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Updated: Oct 29, 2025

Watershed Planning within a Quantitative Scenario Analysis Framework
Published on: July 24, 2016
A comprehensive review of groundwater vulnerability assessment using index-based, modelling, and coupling methods
Deepali Goyal1, A K Haritash1, S K Singh1
1Department of Environmental Engineering, Delhi Technological University, Delhi, 110042, India.
Groundwater vulnerability assessment uses GIS-based methods, but numerical models offer more precise quantification. Integrating both systems enhances data management and spatial analysis for contamination risk evaluation.
Area of Science:
- Environmental Science
- Hydrogeology
- Geographic Information Systems (GIS)
Background:
- Groundwater quality is increasingly threatened by contamination.
- Understanding groundwater flow, recharge, and pollutant transport is crucial for risk assessment.
- Existing methods for mapping groundwater vulnerability require comprehensive review.
Purpose of the Study:
- To compile and critically evaluate global methods for groundwater vulnerability assessment.
- To compare GIS-based index methods with numerical simulation models.
- To explore the integration of GIS and numerical models for improved groundwater management.
Main Methods:
- Comprehensive literature review of high-impact scientific journals.
- Analysis of GIS-based overlay and index methods (e.g., DRASTIC, GALDIT, GOD, COP, PI).
- Evaluation of numerical simulation models for groundwater vulnerability quantification.
Main Results:
- GIS-based index methods are widely used but lack numerical rigor.
- Modified indices offer quantitative estimates but may still have limitations.
- Numerical models provide elaborate quantification but demand extensive data and sophisticated software.
Conclusions:
- Integrating GIS with numerical models enhances data management and spatial analysis capabilities.
- Addressing data structure incompatibilities between GIS and numerical models is essential for effective coupling.
- Further development of uniform conversion software is needed for seamless integration.
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