Groundwater vulnerability assessment of an urban coastal phreatic aquifer in India using GIS-based DRASTIC model

The groundwater pollution in shallow aquifers is usually an outcome of urbanisation resulting from the discharge of industrial and domestic effluents. Maps of aquifer vulnerability to pollution are becoming more in demand because it addresses the degree of sensitivity of the groundwater system towar...

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Bibliographic Details
Published in:Groundwater for sustainable development 2022-11, Vol.19, p.100810, Article 100810
Main Authors: D, Aneesh T., Nair, Archana M., Prasad, Krishna R., J, Arun T., Srinivas, Reji
Format: Article
Language:English
Subjects:
Aquifer vulnerability
DRASTIC model
Hydro-chemical signatures
Sensitivity analysis
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Summary:The groundwater pollution in shallow aquifers is usually an outcome of urbanisation resulting from the discharge of industrial and domestic effluents. Maps of aquifer vulnerability to pollution are becoming more in demand because it addresses the degree of sensitivity of the groundwater system towards changes in intrinsic and extrinsic factors. With this aim, the DRASTIC method was adopted to address the vulnerable groundwater zones for shallow aquifers of Greater Cochin and the surrounding region. Seven hydrogeological parameters either measured in-situ for 98 dug wells or derived from secondary sources and satellite data were integrated into a GIS platform and modelled using DRASTIC. Rating for the DRASTIC factors was derived based on weights assigned to each parameter. The resultant map depicted vulnerability index values ranging 79 to 174 reclassified as very high (>144), high (144–131), medium (
ISSN:2352-801X
2352-801X
DOI:10.1016/j.gsd.2022.100810