The Irrigation System of Campo Montiel, La Mancha region, Spain

Campo de Montiel Irrigation system is based on an aquifer of 2500 km², but only that only 3% of it was used for agriculture. Campo de Montiel is located in La Mancha Region, in Spain. The case study involves an analysis of the evolution of the system from 1980 to 2000. The authors catalogue an action situation involving 29,000 total users that appropriate groundwater as the resource unit from the High Basin of Guadiana River, but only 101 farmers appropriate groundwater for irrigation purposes.

The original case study authors focused on institutions for collective management.  The case study has subsequently been used in comparative analyses regarding Ostrom's Design Principles (see bibliography).