Water auditing is a method of quantifying water flows and quality in simple or complex systems, with a view to reducing water usage and often saving money on otherwise unnecessary water use. There is an increasing awareness around the globe of the centrality of water to our lives. This awareness crosses political and social boundaries. In many places people have difficult access to drinking water. Often it is polluted. Water auditing is a mechanism for conserving water, which will grow in significance in the future as demand for water increases. There is a strong emphasis on principles, and on the relationship of water auditing with associated activities like environmental auditing, environmental management systems, resource conservation, flow measurement, water quality and legal frameworks. Field experience from professionals is integrated with the theoretical material and the book outlines the processes and issues at stake in a variety of typical applications (arenas) in which water auditing are conducted. These include buildings (interior and exterior), landscape, external commercial applications requiring irrigation, aquatic centres, material transport by water, cooling systems and non-metal manufacturing (e.g. paper manufacture). This new edition is updated with recent information and particularly examines the impact of climate change and revises material throughout on environmental auditing. The relationship between water accounting and financial accounting is introduced and advances in ultrasonic measurement, smart meters, wireless data transmission and remote monitoring are added. Changes and trends in legislation for water conservation and water reuse are included and also the use of smart meters to interpret water consumption data including leak detection. Three of the cha