Table 1
Physical and chemical parameters measured in the water samples from Crestuma reservoir and lake Vela for the two sampling periods. Comparison between the thereshold values for these parameters for Good Ecological Potential (GEP) in northern reservoirs established by WFD. Bold values stand for values outside the established thresholds.
| Parameters | Limit to GEP Northern reservoirs | Crestuma reservoir | Lake Vela | ||
|---|---|---|---|---|---|
|
|
|
||||
| Summer | Spring | Summer | Spring | ||
| Dissolved oxygen (mg/L) | ≥5 | 6.29 | 3.20 | 1.35 | 2.02 |
| Oxygen saturation rate (%) | 60–120 | 77.9 | 35.1 | 19.0 | 22.5 |
| pH | 6−9 | 7.48 | 5.48 | 7.47 | 5.68 |
| Nitrates (mg/L) | ≤25 | 3.0 | 1.4 | 2.1 | 0.8 |
| Total phosphorus (mg/L) | ≤0.05 | 0.04 | 0.03 | 385.34 | 0.20 |
| Temperature (°C) | – | 24.8 | 19.2 | 21.7 | 20.5 |
| Conductivity (μS/cm) | – | 276 | 211 | 700 | 473 |
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