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The objective of this work is to show the procedure used to develop the vulnerability map to the contamination of two important aquifer horizons, constituted by karstic stratum waters, in the southern western Cuba. The method of quantification of vulnerability is based on the electrical conductivity of the surface layers, through the use of indicators deduced by Kalinski, Röttger and others. The map shows that the vulnerability to pollution is high at the western end of the region, while for the main aquifer, associated with the Miocene limestones of the Paso Real formation, the vulnerability is mostly medium. [ABSTRACT FROM AUTHOR]

Aquifers vulnerability maps allow differentiating the natural characteristics of the geological environment to protect the aquifer from the action of multiple pollutants that can infiltrate from the surface, associated to natural phenomena or to man's activity. This paper evaluates the natural vulnerability and risk of contamination of the Cuenca Dolores - Sagua La Chica, located northeast of Villa Clara, Cuba. The PATHS methodology is applied, which values aquifers vulnerability analyzing: Precipitations and groundwater level, Aquifer, Tectonic and Topography of the land and Soil Hydraulic Conductivity. As a final result the Map of Vulnerability and the Map of Contamination Risk are obtained for the basin at a scale of 1:100 000. [ABSTRACT FROM AUTHOR]