An analytical construct of social capital is presented, followed by a case study from Sri Lanka. There, farmer organizations were established in the Gal Oya irrigation scheme in the early 1980s with a combination of roles, rules, norms and values that supported mutually beneficial collective action. This produced measurable improvements in system performance and efficiency. In the 1997 dry season, after farmers were told there was not enough water in the reservoir to grow a rice crop, they achieved through their organizations a better-than-average harvest from 65,000 acres by efficient and equitable distribution. Ethnic cooperation was demonstrated by upstream Sinhalese farmers sharing water with downstream Tamil farmers.
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Uphoff et al. (2000) studied this question.