This book Irrigation Drainage Engineering is intended to be a book in the area of irrigation and drainage for the students of agricultural engineering. This book will also be useful for agricultural extension workers and the professional working in this area.The contents of the book may enable one to acquire some basic requirements which an irrigation and drainage manager must have. The contents include basics along with some information toward research achievements, importance and usefulness so that the students get interested to the subject and at the same time help them to attend the institutional and competitive examinations.The book contains good numbers of numerical as example and task to get the students familiar to the requirements, complicacies, and possible remedies in actual working condition. Excepting the traditional broad and short questions multiple choice questions are also set in every chapter.The second edition of this book is developed after looking the interest of the students and other users good numbers of numerical analysis particularly the GATE questions of Agricultural Engineering, a new chapter by the name Groundwater Hydraulics Wells and the topic Grassed Waterways have been included. Hopefully, these will help to get the book more useful.