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While archives are common in developed countries, it is generally recognised that they are lacking in developing countries. To cope with the challenges faced by a 500-year-old water irrigation system in a semi-arid region in the south of Morocco, we demonstrate that the absence of archives invites methodological exploration, making the invention of new sources, especially visuals, inevitable. They serve as mnemonic devices for keeping track of community water management infrastructures. Documenting actors’ reconstruction of organisational memory reveals new memory categories: communal, community-based, common, and historicised memory. Inspired by the eight principles of Ostrom’s theory on the commons, our case study also shows that the governance of commons cannot last beyond one generation without a process of organisational re-membering. Organisational re-membering, as the ninth principle of the commons theory, induces memory as well as a renewed community membership.