Question

collect data of major river systems in india on the basis of their pollution level present data by using different statistical tools

Answer 1

the following data may be a bit old... the data may be presented using histograms.

Sabarmati :  4 mg/L  or BOD
BOD : biochemical oxygen demand.
In 2010 the statistics are:
          Markanda:   590 mg Oxygen /liter    BOD
          Amlakhadi :  353
             Kali:  364
         Yamuna canal:  247  BOD
          Yamuna  near Delhi:  70
          Betwa:   58
The above are the worst affected.  Near cities and major towns the rivers are badly affected.  In rural areas they are better.
BOD levels of 8 mg/L  or less is acceptable... below 2 mg/L is good water.          
 
Ganga :   at Rishikesh 1.5  mg  Oxygen/L.                   at  kanpur : 5 mg/L
Brahmaputra:    At gauhati  - very high.      at other locations  : 2 mg /L  or less

Tapi :  2 mg/L  in some areas.    in cities and towns,  about 13 mg/L   BOD
Narmada  : less than 2.5 mg/L  BOD
Mahanadi  :   less than  1 mg O / Litre   to   4  in cities or chattisgarh
Krishna:   1 to 3   in many areas...    10 in many cities/towns....     Around Pune: 28 mg/L
Cauvery :    generally from 1 mg/L  to  3 mg/L

Ganga :  4 - 8  mg / liter  BOD
Godavari :  5 BOD
Vitharini (Bitarni) :  2 mg/l
Narmada : 2 mg/l
Mahi : 2.5 mg//l