Two of the main concerns in respect of water supply systems are their efficiency and their reliability, which are fully discussed in the present book, grouped into five sections: 1. Fundamentals. 2. Leakage Detection in Networks. 3. Network Management: Leakage Control. 4. Managing Water Distribution Systems to Reduce Energy Costs. 5. Reliability, Risk Analysis and Rehabilitation. A well balanced approach has been achieved by inviting contributors from academia as well as consultancies and water supply companies. Audience: Water supply engineers in companies and consultancies, civil engineers interested in water supply systems. This book can also be used in courses on efficiency and reliability of water supply systems.