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Suggested future directions for integrated national-scale water resources trend assessments. Information from the four water resources domains (surface and groundwater quantity and quality) remain at the core of trend assessments, but the development and integration of additional capabilities are needed and include: increased understanding of groundwater-surface water interactions (blue arrows); better quantification of water use for human needs, and the refinement of trend metrics to account for the competing needs of society and ecological integrity (middle blue circle). Changes in water resources will need to be evaluated within the context of large-scale driving forcings like climate, land use, and human water use (outer orange circle).