This updated edition offers an essentially practical introduction to hydrology, emphasizing the application of hydrological knowledge to the solution of engineering problems. Set in a global context, hydrological extremes are taken from worldwide situations and examples of engineering applications from many countries are cited. Hydrological processes, with emphasis on methods of measurement, are separated from analytical techniques and the book culminates in a selection of civil engineering spheres of operation requiring hydrological expertise, demonstrating some of the well tried methods and some of the new techniques applied in current practice. SI units are used throughout, but when non-standard units are used for convenience in practice these are retained, and certain comparisons with imperial units have been included.