Abstract
The rapid increase in demand and consumption of groundwater in the past few decades has imposed colossal pressure on the stakeholders responsible for groundwater management. Assessment of groundwater vulnerability and knowledge about hydrogeological settings are crucial for a particular region, especially at a local scale, to manage groundwater resources effectively. The present study aimed to develop a modified DRASTIC model to demarcate groundwater vulnerability zones based on experimental analysis of field samples to make the model more feasible at local scale. Four techniques were implemented in this study to determine groundwater vulnerability zones: (a) DRASTIC; (b) DRASTIC–AHP (analytic hierarchy process); (c) Modified DRASTIC; (d) Modified DRASTIC–AHP. The best groundwater vulnerability model was determined based on validation results with groundwater nitrate concentration. The comparative assessment showed that the Modified DRASTIC–AHP outperformed the other models. More than 50% of the study area was classified as ‘high’ (33.06%) and ‘very high’ (21.31%) groundwater vulnerability zones. The vulnerability map shows that high vulnerable zones dominate in the northwestern part and in some portions of the floodplain near central part of the study area. The results of this study envision that inclusion of experimentally derived parameters can be used to modify the conventional DRASTIC model and obtain better results at local scale.
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Acknowledgments
We would like to acknowledge Principal College of Agriculture, Tripura and Department of Soil Science lab for providing us resources to carry out the lab testing and analysis as well as Central groundwater Board, North Eastern Region (NER), Guwahati (CGWB) and Drinking Water & Sanitation division (DWS) under Public Works Department (PWD), Agartala for sharing necessary data for the analysis. The authors also thank the reviewers and the editor for providing valuable suggestions and technical comments to improve the manuscript quality.
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Mallik, S., Bhowmik, T., Mishra, U. et al. Local Scale Groundwater Vulnerability Assessment with an Improved DRASTIC Model. Nat Resour Res 30, 2145–2160 (2021). https://doi.org/10.1007/s11053-021-09839-z
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DOI: https://doi.org/10.1007/s11053-021-09839-z