This book discusses important issues related to water pollution which holds significant concern globally. Water is an essential natural resource which plays a key role in the ecological system. Human use of water is based upon ambient water quality, and human alterations of the land use adversely affect the water quality. Water is commonly referred to as polluted when its quality is unfavorably affected by contaminants and undergoes a marked shift in its ability to support the biological communities. The book caters to the needs of research scholars, hydrologists and environmentalists and especially, students.