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Rivers are an important part of our everyday lives. When a river physically or chemically changes, it can disrupt people, wildlife, and industry. If we could predict when and how these changes will occur, then we could better prepare—or even manage rivers in a sustainable way to maintain all their important functions. A research team is working to create tools that can predict how a river’s water level, course, and toxicity will change in the future. The project, called Earthcasting, works across the boundaries of physical and chemical experiments and theory—combining observations in the natural environment with the development of new mathematic models.