Objective: Water quality monitoring has been high priority to determine the current conditions
of the water system. The present study evaluates the surface water quality in terms of the physicochemical
parameters of the Brari-Nambal lagoon of Dal Lake, Kashmir.
Method: Various physico-chemical parameters of water samples for the Brari-Nambal lagoon of the Dal
Lake were determined post September 2014 floods in Kashmir. The values of physico-chemical parameters
in the lake water samples were compared with those of World Health Organization (WHO)
guideline. For the evaluation of the huge obtained data set, various robust statistical techniques like statistical
interpretation for finding p value and Standard Ion Index (SII) which gives the interpretation of
the cation and anion concentration by involving the standardization in statistics. Data treatment by
mathematical methods was also done to get the results in a better and structured way.
Result: Water Quality Index (WQI) was very poor and water quality falls under grade ‘D’ with values
>75. Permeability Index (PI) value was 27.94 before floods and hence fit for irrigation and 24.98 after
floods thereby unfit for irrigation. Kelly’s ratio remains <1 throughout and hence fit for irrigation. Sodium
Adsorption Ratio (SAR) remains <10 and therefore fit for irrigation. Magnesium Hazard (MH) values
were calculated and remained < 50 and hence an indication for fit water for irrigation purposes.
Keywords: Water quality, metal ions, Brari-Nambal lagoon, carbonates, salts, statistical techniques.
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