Reservoirs are increasingly deemed to be important given their potential control of water availability across seasons, from wet to dry seasons, especially given the concerns on the effect of climate change. In this paper, we assess the potential scope for policy intervention on the construction of irrigation reservoirs and its design, focusing on the collective action aspect. We formulate a theoretical model in which farmers pool resources to construct a collective reservoir. We conceptualized the reservoir as a “blue club” that increases the potential water availability in dry season, thus improving water safety for the whole society. We determine the societal potential inefficiency in club size and the policy measures to correct it, focusing on two different club access rules (open vs closed membership). Results show that linear subsidy are ineffective in case of closed membership, and minimum participation rules are required to increase the club size.

考虑到水库在整个季节（从潮湿到干燥的季节）对水的可利用性的潜在控制，尤其是考虑到对气候变化的影响，水库被越来越重要。在本文中，我们集中在集体行动方面，评估了对灌溉水库建设及其设计进行政策干预的潜在范围。我们建立了一个理论模型，在该模型中，农民汇集资源以建立集体水库。我们将水库概念化为“蓝色俱乐部”，可以增加干旱季节的潜在水供应，从而改善整个社会的水安全。我们以两种不同的俱乐部准入规则（开放式与封闭式会员制）为重点，确定了俱乐部规模上的潜在社会低效率及其纠正措施。