The Hydro-Economic Decision Support System, based on the Computable General Equilibrium for Water (CGE-W) Model, is a sophisticated analytical framework developed by International Food Policy Research Institute and adapted by the International Water Management Institute (IWMI). It is designed to evaluate the economic impacts of water policies, management strategies, and climatic or hydrological changes across different sectors and regions of Pakistan.

The CGE-W model integrates hydrological component and Social Accounting Matrix (SAM) within a unified analytical platform, allowing policymakers and researchers to simulate how variations in water availability, land allocation, and pricing influence the broader economy.

Through scenario-based analysis, the model helps decision-makers to:

• Assess trade-offs between competing water uses under different management or policy options.
• Optimize resource allocation to achieve sustainable and equitable water distribution.
• Quantify economic losses or gains resulting from climate change, or policy interventions.
• Support evidence-based planning for long-term water security and resilience under climate change.

By linking water resource dynamics with macroeconomic variables, the CGE-W model provides a powerful decision-support tool that enhances understanding of the nexus between water, economy, and sustainability, enabling governments and development partners to design integrated and adaptive water policies that balance economic growth with environmental stewardship.