This term refers to a region beneath and alongside a stream bed, where there is mixing of shallow groundwater and surface water. The flow dynamics and behavior in this zone (hyporheic flow or underflow) is recognized to be important for surface water/ groundwater interactions, as well as fish spawning, among other processes.

The assemblage of organisms which inhabits this zone are called hyporheos.

The context of this term is the reconstruction of a streambed where extreme erosion has taken place and there is some concern about where and how the water will flow, both to ensure the production of benthic invertebrates, and to keep everything stable so there is no repetitive mass wasting in the watershed.

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