Flood Frequency Analysis Using the Gamma Family Probability Distributions

This article presents six probability distributions from the gamma family with three parameters for flood frequency analysis in hydrology. The choice of statistical was driven by its frequent use In Faculty Hydrotechnics, improvement estimation maximum flows, including methodological bases realization a regionalization study linear moments method corrected parameters, researched and is an element novelty. performs better than ordinary because it avoids skewness depending on origin practiced Romania. L-moments conforms to current trend estimating distributions. Observed data hydrometric stations are relatively short length, so that characterize them sample requires correction. correction proposed using least squares based inverse functions expressed factor L-moments. All necessary elements their presented, such as quantile functions, exact approximate relations factors. A case carried out Ialomita river verify methodology. performance this evaluated Kling–Gupta Nash–Sutcliff coefficients.