Rand Water Infrastructure Development Plan 2009 - 2035

1. Rand Water Infrastructure Development Plan 2009 - 2035 Mining and Industry Forum May 2009

4. Infrastructure planning criteria Plans for primary and secondary pumping stations over the next 25 years Upgrades to some piping network over the next 15 years Some topics for discussion

5. Planning sequence Data gathering, demand forecasts – average daily demand each year Demand patterns – peak day, week, etc Plant availability – breakdowns, cleaning, repairs Network modelling and system configuration Technical limitations – maximum flow velocity, upper and lower pressures, etc Risk limitations …. Leading to a suitable augmentation cycle being identified – typically 10-15 years

6. A balanced risk philosophy Cost of new or standby infrastructure versus risk of failure to supply? Effects of installing all augmentation infrastructure now, intended to supply peak day only in 15 years time? Effects of system storage capacity Demand growth uncertainty Loss of skills Supplier reliability

7. Infrastructure availability philosophy Traditional planning criteria for plant availability: 10 to 15 year augmentation cycle, depending on risk 80% availability for pumps at peak day (20% standby) 100% availability for civil structures at peak day (currently) Pumping station can supply peak week demand, using reservoir balancing storage to compensate peak day In the earlier part of the augmentation cycle, the balancing capacity can be used for improving energy efficiency

8. Infrastructure availability philosophy Criteria for civil structures : Pipeline leaks fixed within 24 hours Reservoirs hold emergency storage to maintain supply while repairing pipelines. Major customers also maintain reservoir storage capacity. Reservoirs hold balancing storage for peak periods Cleaning and repairs to reservoirs, sedimentation tanks, filter blocks, etc during low demand season. Primary reason to reduce civil structure availability to 90% (10% standby)

9. Seasonal demand variation

11. The bigger picture:Projected peak day demands to 2035

14. Identifying infrastructure upgrades Demand data is entered in a network computer model represents currently installed infrastructure The period before, during and after peak day is analysed Shortfalls in infrastructure are identified, based on flow, pressure or other risk criteria The computer model is updated to meet demands by placing adequate infrastructure (pipes, pumps, reservoirs) Economic analyses are performed to determine optimal infrastructure size and to verify augmentation cycle suitability

17. The bigger picture:Projected peak day demands to 2035

18. Zuikerbosch Augmentation New 1200 Ml/d capacity system 5 – phase 1 by 2015 Engine room 5 – 1600 Ml/d installed capacity Filter block – 1200 Ml/d capacity Sedimentation system – 1400 Ml/d installed capacity Flocculation system – 1400 Ml/d installed capacity Raw water supply, dosing, power supply, I & C, etc New pipeline to Palmiet by 2013 (2008 AIDR) Cross connection to Mapleton system at Slangfontein New pipeline to Slangfontein by 2017 (Mapleton)

19. Vereeniging Upgrade Complete filter block upgrades Complete steam replacement project Duplicate B11 raw water pipeline Upgrade outgoing pipelines to Daleside / Zk Investigate treatment of return flows Remove bottlenecks to achieve 1400MLD from Vereeniging

20. Palmiet Pumping Station Additional pumping capacity by 2015 Engine Room 3b Augment Palmiet – Klipfontein route by 2015/2017 Augment Klipfontein – Brakfontein route by 2016 Upgrade electrics, disinfection, water hammer protection Additional suction reservoir

21. Mapleton Pumping Station Additional pumping capacity by 2016 Augment Van Dyk – Vlakfontein route by 2015 Augment Vlakfontein – Mamelodi route (in progress) Upgrade electrics, disinfection, etc

22. Zwartkopjes Pumping Station 800 Ml/d available capacity for primary demands 1100 Ml/d available capacity to allow for support to adjacent systems for operational flexibility Electrical upgrade Supply pipelines from Zb & Vg

23. Eikenhof Pumping Station Pumping capacity adequate to beyond 2025 Add reservoir storage capacity to Meredale system Upgrade switchgear

24. Pipeline Renovations – Priority Systems Zwartkopjes – Forest Hill – Yeoville system Zwartkopjes – East Rand system Vereeniging – Daleside – Zwartkopjes system Roodepoort booster delivery system Zuikerbosch – Zwartkopjes system Springs – Heidelberg area All Pre-stressed Concrete pipelines renovated

26. Questions ?