You can calculate Water index using Water Quality Index (WQI). WQI uses factors specific weights to calculate water index.

Dissolved oxygen (0.17)

Fecal coliform (0.16)

pH (0.11)

Biochemical oxygen demand (0.11)

You can calculate Water index using Water Quality Index (WQI). WQI uses factors specific weights to calculate water index.

Dissolved oxygen (0.17)

Fecal coliform (0.16)

pH (0.11)

Biochemical oxygen demand (0.11)

Dear Harry,

Thanks a lot for your reply. Is it possible to help me to calcilate WQI?

With my best wishes!

Adel OUESLATI

Online calculators :

https://thewqiproject.org/calculator/

http://www.keithalcock.com/creeks/wqi.shtml

http://www.csgnetwork.com/h2oqualindextemponlycalc.html

Dear Dr. Aparna,

Thanks so much for the reply and the links.

With my best wishes!

edo.jrc.ec.europa.eu/documents/factsheets/factsheet_ndwi.pdf

I follow the link above.

thanks