The earlier fifth editions of the book have received immensely encouraging response from the students as well as the teachers. This has enabled bringing out of the sixth edition of the book so soon. While the main objectives of the fifth edition are identical with those of the fourth edition, the book has been thoroughly revised and several new articles have been added. The subject matter has been presented in a simple language. The basic principles involved in the design of various irrigation works have been thoroughly explained. The book covers the complete syllabii of this subject for the students studying at first degree course of the various Indian universities. Some advanced topics included in the book will be useful for the students studying at the post graduate level.