In general, four types of assessment methods for vulnerability are empolyed:
- Index methods such as DRASTIC (Foster at al., 2013)
- Statistical methods (e. g. logistic regression)
- Process-based groundwater models (e. g. MODFLOW; Sonnenborg et al. 2015)
- Cognitive Site-specific Concept for Assessment of Nitrate Vulnerability of Aquifers (SCANVA; Hansen et al. 2016)