Volume No. 9 Issue No.: 3 Page No.: 585-594 January-March 2015

 

A NEW WATER QUALITY INDEX FOR IRRIGATIONAL USE AND WATER QUALITY ASSESSMENT OF THE SATLUJ RIVER, PUNJAB, INDIA

 

Sharma Siddhartha*, Reddy S. Akepati 1 and Dalwani R. Roop2

1. School of Energy and Environment, Thapar University, Patiala, Punjab (INDIA) 2. National River Conservation Directorate, Ministry of Environment and Forests, New Delhi (INDIA)

 

Received on : September 10, 2014

 

ABSTRACT

 

Use specific Water Quality Index for Irrigational use (WQII) has been developed and water quality of Satluj river has been evaluated. Water quality parameters have been grouped in two sub-indices categories: general parameters (SIgp) and heavy metals (SIhm). General water quality parameters include 12 variables: Sodium Absorption Ratio, Total Dissolved Solids, Conductivity, BOD5, Chloride, Fecal coliform, COD/BOD5 ratio, Boron, Total-N, pH, iron and fluoride. Open ended list of heavy metals has been considered. Since no standard limits exist against pesticides group of parameters, hence not considered for inclusion in the indexing. Relative weights assigned to the general parameters through expert opinion analysis by pair-wise comparison of the parameters and SIgp was calculated by weighted root sum function. One metal, from the big list of heavy metals whichever is at highest concentration ratio in the water, has been considered as maximum operator sub-index (SIhm). Transformation curves for each of the parameters were developed while using the water quality criteria and standards as the basis. Overall WQII has been obtained by geometric mean of all the sub-indices and multiplied by 100.

 

Keywords : Water Quality Index, Irrigational use, Pair-wise comparison, Maximum operator, Transformation equation, River Satluj

 

 

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