The phreatic zone, or zone of saturation, is the part of an aquifer, below the water table, in which relatively all pores and fractures are saturated with water. The phreatic zone size, color, and depth may fluctuate with changes of season, and during wet and dry periods.

Clay is the most porous sediment but is the least permeable. Clay usually acts as an aquitard, impeding the flow of water.

PERMEABILITY= How WELL water can flow through soil particles. PERCOLATION= The RATE at which water can travel through the soil particles.

Why would a farmer need to know the soil permeability of his land? Farmers need to know this information in order to know how much water is needed to irrigate his crops.

Thus, the Percolation process represents the flow of water from unsaturated zone to the saturated zone….

As nouns the difference between percolation and leaching is that percolation is the seepage or filtration of a liquid through a porous substance while leaching is the process by which something is leached.

Percolation literally means to filter through when passed through some porous material or substance while absorption simply means absorbing of any liquid by any absorbent. Percolated liquid= total liquid passed- liquid absorbed by the absorbent.

Percolation is the property of absorption of water by soil. The percolation rate is the amount of water absorbed by any soil at any given time.

The rate of absorption of a soil depends on its composition. A soil with more percolation rate can hold water for longer time. On the other hand a soil with poor percolation rate will hold water for shorter time. Percolation rate helps in selection of suitable soil for crop growth.

In physics, chemistry and materials science, percolation (from Latin percolare, “to filter” or “trickle through”) refers to the movement and filtering of fluids through porous materials.