Table 3 Vulnerability assessment criteria for the GOD, DRASTIC, and SI methods [20, 31, 69]
From: DRASTIC, GOD, and SI approaches for assessing groundwater vulnerability to pollution: a review
| Â | Â | Vulnerability index | Â |
|---|---|---|---|
DRASTIC | GOD | SI | |
Very low |  < 80 | – | – |
Low | 80–120 | 0.1–0.3 |  < 45 |
Moderate | 121–160 | 0.3–0.5 | 45–64 |
High | 161–200 | 0.5–0.7 | 65–85 |
Very high |  > 200 | 0.7–1 |  > 85 |