The historical impacts of hydroelectric power development on traditional mountain irrigation in the Valais

This article examines the physical and socioeconomic impact of HEP development on the bisse irrigation system in the Valais, Switzerland, and discusses new water resource issues, conflicts, adaptations, and innovative responses. The study shows that a two- to three-tier consultation process has led to communes and autonomous collective irrigation institutions (consortages) signing and ratifying long-term conventions that ceded water to HEP companies at the scale of watersheds. Water supplies for irrigation are protected by these conventions at the same time as changed hydrological regimes improve water security in economically viable bisses. Conventions also improved the economic security of some consortages, while at the level of individual households, HEP development allowed diversification of income generation strategies.

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