this book does not require any introduction now. we thank our readers for entitling the book as best book ever written on “ hydraulics & fluid Mechanics” Unlike other books the idea of the author was to clear the basic principles of & the student making it a professional choice The book in this seventeenth edition is entirely in SI Units and it has been thoroughly revised in the light of the valuable suggestions received from the learned professors and the students of the various Universities. Accordingly several new articles have been added. The answers of all the illustrative examples and the problems have been checked and corrected. Moreover, several new problems from the latest question papers of the different Universities as well as competitive examinations have been incorporated. Thus it may be emphatically stated that the book is complete in all respects and it covers the entire syllabus in this subject for degree students in the different branches of engineering for almost all the Universities. Therefore this Single Book fulfills the entire needs of the students intending to appear at the various University Examinations and also for those intending to appear at the various competitive examinations such as engineering services and the ICS examinations and for those preparing for AMIE examinations. Unlike other books this book clears the basic principles of the reader.