“…Some procedures consider the peak flow rate and the volume of the flood on a joint basis, applying bivariate distribution functions (Hiemstra and Francis 1979, Yue et al 1999, Domínguez 2000, Ramírez-Aldama 2000, Jiménez 2000, Aldama and Ramírez 2002, Escalante-Sandoval 2007, and the use of copulas for the multivariate flood analysis has been recently applied (Favre et al 2004, Grimaldi and Serinaldi 2006, Shiau et al 2006, Genest et al 2007), but they have some differences in the definition of the most suitable region for the integration of the bivariate distributions, the inherent subjectivity in the estimation of the duration of the floods and, therefore, the volume of the maximum historical floods, the shape of the design flood, etc.…”