Table 4
Lake water classification based on the average concentrations of water quality parameters provided in Table 1 in relations to CONAMA Resolution 357 (Brasil, 2005).
| Parameters | Vl | Am | TI1 | TI2 | TI3 | Resolução CONAMA 357/2005 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry | Rainy | Dry | Rainy | Dry | Rainy | Dry | Rainy | Dry | Rainy | Class I | Class II | Class III | |
| DO (mg/L) | I | I | I | I | I | I | I | I | I | I | >6 | >5 | >4 |
| BOD (mg/L) | I | I | I | I | III | II | II | III | II | II | 3 | 5 | 10 |
| TP (μg/L) | I | III | I | I | II | I | I | I | I | I | 20 | 30 | 50 |
| Turbidity (NTU) | I | I | I | I | I | I | I | I | I | I | 40 | 100 | 100 |
| Cl− (mg/L) | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | 250 | 250 | 250 |
| Fecal coliform E. coli(NMP/100ml) | I | I | I | I | I | I | I | I | I | I | 200 | 1000 | 4000 |
 (mg/L) |
I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | 10 | 10 | 10 |
 (mg/l) |
I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | 1 | 1 | 1 |
 (mg/L) |
I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | 250 | 250 | 250 |
| Dissolved Al (mg/L) | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | 0.1 | 0.1 | 0.2 |
| Dissolved Fe (mg/L) | I,II | I,II | I,II | I,II | III | I,II | I,II | I,II | I,II | I,II | 0.3 | 0.3 | 5 |
| Total Mn (mg/L) | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | 0.1 | 0.1 | 0.5 |
| Total Zn (mg/L) | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | I,II | 0.18 | 0.18 | 5 |
| Chlorophyll-a (μg/L) |
I | I | I | I | II | I | I | I | I | I | 10 | 30 | 60 |
| Cyanobacteria (cell/ml) | I | I | I | I | I | I | I | I | I | I | 20.000 | 50.000 | 100.000 |
E. coli (Escherichia coli) is determined as coliform thermotolerant. Class I: These waters that can be designed to supply for consumption human (after simplified treatment); Class II designed to supply for human consumption (after treatment conventional); Class III: water that can be designed to supply for consumption human (after conventional or advanced treatment).
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