GOD is an overlay and index method designed to map groundwater vulnerability over large regions based on three parameters (groundwater confinement, overlying strata, and depth to groundwater)
Quoted from: Ghazavi, R., Ebrahimi, Z. Assessing groundwater vulnerability to contamination in an arid environment using DRASTIC and GOD models. Int. J. Environ. Sci. Technol. 12, 2909–2918 (2015). https://doi.org/10.1007/s13762-015-0813-2
GOD is a vulnerability assessment method developed in Great Britain. Like DRASTIC, GOD is an overlay and index method designed to map groundwater vulnerability over large regions based on three parameters: (1) G, groundwater confinement, (2) O, overlying strata, and (3) D, depth to groundwater. The lowest level for aquifer pollution vulnerability is attributed to values <0.1 (negligible), while the highest level is ascribed to values >0.7 (extreme). Scores are assigned to each of the three categories and then multiplied to yield a final score.
The GOD index can be divided into five categories: negligible (0–0.1), low (0.1–0.3), moderate (0.3–0.5), high (0.5–0.7), and very high (0.7–1) (Foster et al. 2002). The higher number shows the greater relative pollution potential risk to another one. The groundwater confinement, overlying strata, type of soil, and depth to groundwater maps were created as described for DRASTIC model, but these maps were rated from 0 to 1 based on Table 4.
| GOD parameters | Range | Rating | Weight | Total weight (rating × weight) |
|---|---|---|---|---|
| Depth to water table (m) | 1 | |||
| 5–10 | 0.8 | 0.8 | ||
| 10–20 | 0.7 | 0.7 | ||
| 20–50 | 0.6 | 0.6 | ||
| Aquifer type | 1 | |||
| Unconfined | 1 | 1 | ||
| Lithology | 1 | |||
| Residual soil | 0.4 | 0.4 | ||
| Limon alluvial, loess, shale, fine limestone | 0.5 | 0.5 | ||
| Aeolian sand, siltite, tuf, igneous rock | 0.6 | 0.6 | ||
| Sand and gravel, sandstone, tufa | 0.7 | 0.7 | ||
| Gravel | 0.8 | 0.8 | ||
| Soil media | 1 | |||
| Clay | 0.5 | 0.5 | ||
| Clay–silt | 0.6 | 0.6 | ||
| Silt | 0.8 | 0.8 | ||
| Silt–sand | 0.9 | 0.9 | ||
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