What effect do the tiny pore spaces formed by tightly packed clay particles have on drainage?

Answer

They restrict water movement significantly, leading to slow drainage rates

Because clay particles are the smallest, they pack tightly, resulting in very small pore spaces that severely impede the rate at which water can travel downward.

What effect do the tiny pore spaces formed by tightly packed clay particles have on drainage?
ratewatersoildrainagepermeability