This book incorporates the extensive and updated basic definitions on the subject authored by the scientists of international repute to understand the various concepts. This book presents latest comprehensive and authoritative explanation through different angles of basic terminologies in irrigation, drainage, hydrology, climatology and watershed management. Authors have made efforts to cover all the terminologies with definitions in scientific and easy language. In their endeavour to make the basic concepts of subject simple, they are trying to reach the academicians, scientists and research scholars. This book is being published to vent the authors desire of serving the profession. We hope this book will satisfy the many aspirants from the diversified fields related to soil and water. Special Features l A valuable reference book for practicing professionals in soil and water management. L Along with the definitions, suitable illustrations and examples are also included so as to make easy understanding of the subject matter. L A universal approach has been adopted in developing the manuscript. L A comprehensive book for undergraduate students of agricultural engineering and an invaluable reference to post graduate students as well as practicing engineers specializing in the fields of soil and water.