water and sanitation
Water and Sanitation
DWA’s Long-term Water
Requirement Scenarios
Presentation to Rand Water Services Forum
Dragana Ristic- 15 October 2014
DS: National Water Planning
1
Relevant Studies
• Development of Water Supply Reconciliation
Strategy for the Vaal River
• Integrated Water Quality Management Plan
On-going Study
• Maintenance of the Vaal River Reconciliation
Strategy
Integrated Vaal River System
Existing Transfer Schemes
Proposed Transfer Schemes
Mokolo Catchment
Lephalale
Crocodile Catchment
Vaal Catchment
Komati-Olifants
Upper Olifants
Mainly Power Stations
Lephalale
Rand Water
Sasol
Midvaal
Water
Vaal Gamagara
Transfer Scheme
Vaalharts
Iirrigation
Scheme
Heyshope
Transfer
Scheme
Sedibeng
Water
Zaaihoek
Transfer
Scheme
LHWP#1
3
Tuhkela-Vaal
Transfer Scheme
4
Complex Issues
• Dynamic area with huge growth in water
requirements and need to sustain water for
social and economic activities
• Complex infrastructure system
• Efficient use of scarce resource important
• All users contribute to the effluent and
complex water quality issues
• We need to ensure there will be enough
water for this important area
5
Background to the Integrated Vaal River studies
• Various studies were done over many years
• It culminated in the Vaal River Reconciliation
Strategy Study
• Stakeholders participation in Steering
Committee is continuing
• Strategy is presented at various stakeholder
workshops
6
Future Options to Reconcile
Focus of Vaal Reconciliation Strategy Study:
• Options for augmentation limited
• Need to balance supply and demand
• Develop strategies (scenario based) to meet growing
water requirements
• Find best reconciliation solution i.t.o.
– Least cost (to end user)
– Long term vision
– Maximize future flexibility
• Involvement of stakeholders
7
Vaal River Reconciliation Strategy
Ensuring that sufficient water is available to supply
the future requirements of the Vaal River System
requires five pillar strategy:
• Eradicate unlawful water use by the year 2014
• Reduction in water use by 15% through WC/WDM
by 2015
• Re-use of treated effluent
– Starting with AMD and ready by 2015
• Augmentation (LHWP Phase 2) by 2020
• Continuation of Strategy Steering Committee
8
Linkages with Crocodile & Mokolo
Growth areas
Mokolo Catchment
Urban
Mining
Proposed Transfer
Crocodile West Catchment
Vaal Catchment
Treated Urban
Return Flows
Continental divide
Transfer from Vaal River
via. Rand Water System
9
Lephalale water balance
Mokolo Crocodile Water Augmentation Project - Phase 2
Water Requirements and Water Availability
180
160
140
Lephalale water
requirements (Apr 2013)
Lephalale water
requirements (July 2012)
million m3/a
120
100
80
60
40
20
Critical period
Transfer to Lephalale
0
Water available at Vlieëpoort
for transfer
Water Requirement Scenarios (2014)
(Net System Demand)
11
Reconciliation Scenario (1)
12
Reconciliation Scenario (2)
High with target WC/WDM
Desalination of Mine Water
Unlawful removed
Yield / Water Requirements (million m3/a)
3800
High Water Requirement Scenario with
Water Conservation and Demand Management
3600
3400
3200
Polihali Dam Yield
3000
2800
2600
2400
2005
2010
Yield increases due to
removal of dilution releases
AMD reuse
System
Yield
2015
2020
2025
2030
2035
2040
Desalinate AMD
First transfer from LHWP Phase II
13
2045
2050
Reconciliation Scenario (3)
High with target WC/WDM
Unlawful removed
Re-use 80% of surplus yield in
the Crocodile West River System
High Water Requirement Scenario with
Water Conservation and Demand Management & Re-use
3800
Yield / Water Requirements (million m3/a)
Desalination of Mine Water
3600
3400
3200
Polihali Dam Yield
3000
2800
2600
2400
2005
2010
Yield increases due to
removal of dilution releases
AMD reuse
System
Yield
2015
2020
2025
2030
Desalinate AMD
2035
2040
2045
First transfer from LHWP Phase II
14
2050
Vaal River Reconciliation Strategy
Ensuring that sufficient water is available to supply
the future requirements of the Vaal River System
requires a now six pillar strategy:
• Eradicate unlawful water use by the year 2014
• Continue with the reduction in water use by 15%
through WC/WDM to achieve further targets by
2015
• Re-use of treated effluent
– Started with AMD and ready by mid 2018
– Starting with investigating re-use of treated waste water
in Crocodile West System to reduce demand from Vaal
• Augmentation (LHWP Phase 2) by 2023
• Continuation of Strategy Steering Committee
15
Thank you
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