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Diriba and Fitamo

WQI ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ 1

Total Fe ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ 1 0.026

Cr 6+ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ 1 −0.160 0.026

NO₃⁻ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ 1 −0.370 −0.280 0.651

SO₄²⁻ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ 1 0.681 −0.090 −0.120 0.981

TH ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ 1 0.963 0.569 −0.120 −0.080 0.975

Ca 2+ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ 1 0.962 0.969 0.670 0.159 0.185 0.964

Mg 2+ ‑ ‑ ‑ ‑ ‑ ‑ ‑ ‑ 1 0.776 0.912 0.806 0.376 −0.090 0.036 0.850

K + ‑ ‑ ‑ ‑ ‑ ‑ ‑ 1 0.836 0.834 0.892 0.851 0.214 0.168 0.011 0.865
Table 7. Correlation matrix among the various water quality parameters
TA ‑ ‑ ‑ ‑ ‑ ‑ 1 0.815 0.652 0.566 0.666 0.580 −0.050 0.425 0.062 0.621

HCO₃⁻ ‑ ‑ ‑ ‑ ‑ 1 1 0.814 0.652 0.566 0.666 0.580 −0.050 0.425 −0.060 0.621 Abbreviations: EC: Electrical conductivity; T: Temperature; TH: Total hardness; TA: Total alkalinity; TDS: Total dissolved solids; WQI: Water quality index.

pH ‑ ‑ ‑ ‑ 1 0.084 0.084 −0.170 −0.360 −0.270 −0.310 −0.240 −0.170 0.801 −0.350 −0.200

TDS ‑ ‑ ‑ 1 0.195 0.720 0.720 0.945 0.866 0.956 0.976 0.961 0.504 0.044 0.128 0.972 Note: The coefficients in bold indicate a statistically significant positive correlation at the 0.05 level (two-tailed).

EC ‑ ‑ 1 1 0.195 0.720 0.720 0.945 0.866 0.956 0.976 0.961 0.504 0.044 0.128 0.972

Turbidity ‑ 1 0.470 0.471 0.159 0.246 0.246 0.287 0.374 0.551 0.510 0.541 0.573 0.217 0.766 0.447

T 1 0.265 0.526 0.526 0.239 0.419 0.419 0.699 0.353 0.446 0.448 0.470 0.120 0.042 0.478 0.452

Parameter T Turbidity EC TDS pH HCO₃⁻ TA K + Mg 2+ Ca 2+ TH SO₄²⁻ NO₃⁻ Cr 6+ Total Fe WQI

Volume 22 Issue 1 (2025) 110 doi: 10.36922/AJWEP025040023