A river catchment is an area of land where the rainwater collects. Catchment management requires managing all the components of the hydrological cycle that operate within a catchment. Reservoirs are artificial or natural lakes that are used as a source of water supply. River catchments and reservoirs play a critical role in ensuring water security, community wellbeing, and socio-economic prosperity. In many parts of the world, the reservoirs are under increasing pressure to meet the challenges from population growth, economic activities, and changing climates. Water resource management refers to the activity of developing, planning, distributing and managing all such water resources efficiently. This book is a valuable compilation of topics, ranging from the basic to the most complex advancements in catchment and water resources management. It is appropriate for students seeking detailed information in this area as well as for experts.