also indicates that the wel s are highly affected but to a slight lesser degree compared to zone
1 of layer 1 wel s. The 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. The integrated map
clearly demonstrates that the wel s belonging to the 3 rd
, 4 th and 5 th layer are not pol uted and
the influence of River Noyyal is not significant at these levels.