In this proposal, an integrated approach combining advanced computational tools (numerical modelling and optimisation) and GIS, will be developed for sustainable water resources management in Mediterranean coastal aquifers. Particular emphasis will be devoted to artificial recharge (including wastewater reuse). Six field sites are selected in for demonstration, validation and assessment purposes. Data sets are first collected and embodied within a geographic information system for easy access and search, visualisation and thematic map production. 3D Numerical models for groundwater flow, seawater intrusion and Optimisation procedures are developed and implemented. The tools are then applied for investigating field sites Southward and Northward. Scenarios varying recharge location and storage capacity are simulated to assess the best control of seawater intrusion and meeting demand requirements.