This comprehensive textbook combines the theoretical principles of engineering hydrology together with their practical applications, using modern industry-standard software. The textbook is written by the combination of a practitioner of water resources engineering with over 30 years of professional experience and a highly respected academic and recognized world authority in hydrology. Examples are drawn from global case studies, with exercises available online. The book begins with a review of the necessary mathematics and statistical hydrology. The underlying principles of the geographic information systems are discussed. In addition to topics covering fundamental concepts, separate chapters are devoted to reservoir operations, water resources management, climate change, and various methods of optimizing hydrologic models for calibration and validation. This textbook will prove to be indispensable for advanced students in civil, environmental, and agricultural engineering, preparing them to confidently join the industrial sector. It will also be an indispensable reference textbook for practicing engineers, bringing them up to date with modern techniques in applied hydrology.