The book has been written in a clear and accessible style, which makes it suitable for students who may not have prior knowledge or experience in the subject. It includes a wealth of basic information about hydrology, and each chapter contains a range of sample calculations that will help students to grasp the material more easily. The books organization is systematic, and its content is based on both class notes prepared for students and the practical field experience of the authors. It will also be useful for students in related fields such as meteorology, forestry, environmental engineering, geology, and earth sciences. In addition to serving as a textbook, the book will be of great value to those working in agriculture, agricultural and civil engineering. It will be a valuable resource for academics, planners, designers, practicing engineers, and field engineers involved in water resources evaluation, development, and management. The book contains a total of 102 sample calculations, 105 tables, and 154 figures, as well as more than 145 references and numerous field experimental results. These features will make the book invaluable to both students and professionals working in the field.