The Sapienza unit will deal with groundwater modeling of flow and transport, a data basis necessary for reaching many of the goals of NINFA, included in WP1, WP2, WP3 and WP4. Previous international experiences, including H2020 and PRIMA projects, ensure the contribution of Sapienza as significant for the correct development of the project. Clustering with other projects and dissemination in water and groundwater research communities will be additional contributions.