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Table 1. Conceptual model of drought intensity-duration-frequency.
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| Climate Type | Superarid | Hyperarid | Arid |
Semiarid | Subhumid | Humid |
Hyperhumid | Superhumid |
| Pma (mm) |
100 | 200 | 400 | 800 | 1600 | 3200 | 6400 |
| Pma / Pagt |
0.125 | 0.25 | 0.5 | 1 | 2 | 4 | 8 |
| Eap (mm) |
3000 | 2400 | 2000 | 1600 | 1200 | 1200 | 1200 |
| Eap / Pma |
30 | 12 | 5 | 2 | 0.75 | 0.375 | 0.1875 |
| Lrs (mo) |
1 | 2 | 3 | 4 | 6 | 9 | 12 |
| Moderate intensity | 0.25 | 0.5 | 1.0 |
1.5 | 1.0 | 0.5 | 0.25 |
| Severe intensity | 0.5 | 1.0 | 2.0 |
3.0 | 2.0 | 1.0 | 0.5 |
| Extreme intensity | 0.75 | 1.5 | 3.0 |
4.5 | 3.0 | 1.5 | 0.75 |
| Duration (yr) | 1 | 2 | 4 |
6 | 4 | 2 | 1 |
| Frequency (yr) | 2 | 3 | 6 |
12 | 25 | 50 | 100 |
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