Zoning of the use and quality of groundwater as a subsidy for the management of water resources: The case of the urban area of the municipality of Lençóis, Bahia, Northeastern Brazil

Jonatas Batista Mattos, Kaique Brito Silva, Jessé Moreira Lima, Lucas Athayde Oliveira

Abstract


The objective of this study is to zone the tubular well density and groundwater quality in the urban area of the city of Lençóis, Bahia, through geoprocessing techniques in the GIS platform. Lençóis, is a city of Chapada Diamantina, in the Brazilian Northeast that has in its territory tourism as main socioeconomic activities, receiving annually a high amount of visitors. The methodology used is based on data tabulation, kernel estimator runs for densities, and the Inverse Distance Weighted (IDW) algorithm for interpolation of nitrate and chloride contents. Both processes were executed in the ArcGis 10 software. The results showed the presence of a large zone with high density of wells in the central-east sector of the urban area of Lençóis, which presents high flow dynamics (vehicles, people), above to greater concentration of facilities such as hotels, inns, shops and restaurants. Notably, this sector has the greatest demand for water and needs to be monitored by competent institutions that seek to maintain a balance in the use of water resources, above to supply, even in periods of water stress. Inside this zone also traces of anthropic contamination occur, indicated by higher values of nitrate and chloride concentrations. This suggests that above to the pressure exerted by the high demand for water, there is inefficient management of wastewater and rainwater in this area of the urban area, compromising the quality of groundwater.


Keywords


Geoprocessing, spatial analysis, water resources

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DOI: https://doi.org/10.29150/jhrs.v7i1.22763

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