Rainfall and Runoff

Rainfall and Runoff

Rainfall and Runoff

Rainfall and Runoff

Excerpt

The purpose that motivated the preparation of this book was two-fold. It was desired to present a reasonably complete picture of the science of hydrology as related to rainfall and runoff, including the more important and well-established principles that have been developed within the past two decades. Second, it was intended to introduce into hydrological practice the use of the methods of statistical analysis. In the combination of these two objectives it is hoped to put the science of hydrology on a logical basis by eliminating guesswork as much as possible, by setting limits within which judgment may be exercised safely, and by introducing means of measuring the numerous variations observed in the occurrence of water in nature.

Developments in the field of hydrology have multiplied tremendously within the past 15 to 20 years, and since these developments have been reported chiefly in current periodicals, it appears justifiable to bring them together in one volume. They have been reported to the public through the publications of many organizations, such as the American Society of Civil Engineers, the American Meteorological Society, the American Geophysical Union, and in many special publications by different agencies interested in hydrological work. These publications represent the widely scattered interests and activities of the investigators.

The use of statistical methods has likewise been developed and extended greatly within the last two decades. It has been used to facilitate research in many fields, such as business, agriculture, and biological work. The theory of probability has been utilized in studying the turbulence of water, thus bringing statistics into a field that has been especially applicable to analysis by methods of exact mathematics. Although a few engineers have adopted in some degree the methods of statistical procedure to determine flood frequencies, the profession as . . .

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