Station 1 | Station 2 | Station 3 | |
Features of the reach | Constrained | Unconstrained | Unconstrained |
Riparian vegetation | Native | Native | Native |
Land use | Agriculture | Agriculture | Forestry/Agriculture |
Substrate type | Silt/Sand | Silt/Sand | Sand/Clay |
Canopy cover (%) | 60 | 60 | 70 |
Qualitaative habitat evaluation index (QHEI) | 80 | 54 | 67 |
pH | 7.23 ± 0.0095** | 7.075 ± 0.0126** | 6.96 ± 0.037** |
(7.2 - 7.26) | (7.04 - 7.12) | (6.8 - 7.02) | |
Electrical conductivity (µS/cm) | 111.6 ± 0.46** | 210.65 ± 0.41** | 106.95 ± 0.128452** |
(110 - 113.1) | (209 - 211.7) | (106.6 - 107.5) | |
Colour (Pt.Co) | 2.47 ± 0.147** | 5.51 ± 0.13** | 3.63 ± 0.20** |
(2 - 2.89) | (5 - 5.83) | (3 - 4.1) | |
Turbidity (NTU) | 15.38 ± 0.13** | 22.44 ± 0.11** | 14.44 ± 0.16** |
(15 - 15.76) | (22 - 22.7) | (14 - 14.86) | |
TSS (mg∙l−1) | 46.47 ± 0.51** | 52.37 ± 0.48** | 50.23 ± 0.46** |
(45 - 48) | (51 - 54) | (48.9 - 51.6) | |
TDS (mg∙l−1) | 56.42 ± 0.21* | 107.57 ± 0.29* | 53.67 ± 0.32* |
(55.8 - 57) | (107 - 108.8) | (52.7 - 54.6) | |
DO (mg∙l−1) | 6.63 ± 0.09** | 6.11 ± 0.02** | 6.39 ± 0.05** |
(6.4 - 7.01) | (6.02 - 6.17) | (6.3 - 6.6) | |
BOD5 (mg∙l−1) | 2.80 ± 0.03** | 2.70 ± 0.03** | 2.14 ± 0.03** |
(2.7 - 2.89) | (2.6 - 2.78) | (2.05 - 2.23) | |
COD (mg∙l−1) | 24.18 ± 0.18** | 14.37 ± 0.21** | 13.01 ± 0.07** |
(23.7 - 24.87) | (13.6 - 15.02) | (12.8 - 13.2) | |
NH4N (mg∙l−1) | 0.014 ± 0.002* | ND | 0.008 ± 0.0026* |
(0.01 - 0.02) | (0 - 0.015) | ||
NO2 (mg∙l−1) | 0.013 ± 0.002* | 0.05 ± 0.011* | 0.013 ± 0.0015* |
(0.01 - 0.02) | (0.02 - 0.09) | (0.01 - 0.02) | |
NO3 (mg∙l−1) | 0.03 ± 0.005* | 0.06 ± 0.0071* | 0.045 ± 0.006* |
(0.01 - 0.04) | (0.04 - 0.09) | (0.03 - 0.06) | |
Phosphate (mg∙l−1) | 0.64 ± 0.025* | 0.24 ± 0.02*` | 1.67 ± 0.14* |
(0.57 - 0.73) | (0.19 - 0.3) | (1.32 - 2.05) | |
Temperature (˚C) | 25.92 ± 0.36** | 25.74 ± 0.28** | 25.05 ± 0.31** |
(24.8 - 27) | (25 - 26.6) | (24 - 26) | |
Depth (m) | 0.28 ± 0.02** | 0.27 ± 0.02** | 0.30 ± 0.03** |
(0.24 - 0.35) | (0.23 - 0.34) | (0.25 - 0.4) | |
Flow velocity (m∙s−1) | 0.24 ± 0.04* | 0.11 ± 0.03* | 0.19 ± 0.06* |
(0.24 - 0.35) | (0.08 - 0.16) | (0.14 - 0.29) |