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Soil Survey Manual - Table 3-5
Internal free water occurrence classes
| Classes |
Criteria |
| Thickness if perched |
|
| Extremely Thin (TE) |
<10 cm |
| Very Thin (TE) |
10 to 30 cm |
| Thin (T) |
30 cm to 1 m |
| Thick (TK) |
>1 m |
| Depth |
|
| Very Shallow (SV) |
<25 cm |
| Shallow (S) |
25 to 50 cm |
| Moderately Deep (DM) |
50 cm to 1 m |
| Deep (D) |
1.0 to 1.5 m |
| Very Deep (DV) |
>1.5 m |
| Cumulative Annual Pattern |
|
| Absent (A) |
Not observed |
| Very Transitory (TV) |
Present <1 month |
| Transitory (T) |
Present 1 to 3 months |
| Common (C) |
Present 3 to 6 months |
| Persistent (PS) |
Present 6 to 12 months |
| Permanent (PM) |
Present Continuously |
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