Seasonal Dynamics in Bacteriological and Physicochemical Water Quality of the Southern Gulf of Lake Tana

Table 5

Water quality index (WQI) calculated for the sampled sites at the Southern Gulf of Lake Tana using both bacteriological (coliforms) and physicochemical parameters, 2021.

Major site categories	Site	Season	WQI	Category
Impacted sites	1	Dry
		Wet	70.7
		Combined	68.5	Fair
	2	Dry
		Wet	70.2
		Combined	68.6	Fair
	3	Dry
		Wet	70.8
		Combined	57.6	Marginal
	4	Dry
		Wet	66.5
		Combined	56.6	Marginal
Reference sites	5	Dry
	5	Wet
	5	Combined	78	Fair
	6	Dry
	6	Wet
	6	Combined	67.06	Fair
	7	Dry
	7	Wet
	7	Combined	67.5	Fair
	8	Dry
	8	Wet
	8	Combined	66.1	Fair
Impacted sites combined	1 to 4	Dry	76.2	Fair
	1 to 4	Wet	53.3	Marginal
Reference sites combined	5 to 8	Dry	95	Excellent
	5 to 8	Wet	69.4	Fair
All sites combined	1 to 8	Dry	78.4	Fair
	1 to 8	Wet	64.4	Marginal