الفهرس 
AbstractOnly 14 pages are availabe for public view
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Abstract
The quality of water whether used for drinking, domestic purposes, food production or recreational purposes has an important impact on health and aquatic ecosystems. Initiatives to manage the safety of water do not only support public health but often promote socioeconomic development. The approach of this work is to promote an understanding of the entire water supply system from source to consumer, including the hazards that can compromise drinking water quality and safety and develops effective measures to assess and manage risks arising from those hazards using spatial and statistical model. Comparative evaluation of certain physical, chemical and biological characteristics of raw, treated and potable water at distribution network has been on going on a monthly basis during the period from January 2010 to December 2015. Applying a GIS tool will provide visual impacts for various hazards using Water Quality Index (WQI), which has formed a series of prediction maps for risk assessment. The results showed that surface water is remarkably influenced by wastewater discharge especially at drought period. After treatment, produced potable water is nontoxic with properties largely coping with standards guidelines. Prediction model proved that it has a practical and economical value that gives an easier and effective solution through selecting the best decisions to enhance water quality. By concentrating on the protection of source water, control of treatment processes, employing multiple barriers and maintaining the integrity of water supply systems, greater assurance of public health protection can be gained and providing a comprehensive preventive strategy for drinking water system management can be achieved.
Key Words: Surface Water, Potable water, GIS, WQI, Risk assessment, El Fayoum.