Table 3 Mean values of water quality indicators in the sub-watersheds in different seasons
From: Assessing the impact of watershed land use on Kebena river water quality in Addis Ababa, Ethiopia
Variable | Forest dominated (Little-Kebena) | Agriculture dominated (Denkaka) | Urban dominated (Ginfle) | Entire Kebena watershed | F Value (Dry) | Sig. (Dry) | F Value (Wet) | Sig. (Wet) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
dry | wet | dry | wet | dry | wet | dry | wet | |||||
PH | 8 | 5.92 | 8.08 | 5.64 | 7.65 | 6.64 | 7.77 | 6.71 | 6.98 | 0.001** | 12.48 | 0.000** |
TDS mg/l | 885 | 170 | 917 | 279 | 921 | 362 | 877.00 | 209.00 | .83 | .486 | 35.87 | 0.000** |
TSS mg/l | 56 | 150 | 36 | 81 | 339 | 72.5 | 193.00 | 102.00 | 25.56 | 0.000** | 22.77 | 0.000** |
EC | 1766 | 339 | 1831.6 | 235.2 | 1853 | 784.7 | 1754.15 | 419.10 | 2.46 | .079 | 122.51 | 0.000** |
Ammonia, mg/l | 49.5 | 2.51 | 65 | 0.75 | 138.1 | 18.25 | 84.55 | 5.00 | 32.94 | 0.000** | 648.15 | 0.000** |
T-N, mg/l | 42.45 | 4.1 | 54 | 3 | 129 | 10 | 78.00 | 8.10 | 25.77 | 0.000** | 47.05 | 0.000** |
T- P, mg/l | 4.3 | 0.12 | 4.4 | 0.37 | 16.09 | 1.55 | 8.16 | 0.15 | 11.58 | 0.000** | 46.65 | 0.000** |
Chloride, mg/l | 94.22 | 44.25 | 102.83 | 36.61 | 79.2 | 78.8 | 74.59 | 48.00 | 35.66 | 0.000** | 110.34 | 0.000** |
COD, mg/l | 46 | 39 | 34 | 55 | 157 | 114 | 161.90 | 44.00 | 353.01 | 0.000** | 165.74 | 0.000** |
BOD, mg/l | 40.2 | 10.2 | 23 | 11.9 | 12.1 | 63 | 183.20 | 16.00 | 754.83 | 0.000** | 287.12 | 0.000** |