The relationship between extreme rainfall depths and flood volumes under the assumption of exponentally-taildd probability distributions

摘要

The fact that precipitation records are in many instances longer. more accurate, and more readily regionalized than flood discharge records has motivated the development of methodologies for incorporating the hydrometeorological information into flood frequency anlaysis. In particular, those described by Guillot and Duband (1967) and Naghettini et al. (1996) involve assumptions regarding the relationship between rainfall depths and flood volumes under extreme conditions, which are crucial for transferring the hydrometeorological information to flood frequency curves. These assumptions, common to both methodologies, are valid for rainfall probability distributions showing asymptotically exponential-like upper-tails and were introduced by Guillot and Duband (1967), as part of the so-called GRADEX method for flood frequency analysis.