However, the number of hydrometrical stations monitoring a basin's hydrological behaviour worldwide has become reduced Vörösmarty et al., 1999; Espinoza, 2009.
Sin embargo, la disminución de estaciones hidrométricas que permiten monitorear el comportamiento hidrológico de una cuenca es mundial Vörösmarty et al., 1999; Espinoza, 2009.