This book is designed to give an existing state of knowledge in the field of hydrology, irrigation engineering, and hydraulic structures in a brief manner so that students can use it for their own reference from time to time. Compared to other voluminous books available on the subject, the author has tried to cover the important subject matter in an abridged manner in approximately 320 pages. Besides the full explanation of the theoretical aspects with well-illustrated figures, it gives a number of solved numerical examples. Problems for practice are also given with answers at the end of each chapter.