This was published in the fall of 1951. Since then there have been a number of significant new projects in the field of water engineering- the Aswan Dam project, the French Rhone River development, etc. And the use of water is expanding with the growth of cities. This brings a lively text up to date, keeping the excellent background material on what water means to life, how it was harnessed, and the problems created in modern life. Good popular science for use in social studies.