Researchers have created a simulation that maps underground water on a continental scale. The results show the unseen path that a raindrop or melted snowflake takes before re-emerging in freshwater streams, following water from the land surface to depths far below and back up again, emerging up to 100 miles away, after spending from 10 to 100,000 years underground.
https://phys.org/news/2025-01-groundwater-simulation-uncovers-hidden-paths.html
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