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There has been little exploration of the explicit simulation of the set ofoptions of actors in agent-based models and its evolution over time. This studyproposes to use affordances as intermediate entities between agents'environment and agent actions. We illustrated the approach on a typicalgravity-fed network in the South-East of France to explore how the abandonmentof traditional sharing of water changes the irrigators' options to irrigate. Wesimulated a typical dry year irrigation season under two institutionalarrangements (i.e. traditional coordination through daily slots and itsabandonment). Simulation results are consistent with field surveys, and revealan increase in the number of internal conflicts among irrigators as thecounterpart of the abandonment of traditional sharing of water. They alsohighlight the consequences of the heterogeneity of the irrigators' interestswithin the collective institution. The sensitivity analysis of the modelallowed identification of optimal modalities of coordination, and a potentialcompromise between past and current institutional arrangements. The keybenefits of using affordances in ABM lie in the study of their populationdynamics for characterizing the interaction situations between actors and theirenvironment and for better understanding the model dynamics.

A situated agent-based model to reveal irrigators' options behind their actions under institutional arrangements in Southern France