The index of the vulnerability of the Yucatecan karstic aquifer (IVAKY) is proposed.

The IVAKY was built based on a geomorphopedological map scale of 1:50 000, which contains the density and type of karst depressions and soil associations in each geomorphopedological unit. The climate factor is included through the length of the rainy period that considers amount, distribution and intensity of the rain.

The three factors (topography, soils and climate) were weighted with the process of hierarchical analysis (AHP) using ArcGis.

It was identified that the ring of sinkholes  and part of the northeast of Yucatan state have the extreme level of vulnerability, where dominated sinkholes in contact with the aquifer and soil as Nudilithic Leptosols, Lithic Leptosols and Rendzic Leptosols, occupying 19% of the state surface.

Low and very low levels of vulnerability are located in southern Yucatan in areas of equal or greater than 50 masl, with low to medium density of karstic depressions (uvala and poljes) and Luvisols, Vertisols and Stagnosols associated with Leptosols ( 12% of the state surface).

In areas with very high levels and high vulnerability, the general population – including producers, entrepreneurs and decision makers – must be informed and made aware that land use is adequately managed, because poor management or activities intensely productive would represent both potential threats and high risks of pollution.

By contrast, in areas with low levels and very low vulnerability, anthropic activities represent a lower risk of aquifer contamination.

Finally, the proposed approach is replicable and could be used to assess the vulnerability of aquifers in regions with similar environmental characteristics in Mexico, Guatemala, Belize, Cuba and the United States of America (Florida).

Aguilar, Y*., F. Bautista, M. Mendoza, O. Frausto, T. Ihl y C. Delgado. 2016. IVAKY: Índice de la vulnerabilidad del acuífero kárstico yucateco a la contaminación. Revisa Mexicana de Ingeniería Química, 15(3): 913-933.