Research Article
Groundwater Quality and Suitability Assessment in Tirupur Region, Tamil Nadu, India
Table 3
Classification of groundwater on the basis of EC, SAR, Na%, PI, MR, and Kelly’s ratio.
| Parameters | Range | Groundwater class | Samples (n = 49) | In. no | In% |
| Electrical conductivity (EC) | <250 | Excellent | 0 | 0 | 250–750 | Good | 3 | 14 | 750–2250 | Permissible | 13 | 62 | >2250 | Unsuitable | 5 | 24 |
| Sodium adsorption ratio | <6 | No problem | 21 | 100 | 6–9 | Increasing problem | 0 | 0 | >9 | Severe problem | 0 | 0 |
| Sodium percentage (Na %) | <20 | Excellent | 1 | 4 | 20–40 | Good | 16 | 76 | 40–60 | Permissible | 4 | 20 | 60–80 | Doubtful | 1 | 4 | >80 | Unsuitable | 0 | 0 |
| Soluble sodium percentage (SSP) | <50 | Suitable | 19 | 90 | >50 | Unsuitable | 2 | 10 |
| Residual sodium bicarbonate (RSBC) | <1.25 | Suitable | 16 | 76 | 1.25–2.5 | Marginal | 2 | 10 | >2.5 | Unsuitable | 3 | 14 |
| Permeability index (PI) | <60 | Suitable | 21 | 100 | >60 | Unsuitable | 0 | 0 |
| Magnesium hazard (MH) | <50 | Suitable | 16 | 79 | >50 | Unsuitable | 5 | 24 |
| Kelly’s index (KI) | <1 | Suitable | 18 | 86 | >1 | Unsuitable | 3 | 14 |
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