Mountain regions are important water towers for a significant part of the world’s population. In Europe, the Rhine, the Po and the Rhôe rivers flow from the Alps, which comprise 15% to 35% of their basin areas, but contribute 30% to 50% of their total annual discharge (Viviroli & Weingartner, (2004). Climate change is expected to have significant impact in mountain regions, both due to increasing temperatures and changing precipitation patterns (IPCC, (2007).