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Irrigation systems are a common pool resource. When farmers fail to internalize the cost of their use on others, the allocation of water within the irrigation scheme may not only be inefficient but also affect water availability in the long term. Collective action over the management of a scheme is then necessary to ensure the sustainability of irrigation supply. Decentralized models of governance have evolved to formalize the delivery of water resources (Ostrom, 1990; Ostrom and Schlager, 1992). Yet, local institutions like water user associations may not yield efficient resource sharing if the main constraint users face is limited knowledge of water management (Plusquellec, 2002; Meinzen-Dick, 2007).