This book is designed to meet the special , but not exclusive, needs of civil engineering students reading for degrees and diplomas and for engineering. Having as its main feature a substantial number of worked examples , its purpose is to augment lecture courses and lectures on fluid mechanics and hydraulics by illustrating the theory to a wide range of practical situations . A fluid is a substance which deforms continously, or flows, when subjected to shear stresses . the term fluid embraces both gases and liquids; a given mass of liquid will occupy a definite volume whereas a gas will fill its container. gases are readily compressible; the low compressibility, or elastic volumetric deformation, of liquids is generally neglected in computations except those relating to large depths in the oceans and in pressure transients in pipelines. This book however deals exclusively with liquids and more particularly with Newtonian liquids , i.e. those having a linear relationship between shear stress and rate of deformation.