Water table levels (m) Kriging

Areas (% of total)

Alluvial deposits

Marine sediments

Barreiras group

−9.3 to −5

0

0

0.2

−4.9 to −2

0.9

0.9

0.7

−1.9 to 0

1.1

14.6

2.2

0.1 to 2

20.7

39.2

4.3

2.1 to 5

49.2

46.1

10.6

5.1 to 10

17

0.1

18.5

10.1 to 20

10.7

0

31.4

20.1 to 43.5

1.3

0

33