The scientific study of the movement, distribution and quality of water on earth and other planets is known as hydrology. The area of land where precipitation collects and drains off into any common outlet such as a river or bay is known as catchment. It includes all the surface water from rain runoff, groundwater and snowmelt. The catchment is the most significant factor in determining the amount or likelihood of flooding. Catchment hydrology primarily focuses on the study of drainage basins with respect to hydrology. It is based on the principle of continuity, which is used to perform a water balance on a catchment. This book provides comprehensive insights into the field of catchment hydrology. It traces the progress of this field and highlights some of its key concepts and applications. The topics covered in this book offer the readers new insights in this domain.