Journal of Ecosystems

Research Article

Study on Freshwater Macroinvertebrates of Some Tanzanian Rivers as a Basis for Developing Biomonitoring Index for Assessing Pollution in Tropical African Regions

Table 3

Categorization of sites into different impairment levels based on B-IBI results.
B-IBI valueWater quality characterizationImpairmentSites fall at each impairment level
20–46Very poor to poorSevereU3, K1, R2, K2, R3, and K3
>46–72Fair to goodModerateU1, U2, and S3
>72–100Very good to excellentVery little to noneL1, L2, L3, R1, S1, and S2