Water resources are natural sources of water that are beneficial for human beings. Water is used for various purposes such as irrigation and drinking. Frozen water, surface water, groundwater and under river flow are examples of natural sources of fresh water. Climate change, water scarcity, water conflict, and water pollution, all pose a threat to the available water resources. Daily water security of the society can be affected by various climate change factors, such as melting of glaciers, severe droughts, heavy precipitation, and the magnitude and frequency of floods. The availability of subsurface and surficial water is also affected by factors such as climate change, and regional and global water cycles. This book contains some path-breaking studies on the impact of climate change on water resources. It will serve as a reference to a broad spectrum of readers.