The book explains the basic concepts of river water quality index, river environments, shifting of river courses, dams and barrages – their merits and demerits, mutual interdependence of river and society etc. in the typical geomorphic set up of West Bengal. In India, West Bengal is a riverine state due to the towering Himalayas to the north and the Bay of Bengal to the south. In between the mountain and sea, due to the location of the Gangetic delta region and its stability with space and time, the rivers of this state are gradually dying. In addition to the stability of the delta, the river channel is being filled with sediments carried along the river course from upstream. The role of dams, barrages and reservoirs in the normal flow of rivers at different geographical locations deserves discussion which is included in the book. It is to be expected that the rivers of West Bengal can be an outstanding example of mutual interdependence of science and society, all of which are included in the book. The use of different physicochemical parameters adopted for the water quality index of different rivers described in this book will provide new directions in this regard. With discussions like water quality index, river environments, shifting of river courses, reservoirs, dams and barrages, and mutual interdependence of river and society, it is the intention that this book, River Systems of West Bengal - Water and Environments, will be useful for the research and higher studies in the river related field. This book will be of interest to students and researchers of riverine environments.