The gravity flow of groundwater through the pore spaces in rock or soil is called the percolation of water. The rate of absorption is different for different types of soils. This phenomenon of absorption of water by soil is termed percolation. The percolation rate of water is different in different types of soil. It is highest in the sandy soil and least in the clayey soil. The rate of absorption of soil depends on its composition.
Percolation rate= Amount of water (mL)/ Percolation time (min)