ABSTRACT
Thirriot (1994) concluded this list as follows: “Five arbitraries to arrive at an objective result! One must confess that the field is ripe for controversy. Fortunately, the results of the different paths are often not far apart with regards to the uncertainty governing the initial measurement or estimation. And then there are the schools of thought – or the habits - or conventions. Because we are well aware that, even if in many ways we are not absolutely certain that the result will be the best one, we have to do something and the imprecision will be minimal in comparison to the hazard. The 100-year return period flood could be next year or a thousand years away. So … ?” Miquel (1984, page 148), meanwhile, described three categories of uncertainties: • The information: discrepancies in standard measurements
(instantaneous discharge, discharge rating curves, rating curve shifts, etc.); discrepancies in the estimation discharges of extreme flood; lack of comprehensiveness.
