Assessment of River Water Quality and Pollution Status Using Physicochemical and Biometrics, Awetu River, Ethiopia

Table 2

Ranking of bio index values of benthic macroinvertebrates ((Restello, 2010), (Edia, 2009)).

No	H’	1-D	Ranking
1	>3.25	>0.90	Very light pollution
2	2.20-3.25	0.65-0.90	Light pollution
3	1.40-2.20	0.40-0.65	Low moderate pollution
4	0.80-1.40	0.25-0.40	High moderate pollution
5	0.10-0.80	0.10-0.25	Heavy pollution
6	<0.10	<0.10	Very heavy pollution

Notes: H’: Shannon-Wiener diversity index; D: Simpson dominance index.