Table 5 - Soil moisture storage capacity (Smax) classes derived for FAO soil units and for soil depth/volume limiting soil phases

CLASS
(mm)
Soils with Lithic Phase
(mm)
Soils with Petrocalcic,
Petrogypsic, Petroferric
and Duripan Phases
Soils with Petric
and Stony Phases

1

150 mm

50 mm

115/50 mm

75 mm

2

125 mm

40 mm

90/40 mm

65 mm

3

100 mm

35 mm

75/35 mm

50 mm

4

75 mm

25 mm

55/25 mm

40 mm

5

50 mm

15 mm

35/15 mm

25 mm

6

15 mm

n.a.

n.a.

n.a.