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The DUPIT index is one of the weighting/rating driven indicators that are related to the index and overlay approach (Simsek et al. 2005). It is determined to infer the protectability of the groundwater against diffuse pollution through the unsaturated zone and to delineate the zones of high or low vulnerability to this hazard. The hydrogeochemical, hydrogeological and physical factors inherent in the system (Depth to groundwater table, Upper layer lithology, Permeability of the unsaturated zone, Impermeable layer thickness and Topographic slope) are explored and assigned weighting and rating scores, Table 13 (Simsek et al. 2005), based on their values in the different water points. An overall DUPIT index is calculated from these scores as follows:
formula
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Table 13

DUPIT index parameters and their classification (Simsek et al. 2005)

FactorWeightRangeRatingSuitability
Depth to groundwater table <5 Very Low 
5–15 Low 
15–30 Medium 
30–50 High 
>50 Very High 
Upper layer lithology Fractured rocks Very Low 
Sand and gravel Low 
Silty sand, clayey and silty gravel Medium 
Silty and clayey sand High 
Clay, schists and flysch, massive rocks Very High 
Permeability of unsaturated zone (m/s) >1.0 × 10−2 Very Low 
1.0 × 10−2– 1.0 × 10−3 Low 
1.0 × 10−3– 1.0 × 10−5 Medium 
1.0 × 10−5– 1.0 × 10−7 High 
<1.0 × 10−7 Very High 
Impermeable thickness (m) <3 Very Low 
3–6 Low 
6–12 Medium 
12–24 High 
>24 Very High 
Topographic slope (o>60 Very Low 
40–60 Low 
20–40 Medium 
10–20 High 
<10 Very High 
FactorWeightRangeRatingSuitability
Depth to groundwater table <5 Very Low 
5–15 Low 
15–30 Medium 
30–50 High 
>50 Very High 
Upper layer lithology Fractured rocks Very Low 
Sand and gravel Low 
Silty sand, clayey and silty gravel Medium 
Silty and clayey sand High 
Clay, schists and flysch, massive rocks Very High 
Permeability of unsaturated zone (m/s) >1.0 × 10−2 Very Low 
1.0 × 10−2– 1.0 × 10−3 Low 
1.0 × 10−3– 1.0 × 10−5 Medium 
1.0 × 10−5– 1.0 × 10−7 High 
<1.0 × 10−7 Very High 
Impermeable thickness (m) <3 Very Low 
3–6 Low 
6–12 Medium 
12–24 High 
>24 Very High 
Topographic slope (o>60 Very Low 
40–60 Low 
20–40 Medium 
10–20 High 
<10 Very High 
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