23-04-19 Dr Danie Nel Pr Eng 1

WATER SUPPLY RISKS

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Overview

• Water supply

• Water supply system components

• The risk concept

• Probabilities impacting on water supply

• Consequential damage

• Why is it important?

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Water supply

Water supply can be facilitated in a

number of ways

• Source

• Bulk water supply system

• Distribution system

• Consumers

• On-site systems

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Water supply system components

Diverse, but lets consider:

• Reservoirs

• Pumps

• Power supply

• Pipelines

• Valves

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The risk concept

Risk = (Probability of failure) *

(consequence of such failure)

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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

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Consequential damage

Vary diverse, but also unique, for example:

• Type of consumer

• Area where the incidence occurred.

• Climate

• Sanitation services provided

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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.

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THANK YOU