The fraction you make by putting current topsoil over original topsoil will determine which box you check on your land card. This is determined by your subsoil. A coarse subsoil means rapid permeability. Moderately coarse and medium subsoils mean moderate permeability. Moderately fine means slow permeability.
Fine subsoil means very slow permeability.
This is determined by slope and or surface texture and or permeability. I look at the boxes that you have checked . The highest red number to the left of the boxes will be the number you put for land capability class. We will discuss these combinations later .