A mathematical formulation within various types of uncertainty can be properly characterizes and investigated is now available in terms of the theory of the fuzzy sets and fuzzy measures. Understanding these various types of uncertainty and their relationship with information and complexity the fuzzy set theory is successfully applied in Hydraulic systems with critical characteristics. This book imparts latest development in application of fuzzy dimensional analysis method and fuzzy interval algebraic operation as explicit form of Extension principle of Max-Min principle of Zadeh (1965). It deals with the possibilistic criteria of problems in Boundary-layer theory and introduced some aspects of solution of problems in Hydraulic system by the tools of fuzzy sets and systems, where fuzziness of the variables are taken in to account a priori. This book is aimed at providing expert systems with computational promise in critical problems of advanced fluid dynamics. It is very essential for researcher of Computational fluid, Thermal fluid and students of MHD, Physical chemistry and Engineering research.