Research Article
Water Hyacinth’s Extent and Its Implication on Water Quality in Lake Victoria, Uganda
Table 4
Summary statistics for water quality parameters in the open lake and hyacinth-infested areas.
| Water hyacinth environment statistics | pH | EC (mS/cm) | Turbidity (NTU) | COD (mg/L) | TP (mg/L) | BOD (mg/L) | Temp (OC) | DO (mg/L) | Transparency (meters) |
| No. of observations | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | Minimum | 5.5 | 102.1 | 6.05 | 16.0 | 0.2 | 17 | 24.1 | 5.3 | 0.1 | Maximum | 7.6 | 313 | 544 | 155 | 8.3 | 48 | 42 | 9 | 1 | 1st quartile | 6.2 | 122 | 54.4 | 56 | 2.5 | 28 | 25 | 6.5 | 0.3 | Median | 6.7 | 132.9 | 59.6 | 70 | 3.2 | 35 | 25.4 | 7.0 | 0.4 | 3rd quartile | 7.1 | 160.2 | 63.3 | 96.8 | 3.3 | 38.1 | 26.3 | 7.4 | 0.5 | Mean | 6.7 | 146.8 | 66.3 | 77.2 | 3.7 | 32.9 | 27 | 6.9 | 0.4 | Variance | 0.3 | 1870.8 | 3643.3 | 867 | 1.6 | 54 | 20 | 0.5 | 0.1 | Standard deviation (n-1) | 0.6 | 43.3 | 60.4 | 29.4 | 1.2 | 7.3 | 4.5 | 0.7 | 0.3 |
| Open lake environment statistics | pH | EC (mS/cm) | Turbidity (NTU) | COD (mg/L) | TP (mg/L) | BOD (mg/L) | Temp (OC) | DO (mg/L) | Transparency (meters) |
| Minimum | 7.3 | 99.7 | 29.1 | 17 | 0.1 | 3.0 | 0.10 | 6.7 | 0.1 | Maximum | 10.8 | 408 | 59 | 211 | 4.1 | 30 | 41 | 10.9 | 1.1 | 1st quartile | 7.9 | 125.2 | 45.6 | 51 | 1.1 | 19.2 | 24.7 | 8.0 | 0.4 | Median | 8.4 | 132.3 | 48.3 | 55.5 | 1.4 | 23.2 | 25.2 | 8.5 | 0.6 | 3rd quartile | 8.7 | 153.3 | 52.8 | 63.8 | 1.8 | 25.7 | 26 | 9.2 | 0.9 | Mean | 8.5 | 142.3 | 48.1 | 62.9 | 1.4 | 21.8 | 25.7 | 8.6 | 0.6 | Variance | 0.6 | 1752.5 | 38.2 | 909.2 | 0.6 | 39 | 26.6 | 0.9 | 0.1 | Standard deviation (n-1) | 0.8 | 41.9 | 6.2 | 30.2 | 0.8 | 6.2 | 5.2 | 0.9 | 0.3 |
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