The hydrogeologic unit UH2 (Miocene Aquifer) supports a great amount groundwater abstractions and it
is hydraulically connected to the Jucar river. Water withdrawal for irrigation purposes has driven to a
regional groundwater level lowering which affects not only the river-aquifer system but probably the
evolution and the status of the river ecosystems as well. Transmissivity is one of the main factors that
control the interactions between groundwater and surface water bodies. In this work, the spatial distribution
of transmissivity is analysed by means the use of geostatistical and GIS tools. This hydraulic parameter is
studied in combination with the spatial variation of the saturated aquifer thickness. A non-linear relationship
is found between transmissivity and saturated thickness as conconsequence of differences in the development
of karstification in the UH2