Water is the most valuable product of nature. It is, therefore, the present need of the society that more and more people become aware about various aspects of water. with this in view, the present book is designed to deal rigorously with the present day technology and developments in various technologies of the subject ranging from sources of water, its management and treatment to all aspects of water pollution and its control. Both the fundamental and applied aspects of the subject are covered in a lucid manner suitable for good engineering practice. The enormous information provided would serve the curious who are interested in the depth of the subject and the pragmatic who prefer to get on with their job based upon the data provided.