Normal clay soil in front of the low cut, and then gradually increased in the soil at the bottom due to leaching process leaching moving clay from now on to accumulate in soil at bottom.
At the top of the clay soil is low, then gradually rise in the soil at the bottom. The leaching process Moving the clay from the upper to the lower accumulation in the soil.
Normal clay in upper cut surface soil is low quantity, then slowly rise in the soil at the bottom. The leaching process. A movable clay from now on to accumulate in the soil at the bottom.