Groundwater management is important for global and local sustainability, because of not only connectivity of large groundwater footprints through the global trade and local groundwater depletion, but also climate change impacts on groundwater resources directly and indirectly, and carbon emissions through human activities using groundwater. Groundwater, energy and food are interlinked each other beyond the boundaries of each shed as well as trans-spatially through the food and energy trades. Interactions between groundwater-food-energy nexus and environmental/ economical/social impacts, are analyzed in terms of multi-scale integrated management and governance of the nexus by increasing synergies and reducing trade-offs in Belmont Forum project on Urban water-energy-food (WEF) nexus. A decision support integrated model is developed to analyze the WEF nexus and assess environmental and economic impacts, with three databases of resources, interlinkage, and scenario in multi-spatial scale. Tradeoffs are analyzed between economy and environment as well as local and national scale.