Resumen
This paper analyses the joint planning process the Jucar and Turia rivers regulation, in order to identify the causes of the most significant technical errors. The planning process started during the Primo de Rivera dictatorship, but the definitive proposals were settled after the Civil War, in 1955, in the Júcar and Turia Regulation Project. These plans, never accepted by local stakeholders and economic agents, completely ignored the potential of groundwater resources and failed in the assessment of water resources, causing the over-dimensioning of some critical infrastructures.
