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Water Reconciliation Strategy Study for the Algoa Water Supply Area I

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Water Reconciliation Strategy Study for the Algoa Water Supply Area I Water Reconciliation Strategy Study for the Algoa Water Supply Area i Directorate: National Water Resource Planning Aurecon Project No. 402448 Water Reconciliation Strategy Study for the Algoa Water Supply Area ANNEXURE A: INTERVENTIONS WORKSHOP October 2009 Prepared by: Aurecon South Africa (Pty) Ltd P O Box 494 Cape Town South Africa 8000 Tel: 021 – 481 2400 Fax: 021 - 424 5588 e-mail: [email protected] Prepared for: Director: National Water Resource Planning Department of Water Affairs Private Bag X313 Pretoria South Africa Tel: 012 – 336 8647 Fax: 012 – 338 8295 e-mail: [email protected] Annexure A : Interventions Workshop Oct 2009 Water Reconciliation Strategy Study for the Algoa Water Supply Area iii This report is to be referred to in bibliographies as: Department of Water Affairs, South Africa. 2009. Annexure A Interventions Workshop. Prepared by E van der Berg and Dr MJ Shand of Aurecon and by D Van Reenen of Afri-Coast, Engineers and R Eberhard of PDG as part of the Water Reconciliation Strategy Study for the Algoa Water Supply Area. DWA Report No. WMA 15/M00/00/1409/04. Annexure A : Interventions Workshop Oct 2009 Water Reconciliation Strategy Study for the Algoa Water Supply Area iv Water Reconciliation Strategy for the Algoa Water Supply Area Study Reports Aurecon Report Name DWA Report Number Report number Impact of Changed Crops on Water Quality in WMA 15/M00/00/1409/01 5004 the Great Fish River Preliminary Reconciliation Strategy WMA 15/M00/00/1409/02 5005 Inception WMA 15/M00/00/1409/03 5006 Algoa Reconciliation Strategy WMA 15/M00/00/1409/04 5007 Annexure A: Interventions Workshop WMA 15/M00/00/1409/04 5007A Annexure B: Public Participation WMA 15/M00/00/1409/04 5007B Annexure A : Interventions Workshop Oct 2009 Water Reconciliation Strategy Study for the Algoa Water Supply Area v EXECUTIVE SUMMARY: ANNEXURE A: INTERVENTIONS The following potential augmentation interventions are described in this document: SECTION A: Agricultural Water Conservation and Demand Management A1: Compulsory licensing for NMBM SECTION B: Urban Water Conservation and Demand Management B1: Introduction to urban water demand management intervention options B2 WC and WDM downstream of consumer meters B3 WC and WDM upstream of consumer meters B4 Rainwater harvesting for household use B5: Rainwater harvesting for gardening SECTION C: Trading of water use authorisations C1: Water trading – Baviaanskloof C2: Water trading – Upper Great Fish River SECTION D: Land use changes D1: Watershed management – Kromme, Kouga and Baviaanskloof SECTION E: Re-use of water E1: Treatment of effluent to industrial standards E2: Treatment of effluent to potable standards E3: Industrial water supply from Coega WWTW E4: Indirect reuse of effluent treated to potable standards with storage in a new dam at Echodale SECTION F: Desalination F1: Desalination – Coega IDZ supply option F2: Desalination - Lower Sundays River return flow F3: Desalination of seawater by NMBM SECTION G: Surface Water Augmentation Schemes G1: Maximising yield of existing Kouga/Loerie Scheme (updated) G2: ORP / Nooitgedagt Low Level Scheme (updated) G3: Diversion of lower Gamtoos River flows G4: Tsitsikamma River diversion G5 Guernakop Dam G6 Kouga Dam replacement and raising SECTION H: Groundwater H1: Jeffreys Arch (Jeffreys Arch hydrogeological domain) H2: Van Stadens River Mouth (Pre-Cape Horst hydrogeological domain) H3 Bushy Park (Elands-Winterhoek Arch hydrogeological domain) H4 South-eastern Coega Fault (Algoa Basin hydrogeological domain) Appendix A describes the urban water demand forecast for the Algoa Water Supply System. Annexure A : Interventions Workshop Oct 2009 Water Reconciliation Strategy Study for the Algoa Water Supply Area vi TABLE OF CONTENTS Page No 1. BACKGROUND AND INTRODUCTION .......................................................................... 1 1.1 THE ALGOA RECONCILIATION STRATEGY STUDY .................................................................... 1 1.1.1 The need for a strategy ........................................................................................................ 1 1.1.2 Strategy objectives............................................................................................................... 1 1.2 THE ALGOA WATER SUPPLY SYSTEM (AWSS) .......................................................................... 1 1.2.1 Overview of the AWSS ........................................................................................................ 1 1.2.2 Operation of the AWSS ....................................................................................................... 3 1.2.3 Current and Potential Future Capacities of Water Treatment Works and Pipelines ........... 3 1.3 YIELD OF THE AWSS ...................................................................................................................... 3 1.4 WATER USE FROM THE AWSS ..................................................................................................... 4 1.4.1 Urban water use ................................................................................................................... 4 1.4.2 Agricultural water use .......................................................................................................... 5 1.4.3 Canal losses ........................................................................................................................ 5 1.4.4 Total current use from the AWSS ........................................................................................ 5 1.4.5 Future Water Requirements including Coega Industrial Development Zone ...................... 5 1.5 WATER BALANCE ........................................................................................................................... 6 1.6 WORKSHOPS .................................................................................................................................. 6 2. INTERVENTIONS SELECTED FOR EVALUATION ............................................................ 7 2.1 SELECTION CRITERIA .................................................................................................................... 7 2.2 EVALUATION OF INTERVENTIONS ............................................................................................... 7 2.2.1 Costing ................................................................................................................................. 7 2.2.2 Programming ....................................................................................................................... 7 2.2.3 Yields ................................................................................................................................... 7 3. SELECTED POTENTIAL AUGMENTATION OPTIONS ....................................................... 8 SECTION A .......................................................................................................................... 10 A1. Verification, validation and abstraction control in the Kouga/Gamtoos, Orange-Fish- Sundays and other catchments of the AWSS ................................................................... 11 SECTION B .......................................................................................................................... 16 B1. Introduction to Urban Water Demand Management Intervention Options .......................... 17 B2. WC and WDM upstream of consumer meters ............................................................... 20 B3. WC and WDM downstream of consumer meters ........................................................... 23 B4. Rainwater harvesting for household use ....................................................................... 26 SECTION C .......................................................................................................................... 31 C1. Water trading - Baviaanskloof ....................................................................................... 32 C2. Water trading – upper Great Fish River ......................................................................... 34 SECTION D .......................................................................................................................... 37 D1. Catchment management in the Kromme, Kouga and Baviaanskloof catchments .......... 38 SECTION E .......................................................................................................................... 43 E1. Treatment of effluent to industrial standards ................................................................. 44 E2. Treatment of effluent to potable standards .................................................................... 48 E3. Industrial Water Supply from Coega WWTW ................................................................ 50 E4. Indirect Reuse of effluent treated to potable standards with storage in a new dam at Echodale ................................................................................................................... 53 SECTION F .......................................................................................................................... 57 F1. Desalination: Coega IDZ supply option ......................................................................... 58 F2. Desalination of lower Sundays River return flows .......................................................... 63 F3. Desalination of seawater ..............................................................................................
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