Table 1 Mean values and range of physicochemical variables at the two studied sites (Northwestern Patagonia Argentina)
| Â | Nanty Fall | Chiquito | ||
|---|---|---|---|---|
| Â | Pre-eruption | Post-eruption | Pre-eruption | Post-eruption |
Water temperature (°C) | 11.6 (3.9 to 22.5) | 12.6 (5.3 to 20.8) | 8 (2.4 to 13.1) | 7.6 (2.7 to 12.6) |
Channel wetted width (m) | 17.1 (14 to 22.7) | 22 (18.2 to 27) | 2.7 (2 to 3.1) | 2.2 (1.5 to 2.5) |
Channel dry width (m) | 31.5 | 31.5 | 3.5 | 3.5 |
Depth (cm) | 20.9 (15.6 to 32.6) | 29 (19.5 to 38.4) | 12.7 (9 to 20) | 12.4 (7.9 to 17.7) |
Current velocity (m/seg) | 0.7 (0.5 to 1.16) | 0.7 (0.5 to 0.8) | 0.7 (0.4 to 1.18) | 1 (0.6 to 1.6) |
Discharge (m3/seg) | 3.2 (1.31 to 7.21) | 4.1 (2.31 to 4.7) | 0.2 (0.1 to 0.6) | 0.3 (0.1 to 0.5) |
Conductivity (μS/cm) | 89.7 (72.3 to 119.4) | 94.6 (76.3 to 107.8) | 52 (29.4 to 104.7) | 55.3 (42.8 to 73.2) |
Dissolved oxygen (mg/l) | 9.7 (7.06 to 13.23) | 10.5 (7.7 to 12.7) | 7.2 (7.2 to 15.4) | 10.3 (6.6 to 13.7) |
pH | 7.6 (6.5 to 8.5) | 7.6 (6.4 to 8.6) | 7.3 (6.8 to 8) | 7.3 (6.2 to 8.1) |
Total suspended solids (mg/l) | 2.7 (1.7 to 3.6)a | 10.25 (7 to 13.5) | 4 (2 to 6.1)a | 12.8 (1.3 to 24.1) |