Hydrometeorology is a branch of meteorology which focuses on the problems related to water cycle and water budget as well as the rainfall statistics. It also encompasses climatology, hydrology, cloud physics and weather forecasting. Primarily, it is concerned with mitigating the risks of flood and other hydrological threats. It utilizes the data recorded regarding various hydrological processes and observes the risks of natural disasters such as drought, desertification and cyclones on the basis of that data. It also focuses on the transfer of water and energy between the land surface and the lower atmosphere. Hydrometeorology also focuses on water quality and supply. This book outlines the processes and applications of hydrometeorology in detail. It elucidates the concepts and innovative models around prospective developments with respect to this field. Through this book, we attempt to further enlighten the readers about the new concepts in this area.