Water quality variable Type of test Coefficient p-value Trend Mg2+ ANCOVA 4.45 0.00 Increasing HCO3− ANCOVA 18.29 0.00 Increasing pH linear regression 1.85 0.07 Not trend Ca2+ linear regression 14.30 0.00 Increasing Cl- ANCOVA 11.64 0.00 Increasing TDS ANCOVA 2.19 0.03 Increasing Hardness ANCOVA 8.68 0.00 Increasing

Table 2: Results of trend analysis using parametric methods.

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