The continuous Hydrogeological Map of Spain in digital format at a scale of 1:200,000 is based on the Lithostratigraphic and Permeability Map of Spain, continuous at a scale of 1:200,000 and represents the mapped lithostratigraphic levels, grouped by range of permeability and the associated lithologies, and represented with a certain colour and tone, so that it is possible to visualise the areas associated with the different aquifers on the map. Blue colours represent porous aquifers, green colours represent fissured or karstic aquifers and brown colours represent impermeable or low permeability formations. Productivity is represented by the tone, in the case of permeable formations, dark tones indicate greater productivity and in the case of impermeable formations indicate greater impermeability. For the preparation of the Hydrogeological Map, once it had been verified that the formations that make up the main aquifers were cartographically differentiated on the Lithostratigraphic and Permeability Map of Spain, a hydrogeological legend was drawn up, grouping them according to their permeability, geometry, hydraulic relationship and hydrogeological functioning. This work was carried out taking into account the existing information on the different aquifers in Spain as well as the groundwater bodies defined in accordance with the Water Framework Directive (WFD). The continuous Hydrogeological Map of Spain in digital format at a scale of 1:200,000,000 arises from the need for a continuous map of the entire national territory on which to capture the information and distribution of the groundwater bodies (m.a.s). This cartography is adapted to the hydrographic network and the shadow model made by CEDEX, at a scale of 1:20,000, from the topographic base, at a scale of 1:50,000, of the Army Cartographic Service. The cartographic information is referenced to coordinates in UTM projection, European Datum, zone 30, except for the Canary Islands, which is referenced to zone 28. The Hydrogeological Map is made up of a polygonal layer of cartographic units (LPLIT) and the external tables Hidro.dat and Descrip_hidro.dat. The format of the information generated is Shape file.
