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Application of advances in flood frequency analysis
- Reich, B.M., Renard, K.G.
- Water resources bulletin 1981 v.17 no.1 pp. 67
- floods, frequency, computer analysis, ephemeral streams, runoff, Weibull statistics, equations, probability analysis, paper, sampling, problem solving, Arizona
- Flood frequency analyses are frequently being made using widely available computer programs. Serious errors can result from blind acceptance of such results. Visual interpretation of observed flood series can be used for evaluation on frequency paper with compatible scales. Such frequency papers are presented in the paper. In ephemeral streams, more infrequent floods may constitute a separate set from the more frequent floods because (a) runoff producing storms cover only a portion of the contributing area, (b) transmission losses in the normally dry streambed may reduce the peak flow, and (c) some runoff may be stored in stock water ponds which therefore leads to partial area runoff. The Cunnane plotting position used in this paper is superior to the more widely used Weibull equation, having a mathematically sound basis for locating observed floods on an assumed probability.