ASSESSMENT OF VULNERABILITY TO ANTHROPOGENIC POLLUTION IN AQUIFERS OF THE NATAL METROPOLITAN REGION
Intrinsic vulnerability - Lithology - Hydraulic confinement - Geoprocessing - Map algebra
Groundwater in semi-arid regions, becomes a vital resource for the development of life. Traditionally, groundwater has been considered protected by the subsoil, however, the disposal of stable pollutants in favorable infiltration zones can generate contamination of the water resource, putting the health of the population at risk. To solve the growing crisis of aquifer contamination due to anthropic activities, vulnerability assessment is a fundamental requirement to generate guidelines, strategies, and policies to prevent and minimize groundwater contamination. The present study aims to evaluate the vulnerability to anthropogenic pollution in aquifers of the Metropolitan Region of Natal. In this research the GODS method was used, which proposes a calculation of vulnerability through the multiplication of four geological and hydrological parameters, which are: degree of hydraulic confinement, occurrence of the underlying substratum, distance to the groundwater level and finally soil type, using geoprocessing tools in a geographic information system. As a result, it was obtained that most of the territory is in a low vulnerability level with 39.92% and medium level with 31.48%, followed by a high vulnerability level with 17.74%, 8% extreme and 2.87% insignificant.