The permeability of soil can be high and low. It is describing the connections between liquid and air and their possibility to move through the soil. For example, as the liquid we can take water.
Highly permeable soils is referring to the high infiltration rates which is the product of the Sandy soils. They are also doing a good drainage.
Some of the soils have small pores and they are not having good drainage as sandy soils, for example, clay and more.
