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Justification: The newly proposed percolation is the downward movement of water under hydrostatic pressure in the satured saturated zone.This water might still end up in rivers and lakes as discharge but it is a slower process than water runoff or drainage. Such defined percolation is an input for hydrological models together with e.g. water runoff. If percolation is to the groudn ground water , it can also be named as ground water recharge.
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