Water quality variable Type of test Coefficient p-value Trend Na+ Mann-Kendall 0.09 0.00 Increasing K+ Seasonal Kendall 0.18 0.00 Increasing SO42- Mann-Kendall -0.05 0.17 Decreasing EC Seasonal Kendall 0.19 0.00 Increasing SAR Mann-Kendall 0.08 0.02 Increasing

Table 3: Results of trend analysis using non-parametric methods.

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