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and physiochemical paramaters like pH, Electrical Conductivity, Nitrate, Chloride, fluoride etc of the ground water is being ob- tained from the Central Ground Water Board(CGWB), Chennai. With the available data the integration of the Spatial database and Attribute database is done. With these we arrive at the output of vulnerable zones of the entire district. Similarly the exploitation level of the blocks is also drafted. Figure 2: Flow chart of the methodology

Figure 2 and physiochemical paramaters like pH, Electrical Conductivity, Nitrate, Chloride, fluoride etc of the ground water is being ob- tained from the Central Ground Water Board(CGWB), Chennai. With the available data the integration of the Spatial database and Attribute database is done. With these we arrive at the output of vulnerable zones of the entire district. Similarly the exploitation level of the blocks is also drafted. Figure 2: Flow chart of the methodology

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Table 1: Physico-chemical parameters I minerals from rocks and soil (Thompson et al., 2007). The per- missible limit is 6.5 to 8.5. Thanipadi area considered shows the highest value for pH and Arani area shows minimum value for pH respectively. All areas have their pH values well within the specified limit.
Table 1: Physico-chemical parameters I minerals from rocks and soil (Thompson et al., 2007). The per- missible limit is 6.5 to 8.5. Thanipadi area considered shows the highest value for pH and Arani area shows minimum value for pH respectively. All areas have their pH values well within the specified limit.
Figure 1: Thiruvannamalai district view
Figure 1: Thiruvannamalai district view
Figure 4: pH spatial distribution
Figure 4: pH spatial distribution
Figure 6: TH spatial distribution
Figure 6: TH spatial distribution
Figure 8: Mg spatial distribution Figure 7: Ca spatial distribution
Figure 8: Mg spatial distribution Figure 7: Ca spatial distribution
Figure 10: K spatial distribution Figure 9: Na spatial distribution
Figure 10: K spatial distribution Figure 9: Na spatial distribution
Figure 12: SO4 spatial distribution Figure 11: Cl spatial distribution
Figure 12: SO4 spatial distribution Figure 11: Cl spatial distribution
Figure 13: NO3 spatial distribution
Figure 13: NO3 spatial distribution
Figure 14: F spatial distribution
Figure 14: F spatial distribution
3.8 Chloride Table 2: physico-chemical parameters II
3.8 Chloride Table 2: physico-chemical parameters II
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