**3.6 Biological index-based water body classification**

Water body classification is now a function of water chemistry, biological, and hydrological characteristics as it is necessary to include pollutant effects on biota since the nature of the receiving waters influences the effect on water quality as seen in **Figure 4**. Also, river water is classifiable on the basis of biology, hydrology, and quality, into different condition ecological categories in the qualitative scale of bad, poor, moderate, good, or high [8].


**Table 2.** *Algae community types [308, 310].*

*Monitoring of Rivers and Streams Conditions Using Biological Indices with Emphasis on Algae… DOI: http://dx.doi.org/10.5772/intechopen.105749*

### **Figure 4.**

*Water body classification employing ecological models biological indices, and adaptive management.*
