Vulnerability class Surface of area of particular clas-ses of vulnerability [km2] Practical specification of vulnerability classes (developed on the basis of Foster et.al. 2002)
DRASTICindex CD index NV index
Avery low <1 <1 <1 Practically no vulnerability of groundwater to contamina-tion
B low 13 2 426 Vulnerability of groundwater to conservative contamina-tion in their constant effect.
C medium 324 247 136 Vulnerability of groundwater to some contamination,mainly conservative in conditions of their constant effect.
D moderately-high 229 340 57 Vulnerability of groundwater to some contamination, but only in conditions of their constant effect.
E high 53 30 <1 Vulnerability of groundwater to a lot of contamination and fast activity of contamination in many situations.
F very high <1 <1 <1 Vulnerability of groundwater to a lot of contamination and fast activity of contamination in most situations.
Table 10: Area of particular classes of intrinsic and specific vulnerability.