable 8 Upper Molenaars (To Berg River Dam) 7 TMG Scheme 2 (fast tracked) 6 Raise Lower Steenbras Dam (fast tracked) 5 Lourens River Diversion 4 Voëlvlei Phase 1 (fast tracked) 3 Teated Effluent use - Irrig./Industrial (fast tracked) 2 TMG Scheme 1 (fast tracked) 1CCT WC/WDM 8-year strategy

40 SCENARIODESCRIPTION Scenario 10 (c) All WC/WDM interventions implemented, thereafter selection based on a conservative portfolio of interventions, including potential impacts of ecological Reserve and climate change Objective:To determine how the implementation of longer term WC/WDM interventions impacts on Scenario 10(b) KEY FINDINGS  Additional WC/WDM interventions delay supply intervention by 3 years  Net present value of this option is R2 718 million.  Benefit of delaying desalination by implementing additional WC/WDM interventions is approx R1 759 million

41 Scenario 10 (c): All WC/WDM interventions implemented, thereafter selection based on a conservative portfolio of interventions, including potential impacts of ecological Reserve and climate change No.WC/WDM InterventionSupply Intervention 15 Treated Effluent use- potable 14 Upper Molenaars (To Berg River Dam) 13 Lourens River Diversion 12 TMG Scheme 1 11 TMG Scheme 2 10 Raise Lower Steenbras Dam (fast tracked) 9 Voëlvlei Phase 1 8WC/DM: User Education 7WC/DM: Use of Water Efficient Fittings 6 Treated Effluent - Irrig./Industrial 5WC/DM: Leakage detection and repair 4WC/DM: Eliminate auto flush urinals 3 WC/DM: Promotion of private boreholes & wells 2 WC/DM: Adjustment of water tariffs, metering and credit control 1CCT WC/WDM 8-year strategy

42 ILLUSTRATES IMPACT OF LOW WATER REQUIRMENT CURVE SCENARIO 11 Low Water Requirement Curve CCT WC/WDM strategy & intervention selection based on URV

43 SCENARIODESCRIPTION Scenario 11 The low water demand requirement curve formed the basis of this analysis. CCT WC/WDM strategy implemented, thereafter selection based on URV Objective: To determine how the low water requirement curve and the least URV selection criteria could impact on the selection of interventions KEY FINDINGS  The Low Water Requirement curve would delay the next intervention (after the implementation of the CCT’s WC/WDM strategy) until 2024.

44 CONCLUSIONS Successful implementation of CCT’s WC/WDM 8-year strategy and programme is essential Additional longer-term WC/WDM interventions just as important Groundwater options very important – especially TMG Treated effluent use has massive potential. Treated effluent for potable use may be required as early as 2020 Desalination of seawater as long term “back-up” Feasibility studies should commence on both demand and supply interventions to ensure reconciliation of supply and requirement A Strategy Committee should be formed to ensure implementation of the strategy

45 Interventions Selected for Additional Study CCT WC/WDM Strategy and Programme Michell's Pass Diversion WC/WDM Adjustment of water tariffs, metering and credit control Newlands Aquifer WC/WDM Eliminate auto flush urinalsCape Flats Aquifer WC/WDM Promotion of private boreholes and wells West Coast Aquifer Recharge (Langebaan Road Aquifer) WC/WDM Leakage detection and repair Upper Wit River Diversion WC/WDM Use of water-efficient fittings Raising Steenbras Lower Dam WC/WDM User educationLourens River Diversion Scheme Voëlvlei Phase 1Treated effluent use Upper Molenaars Diversion

46 Strategy Committee A Strategy Committee should be established with the following objectives: To ensure that the strategy is relevant and updated, To monitor and co-ordinate the implementation of the relevant actions identified in the strategy, and To make recommendations on long-term planning activities required to ensure reconciliation of requirement and available supply in the WCWSS area A support group should be established to provide administrative scientific and technical support to the Strategy Committee

47 WC Provincial Government ( 5 REPRESENTATIVES) Local Authorities ( 5 REPRESENTATIVES)  City of Cape Town: 3 representatives  West Coast District Municipality: 1 representative  Cape Winelands District Municipality: 1 representative Department of Water Affairs and Forestry ( 9 REPRESENTATIVES)  Regional Office: 3 representatives  Integrated Water Resource Planning: 3 representatives  Water Use Efficiency: 1 representative  Water Resource Infrastructure Branch: 2 representatives Catchment Management Agencies (when established) ( 2 REPRESENTATIVES)  Berg CMA : 1 representative  Breede-Overberg CMA: 1 representative Water User Associations ( 2 REPRESENTATIVES)  Berg WUA: 1 representative  Breede-Overberg WUA: 1 representative Representation on Strategy Steering Committee 23 REPRESENTATIVES

48 RECOMMENDATIONS It is recommended that: A Strategy Steering Committee be formed to oversee the implementation of the Strategy The CCT and other WSAs should implement their WC/WDM strategies and programmes The CCT and other WSAs should develop integrated policies on treated effluent use and determine the full future potential for treated effluent use The CCT should continue with the TMG Feasibility Study and Pilot Project and the Desalination Pilot Plant as these could be significant future water resources The DWAF and the CCT should initiate studies on a number of interventions to ensure the reconciliation of supply and requirement

49 Thank you ANY QUESTIONS


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