Research Article
Assessment of Groundwater Quality along the Cooum River, Chennai, Tamil Nadu, India
Table 9
Regression equations based on analyzed parameters.
| Year | Regression equation | value | value |
| | Premonsoon | | |
| 2009 | EC = 36.358 * pH + 0.807 * TDS + 107.888 * BOD + 24.851 * COD − 3.528 * Na + 6124.594 * Pb − 1231.212 | 0.958 | 49.555 | 2010 | EC = 2.818 * pH + 0.211 * TDS − 94.336 * BOD + 71.715 * COD + 2.966 * Na + 6154.062 * Pb − 671.780 | 0.892 | 17.981 | 2011 | EC = −184.985 * pH + 0.571 * TDS + 66.079 * BOD + 31.193 * COD + 0.332 * Na + 1575.589 * Pb + 487.066 | 0.945 | 37.07 |
| | Postmonsoon | | |
| 2009 | EC = −86.422 * pH + 0.594 * TDS + 4.994 * BOD + 25.715 * COD − 0.229 * Na + 2456.061 * Pb + 306.783 | 0.977 | 91.861 | 2010 | EC = −45.855 * pH + 0.683 * TDS − 30.021 * BOD + 25.132 * COD − 0.619 * Na + 3254.098 * Pb + 119.508 | 0.969 | 67.6 | 2011 | EC = −17.058 * pH + 0.495 * TDS − 10.607 * BOD + 36.501 * COD − 0.134 * Na + 1181.900 * Pb − 476.028 | 0.969 | 68.523 |
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