1. 2015/07/07 Dr Danie Nel Pr Eng 1 WATER SUPPLY RISKS

2. 2015/07/07 2 Overview Water supply Water supply system components The risk concept Probabilities impacting on water supply Consequential damage Why is it important?

3. 2015/07/07 3 Water supply Water supply can be facilitated in a number of ways Source Bulk water supply system Distribution system Consumers On-site systems

4. 2015/07/07 4 Water supply system components Diverse, but lets consider: Reservoirs Pumps Power supply Pipelines Valves

5. 2015/07/07Prof. W. van Wijck/US 5 The risk concept Risk = (Probability of failure) * (consequence of such failure)

6. 2015/07/07 6 Probabilities impacting on water supply Things going wrong and the uncertainties associated with it, for example: Pipeline failures –How often does it happen –How long does it take to repair Power failures Local soil conditions – dolomitic areas Water demand

7. 2015/07/07 7 Consequential damage Vary diverse, but also unique, for example: Type of consumer Area where the incidence occurred. Climate Sanitation services provided

8. 2015/07/07 8 Why is it important? System failures do occur. Impact on people / consumers. Reliability of supply. Impacting on new infrastructure. Impact on repair and maintenance work.

9. 2015/07/07 9 THANK YOU