Ganges water quality Hi ...

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Ganges water quality

Hi Vidhya
It never ceases to amaze me how respondents will talk around the subject without answering the question!
The UK Environment Agency has a sophisticated system for reporting on river quality which has six grades from A to F. They consider a range of parameters but the main one is the diversity of species which live in the river.
I prefer the system used in asset management which has five grades:
1=excellent: Very wide range of species; no pollution ever
2=good: wide range of species, only slight occasional pollution
3=adequate: typical pollution resistant species, occasional pollution
4=poor: only pollution tolerant species, regular pollution
5=awful: very little life at all, constantly polluted.

These grades can be subdivided if required.