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The basic principles of the duration curve are reviewed in this paper in such a manner as to outline the various ways in which it is properly used in hydrologic analyses. Some of the details and differentiations discussed are of small significance compared to inaccuracies existing in the greater part of the hydrologic data available today. However, the proper use of the duration curve is essential to a fundamental understanding of statistical analysis and, since proper use is no more difficult than improper use, the differentiations are deemed relevant from an engineering standpoint.
Leo R. Beard (Fri,) studied this question.