Some surface soils in the area keep a high clay content (very small part, so they keep high porosity but low permeability.
Permeability is a extent of the comfort of flow of a fluid via a porous solid.
A rock may be overly porous, but if the pores are not related, it will have no permeability.
So they keep high porosity but low permeability.
To learn more about permeability click here:
https://brainly.com/question/22370062
#S[PJ4