Omar Ashraf Nimr

1 Introduction Due to the inherent complexity of environmental systems and the hydrological cycle, hydrological analyses are subject to unavoidable uncertainty, and hydrology has therefore been described by some as an “inexact science” (Beven, 2019). Major sources of uncertainty arise from system closure, boundary conditions, process representations, parameterizations, and observables (Beven & Young, 2013; Di Baldassarre et al., 2016; Song et al., 2015).