Effective management of the nation's water resources depends on a precise understanding of the complete water cycle. This knowledge is essential for ensuring water sustainability amid evolving environmental conditions and demands. To meet this need, we have developed the National Agroecosystems Model (NAM), a comprehensive simulation framework that models the water budget for the entire contiguous United States. This state-of-the-art framework is distinguished by its key attributes:

• Unprecedented Scale: The model operates at a field-level resolution, simulating water dynamics for over 7 million individual agricultural fields and other areas, providing exceptionally detailed local and regional insights.


• Comprehensive Hydrology: It traces water movement through the nation's actual hydrographic network, incorporating the effects of major rivers, lakes, reservoirs, dams, and water conveyance systems.


• Open-Access Philosophy: Built exclusively with public data, the model itself is a fully open-access resource available to policymakers, water managers, agricultural stakeholders, and researchers.

The NAM provides a robust, data-driven platform to support a range of critical applications, including improving agricultural water efficiency, enhancing planning for events like droughts and floods, and strengthening long-term water sustainability strategies. It also serves as a foundational tool for developing next-generation artificial intelligence (AI) models for environmental analysis.