Abstract
This paper discusses some common hydrologic problems in the statistical treatment of flood series associated with the calculation of flood frequency. These problems are: (1) the assumptions used in flood frequency estimation; (2) the moment method and the moment-calculation error; (3) the application of the empirical frequency formula to extraordinary floods; (4) individual curve fitting method; (5) sampling error; (6) computation of combined frequencies; and (7) frequency estimation in the presence of zeros in the series. In addition, other problems, such as the accuracy of statistical calculations, the combination of hydrologic events and the reasonableness of derived results, are discussed.
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