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