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<p>Surface-based recharge-priority maps may overstate managed aquifer recharge potential in hard-rock aquifers because infiltration-friendly terrain does not necessarily coincide with weathered or fractured storage at depth. This study tests the hypothesis that recharge prioritisation in Deccan basalt terrain becomes more defensible when GIS-AHP surface suitability is constrained by Vertical Electrical Sounding (VES)-derived aquifer architecture. The Kangti Mandal watershed, Telangana, India, was analysed using nine thematic layers: geomorphology, drainage density, slope, geology, VES-derived aquifer distribution, lineament density, soil, land use/land cover, and rainfall. The Analytical Hierarchy Process (AHP) was implemented with explicit factor weights, consistency testing, class-level hydrogeological rationale, weighted-overlay modelling, sensitivity checks, and subsurface plausibility assessment. The AHP model yielded a consistency ratio of 0.081, below the accepted 0.10 threshold. Weighted overlay delineated four recharge-priority classes: excellent (about 453&#xa0;km²; 44.8%), good (about 379&#xa0;km²; 37.4%), moderate (about 9&#xa0;km²; 0.9%), and poor (about 172&#xa0;km²; 17.0%). VES interpretation identified shallow aquifer domains (36.4%), deep aquifer domains (9.0%), combined aquifer domains (11.9%), and no-aquifer domains (42.7%), enabling geomorphically favourable but hydrogeologically weak sectors to be downgraded. The highest-priority zones occur where favourable landforms, low to moderate drainage density, structural permeability, and shallow or combined aquifer conditions coincide, particularly near Ghanpur, Jamgikhurd, and Jamgiburg. The framework converts a conventional GIS-AHP exercise into a testable hydrogeological screening workflow for managed aquifer recharge in semi-arid basaltic watersheds.</p>

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Subsurface filtering of recharge-priority maps in Deccan basalt aquifers: VES-constrained GIS-AHP evidence from Kangti, Telangana, India

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Taufique Warsi,
  • Pallavi Kulkarni,
  • Aditya Shinde,
  • George Biswas,
  • Marcella D’Souza

摘要

Surface-based recharge-priority maps may overstate managed aquifer recharge potential in hard-rock aquifers because infiltration-friendly terrain does not necessarily coincide with weathered or fractured storage at depth. This study tests the hypothesis that recharge prioritisation in Deccan basalt terrain becomes more defensible when GIS-AHP surface suitability is constrained by Vertical Electrical Sounding (VES)-derived aquifer architecture. The Kangti Mandal watershed, Telangana, India, was analysed using nine thematic layers: geomorphology, drainage density, slope, geology, VES-derived aquifer distribution, lineament density, soil, land use/land cover, and rainfall. The Analytical Hierarchy Process (AHP) was implemented with explicit factor weights, consistency testing, class-level hydrogeological rationale, weighted-overlay modelling, sensitivity checks, and subsurface plausibility assessment. The AHP model yielded a consistency ratio of 0.081, below the accepted 0.10 threshold. Weighted overlay delineated four recharge-priority classes: excellent (about 453 km²; 44.8%), good (about 379 km²; 37.4%), moderate (about 9 km²; 0.9%), and poor (about 172 km²; 17.0%). VES interpretation identified shallow aquifer domains (36.4%), deep aquifer domains (9.0%), combined aquifer domains (11.9%), and no-aquifer domains (42.7%), enabling geomorphically favourable but hydrogeologically weak sectors to be downgraded. The highest-priority zones occur where favourable landforms, low to moderate drainage density, structural permeability, and shallow or combined aquifer conditions coincide, particularly near Ghanpur, Jamgikhurd, and Jamgiburg. The framework converts a conventional GIS-AHP exercise into a testable hydrogeological screening workflow for managed aquifer recharge in semi-arid basaltic watersheds.