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Use of geographical information system and water quality index to assess groundwater quality in El Khairat deep aquifer (Enfidha, Central East Tunisia)

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Abstract

Groundwater is the most important natural resource used for drinking by many people around the world, especially in rural areas. In Tunisia, since the quantity and the quality of water available for different uses is variable from one place to another, groundwater quality in El Khairat deep aquifer was evaluated for its suitability for drinking purposes. To this end, an attempt has been made for the first time in order to determine spatial distribution of groundwater quality parameters and to identify places with the best quality for drinking within the study area based on: (1) an integrated analysis of physical–chemical parameters, (2) use of Geographical Information System, and (3) Water Quality Index (WQI) calculation. The physical–chemical results were compared with the World Health Organization (WHO) standards for drinking and public health, in order to have an overview of the present groundwater quality. According to the overall assessment of the basin, almost all the parameters analyzed are above the desirable limits of WHO. Using GIS contouring methods with Arcview 3.2a, spatial distribution maps of pH, TDS, EC, TH, Cl, HCO3, SO4, NO3, Ca, Mg, Na, and K have been created. The spatial analysis of groundwater quality patterns of the study area shows that the TDS value increases from north-west to south-east following the general trend of the Khairat aquifer flow direction. The spatial distribution map of TH shows that a majority of the groundwater samples falls in the very hard category. WQI was used to assess the suitability of groundwater from the study area for human consumption. From the WQI assessment, over 82% of the water samples fall within the “Poor” and “Very poor” categories, suggesting that groundwater from the south-eastern of the El Khairat deep aquifer is unsuitable for drinking purposes.

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Authors and Affiliations

  1. Laboratory of Geochemistry and Environmental Geology, Department of Geology, Faculty of Mathematical, Physical and Natural Sciences, University Campus, 1060, Tunis, Tunisia

    Mouna Ketata & Moncef Gueddari

  2. Modelling in Hydraulic and Environment Laboratory, National Engineers School of Tunis, Le Belvédère, BP 37, Tunis, 1002, Tunisia

    Mouna Ketata & Rachida Bouhlila

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  1. Mouna Ketata
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  2. Moncef Gueddari
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  3. Rachida Bouhlila
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Correspondence to Mouna Ketata.

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Ketata, M., Gueddari, M. & Bouhlila, R. Use of geographical information system and water quality index to assess groundwater quality in El Khairat deep aquifer (Enfidha, Central East Tunisia). Arab J Geosci 5, 1379–1390 (2012). https://doi.org/10.1007/s12517-011-0292-9

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