Infiltrate, also Infiltration (1) The rate of movement of water from the atmosphere into the soil, that portion of rainfall or surface runoff that moves downward into the subsurface rock and soil, the entry of water from precipitation, irrigation, or runoff into the soil profile. (2) The flow of a fluid into a substance through pores or small openings, to cause a liquid to permeate a substance by passing through its interstices or pores. It connotes flow into a substance in contradistinction to the word Percolation, which connotes flow through a porous substance. Also the process whereby water passes through an interface, such as from air to soil or between two soil horizons. (3) The technique of applying large volumes of waste water to land to penetrate the surface and percolate through the underlying soil.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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