Theme 3-1-Risk management to improve raw water quality

Abstract

This paper identifies methods that can be used by water supply managers to assess and manage the risks associated with raw water quality. The process begins with risk assessment, a tool used for assessing the sources of pollution risk and prioritising tasks for management. Techniques for risk assessment are discussed, including catchment surveys and developing priority rankings for the risks and various sources. Risk assessment provides the information base for the consideration of risk management options, such as improved catchment planning and better dam management. A brief case study of the activities of the Lyonnaise des Eaux group in Malaysia illustrates the use of applied RA and RM techniques for the improvement of raw water quality prior to water treatment. The importance of managing pollution upstream of the treatment plant is noted as a cost effective way of ensuring higher quality treated drinking water.