During an intense drought from 2020 to 2022, the Upper Colorado River Basin lost far more groundwater than the Lower Basin did, despite having much higher natural recharge.

Source: [Live Science](https://www.livescience.com/planet-earth/rivers-oceans/surprising-new-pattern-of-groundwater-loss-may-signal-a-turning-point-for-the-colorado-river-basin)

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