MEDITATE aims at the development of a water management support system at the Mediterranean catchments level, integrating the use of alternative water resources such as karts submarine springs, seawater or brackish water desalination and water reuse, for water scarcity management. Innovative technologies for submarine springs, from survey using an autonomous underwater vehicle, monitoring at the spring level till capture prototype, will be developed mainly in this project. Economical and environmental study of submarine springs will be conducted and taken into consideration. Submarine springs study will also be used to determine the real water resource potential at the coastal karts aquifers in three Mediterranean catchments. The submarine springs could represent important alternative water resource as it has been reported during the last 30 years, but without serious scientific arguments. New technology for characterising the submarine springs will help to infirm or confirm this hypothesis. Low cost and low energy desalination plants for temporary use and salinity variability of submarine springs water will not be developed within MEDITATE, but designed based unfeasibility analysis. A general analysis of desalination cost for various conditions will be taken into account in the socio-economic analysis for the management system. In the same manner, a review of water reuse will be carried out, taking into consideration environmental and health problems, technical and cost problems in order to have serious data to be considered in water management scenarios. The water management support system will bring stakeholders in a decision-making process considering water visions for 2025. The WMSS will provide set of scenarios, giving safe water yield, based on the characterisation and hydrological modelling of four catchments. This WMSS will allow integrating different types of knowledge inclusive all social actors, in a decision-making process.