Pipeflow
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In hydrology, pipeflow is a type of subterranean water flow where water travels along cracks in the soil or old root systems found in above ground vegetation.
For fluid flow in a closed conduit, see pipe flow.
In such soils which have a high vegetation content water is able to travel along the 'pipes', allowing water to travel faster than throughflow. Here, water can move at speeds between 50 and 500 m/h.