Abstract
Let Tn be the time of occurrence of the nth flood peak in a hydrological system and Xn the amount by which the peak exceeds a base level. We assume that ((Tn, Xn)) is a Poisson random measure with mean measure μ(dx) K(x, dy). In this note we characterize two extreme value processes which are functionals of ((Tn, Xn)). The set-parameterized process {MA} defined by MA = sup {Xn:TnA} is additive and we compute its one-dimensional distributions explicitly. The process (Mt), where Mt = sup{Xn: Tnt}, is a non-homogeneous strong Markov process. Our results extend but computationally simplify those of previous models.

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