(2012a, 2012b) and in Crochet & Þórarinsdóttir (2014,
2015), different factors can contribute to the development of a poor index flood model, lead-
ing to poor estimates of µ(D) at ungauged catchments. Firstly, the model may be inappropriate
to
describe the spatial variations of µ(D) in the region under study, even though the region is
homogeneous. Secondly, the degree of hydrological similarity
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