Percolation

A Percolation is the movement of groundwater from the unsaturated zone to the saturated zone

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Other /More definition:
A percolation is (1) The movement of water through the openings in Rock or soil. (2) the entrance of a portion of the streamflow into the channel materials to contribute to ground water replenishment.

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Other /More definition:
Percolation is the passage of a liquid through the spaces of a porous material such as soil.