On the other side, Figs. 4 and 5 depict the spatial distribution
of Mn and Fe in groundwater. The figures exhibit that the
content of those metals increases from southeast to northwest.
Furthermore, the correlation coefficients between the concentrations
of the heavy metals in mixed water and wastewater
were calculated and the results are introduced in Table 4.
Significant positive correlation was recorded for Mn with Fe,
Mn with Cu, Fe with Cu and strong correlation between the
contents of Mn, Fe, Cu and Zn in the mixed and waste waters.
Insignificant negative correlation was recorded for Pb with
other metals except Zn.