Stressor | Stressor code | Description | Mean | Median | Min | Max | RT | %Samples at risk |
---|---|---|---|---|---|---|---|---|
Physico-chemistry | T | Maximum water temperature [°C] | 20.48 | 20.70 | 12.50 | 24.90 | – | – |
O2 | Minimum oxygen concentration [mg/L] | 8.03 | 8.10 | 5.70 | 10.20 | 7 | 22%a | |
TP | Mean total phosphate concentration [mg/L] | 0.13 | 0.14 | 0.02 | 0.24 | 0.1 | 67% | |
TN | Mean total nitrogen concentration [mg/L] | 4.38 | 4.65 | 0.50 | 7.91 | – | – | |
Cl | Mean chloride concentration [mg/L] | 72.67 | 76.60 | 17.38 | 237.63 | 200 | 2% | |
SO4 | Mean sulphate concentration [mg/L] | 83.83 | 91.39 | 24.39 | 252 | 200 | 2% | |
Fe | Mean total iron concentration [mg/L] | 0.91 | 0.92 | 0.15 | 2.53 | 0.7 | 63% | |
NO2-N | Mean total nitrite nitrogen concentration [mg/L] | 0.04 | 0.04 | 0.01 | 0.13 | 0.05 | 43% | |
NH4-N | Mean total ammonium nitrogen concentration [mg/L] | 0.12 | 0.11 | 0.03 | 0.37 | 0.1 | 55% | |
Mixture toxicity | RQmix,acute | Risk quotient of acute mixture toxicity | 0.23 | 0.18 | 0.06 | 1.29 | 1 | 2% |
RQmix,chr | Risk quotient of chronic mixture toxicity | 0.77 | 0.73 | 0.20 | 1.98 | 1 | 18% | |
Hydrological alteration | fh5 | High flow frequencyb | 19.05 | 20.50 | 4.00 | 41.00 | – | – |
dl16 | Low flow pulse durationc | 8.89 | 5.18 | 3.15 | 36.72 | – | – | |
ra5 | Number of day risesd | 0.38 | 0.38 | 0.27 | 0.49 | – | – | |
MQMNQ | Quotient of the long-term mean and mean low-flow discharge | 3.20 | 2.47 | 1.54 | 13.67 | – | – | |
Morphological degradation | HP1 | Channel development | 6.24 | 6.00 | 4.00 | 7.00 | 3 | 100% |
HP2 | Longitudinal profile | 5.38 | 5.00 | 3.00 | 6.50 | 3 | 96% | |
HP4 | Cross profile | 5.32 | 5.00 | 3.00 | 7.00 | 3 | 94% | |
HP5 | Bank structure | 5.68 | 6.00 | 3.00 | 7.00 | 3 | 96% |