EXPLORING THE IMPLICATIONS OF CLIMATE CHANGE ON WATER RESOURCES: DEVELOPING EFFECTIVE MANAGEMENT STRATEGIES

Abstract

Climate change profoundly threatens Pakistan's Indus Basin water resources, serving 240 million people across 1.2 million km² where agriculture consumes 90% of supplies amid 81 MAF deficits projected by 2025. This mixed-methods study integrates SWAT+ hydrological modeling (R²=0.87), GIS vulnerability mapping (WRI=0.48 basin-wide), CGE macroeconomic simulations ($120B annual GDP losses by 2040), and Delphi consensus from 25 experts across 7 physiographic zones. Findings reveal 22-38% runoff declines by 2100 (RCP4.5/8.5), -2.1 m/yr aquifer depletion, 28% salinization, and institutional fragmentation delaying releases 15 days/season. Rechna Doab (WRI=0.41) and Sindh delta (WRI=0.32) emerge as critical hotspots where tailenders suffer 40% supply inequities.

Pilots validate scalable solutions: managed aquifer recharge (+28% retention), drip retrofits (87% efficiency), karez rehabilitation (+22% supply). Nine interventions GIS zoning, blockchain metering, PKR 250B PPP dams—promise 3.2x ROI, lifting WRI to 0.85 and securing $5T blue economy by 2050. This triangulated framework (87% quant-qual concordance) redefines Indus resilience from scarcity narrative to efficiency arbitrage, positioning Pakistan as South Asia's water stewardship leader