5. Conclusions
The overall findings of the present study were summarized below:
1. SAR values clearly demonstrates that the seasonal effect on the chemical
parameters is significant.
2. Layerwise study of SAR demonstrates that all the wells in the 1 st layer (viz., wells
at about a distance of 500m from River Noyyal) are highly polluted since the SAR
values are very high in this region.
3. The effect of percolation is not significant in the 3 rd to 5 th layer in the study area
since these layers fall away (1500 to 2500m) from River Noyyal.
4. Results of Wilcox diagram clearly indicates that all the wells belonging to the 1 st
layer is not suitable for irrigation but the wells pertaining to 2nd layer illustrates
partly permissible to irrigation
5. Wilcox results demonstrate that wells belonging to 4 th and 5th layers are very
much unsuitable for irrigation.
6. The influence of polluted river water to the groundwater aquifers is highly
significant about 1 km from River Noyyal on both north and south directions.
7. Results of USSL diagram also found to be complementary with the above findings.
8. Contour plots illustrate that the first zone belonging to the 1 st layer is highly
affected and the last zone (5 th zone) is the least affected with regard to the
percolation effect of the polluted water from River Noyyal.
9. Overlay map shows that the wells falling in the northern part of River Noyyal are
less polluted compared to the wells in the southern part. This indicates that the
wells in the northern part of the study area are more confined and the nature of
soil may also play a dominant role in the variation of percolation.