Hyporheic zones under streambeds mix river water with groundwater
Beneath many gravelly streams, water slips into the bed, travels slowly through pores, then resurfaces downstream — a hidden hyporheic zone linking surface and groundwater.
In that dark filter, microbes process nutrients and pollutants while insects find cool refuge. Temperature and chemistry of the open channel often depend on this underground remix.
Rivers are thicker than their mirror. Hyporheic ecology shows rivers-lakes health includes the invisible aquifer skin under the stones.
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