RESILIENT WATER RESOURCE SYSTEMS AND ADAPTIVE HYDROLOGICAL ENGINEERING IN THE ERA OF CLIMATE UNCERTAINTY

Abstract

Climate change is rapidly dismantling the assumption of hydrological stationarity, imposing unprecedented stress on water security across climate-vulnerable regions. In Pakistan, where the Indus Basin sustains over 240 million people, accelerated glacial retreat, monsoon volatility, and groundwater overdraft have exposed critical vulnerabilities in conventional water infrastructure and rigid allocation regimes. This paper develops and validates an integrated framework for resilient water resource systems and adaptive hydrological engineering under deep climate uncertainty. Employing a mixed-methods design, we couple physically based hydrological modelling (SWAT/HEC-HMS) with downscaled CMIP6 ensembles, stochastic scenario generation, and adaptive decision-scaling protocols. The framework is empirically tested across three representative sub-basins of the Indus, integrating high-resolution remote sensing data, real-time telemetry, and stakeholder-informed governance pathways. Results indicate that adaptive engineering portfolios, comprising modular flood conveyance, dynamic reservoir operation algorithms, and nature-based storage augmentation, reduce systemic hydraulic and socio-economic vulnerability by 38–52% under RCP 4.5/8.5 trajectories. Crucially, resilience is contingent upon iterative design cycles, flexible institutional mandates, and decentralised water governance that embeds local hydrological knowledge. The study delivers a policy-ready, HEC-aligned research template that bridges advanced hydrological science with actionable engineering standards and national climate adaptation planning. It offers a scalable paradigm for water-secure infrastructure in non-stationary climates, with direct applicability to Pakistan’s National Water Policy, Climate Change Act implementation, and transboundary water diplomacy.