Progagation of rating curve uncertainty in design flood estimation

Statistical flood frequency analysis is commonly performed based on a set of annual maximum discharge values which are derived from stage measurements via a stagedischarge rating curve model. However, design flood estimation techniques often ignore the uncertainty in the underlying rating curve model. Using data from seven gauging stations in Norway, we investigate the effect of curve and sample uncertainty on design flood estimation. Accounting for curve uncertainty may strongly influence the results if an extrapolation of the rating curve is necessary.