Abstract
In this chapter, we present an overview and the basics of hydrological frequency analysis (HFA). We start first by describing the general aims and goals of HFA as well as the essential notions of return period and quantile for hydrological risk assessment. Then, we briefly introduce the main steps to perform the whole HFA and refer to the corresponding chapter where each step is they are fully presented. We cover the advantages and challenges when passing from univariate to multivariate HFA frameworks, especially using copula function. We describe Tthe multivariate character of a number of hydrological phenomena, such as droughts, rainfall storms, and sediments, as well as their main features to be treated in the multivariate HFA framework.
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