The soil layers are defined as follows:

   Layer        Thickness       Depth to Top    Depth to Bottom
     1         5 cm (2 in)        0 cm (0 in)     5 cm (2 in)
     2         5 cm (2 in)        5 cm (2 in)    10 cm (4 in)
     3        10 cm (4 in)       10 cm (4 in)    20 cm (8 in)
     4        10 cm (4 in)       20 cm (8 in)    30 cm (12 in)
     5        10 cm (4 in)       30 cm (12 in)   40 cm (16 in)
     6        20 cm (8 in)       40 cm (16 in)   60 cm (24 in)
     7        20 cm (8 in)       60 cm (24 in)   80 cm (31 in)
     8        20 cm (8 in)       80 cm (31 in)  100 cm (39 in)
     9        50 cm (20 in)     100 cm (39 in)  150 cm (59 in)
    10        50 cm (20 in)     150 cm (59 in)  200 cm (79 in)
    11        50 cm (20 in)     200 cm (79 in)  250 cm (98 in)