Environmental engineering is the creation of infrastructure and procedures for waste disposal, water supply, and pollution control. It is a broad field that incorporates hydrology, geology, microbiology, chemistry, mathematics, ecology, hydraulics and economics. Hydrology refers to the study of water cycling through various reservoirs on the Earth. It focuses on the effects of climate on the water cycle and the distribution of water in the atmosphere, subsurface and surface. It also studies the chemistry of water from different sources. The vast majority of hydrologic applications involve surface water systems such as estuaries, rivers, and open-channels. Geographically, the study of hydrology is divided into three areas, namely, surface water hydrology, groundwater hydrology (hydrogeology), and marine hydrology. Some of the major areas of study within hydrology are hydrogeology, hydrometeorology, drainage-basin management, water quality and surface hydrology. This book contains some path-breaking studies in the field of hydrology and environmental engineering. It consists of contributions made by international experts. Scientists and students actively engaged in these fields will find this book full of crucial and unexplored concepts.