The book, composed in a straightforward and lucid style, is meant to benefit students who lack prior knowledge and exposure to the subject matter. It offers a wealth of fundamental information on hydrology. In each chapter, the book presents various sample calculations that facilitate students comprehension of the subject matter with ease. The books chapters are meticulously organized, systematic, and based on class notes created for students, as well as the extensive practical field experience of the authors. This book will be of great assistance to students pursuing studies in Meteorology, forestry, environmental engineering, geology, and earth sciences. In addition to serving as a textbook, the book is also intended to be a valuable resource for individuals working in agriculture, agricultural and civil engineering. It will be a vital asset for all academicians, planners, designers, practicing and field engineers involved in water resources evaluation, development, and management, as it contains 102 sample calculations, 105 tables, 154 figures, more than 145 references, and various field experimental results.