5. Conclusions
The overal 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 al the wel s in the 1 st layer (viz., wel s
at about a distance of 500m from River Noyyal) are highly pol uted 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 fal away (1500 to 2500m) from River Noyyal.
4. Results of Wilcox diagram clearly indicates that al the wel s belonging to the 1 st
layer is not suitable for irrigation but the wel s pertaining to 2nd layer ilustrates
partly permissible to irrigation
5. Wilcox results demonstrate that wel s belonging to 4 th and 5th layers are very
much unsuitable for irrigation.
6. The influence of pol uted 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 ilustrate 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 pol uted water from River Noyyal.
9. Overlay map shows that the wel s faling in the northern part of River Noyyal are
less pol uted compared to the wel s in the southern part. This indicates that the
wel s 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.