Water quality is directly
related to physio-chemical, biological and radiological properties of water
.These properties are affected due to various human activities .Primarily, WQI
was developed by Horton (1965) in united states by selecting 10 most commonly
used water quality variables like dissolved oxygen (DO), PH, Coliforms,
Specific Conductance, alkalinity and Chlorides etc. and has been widely applied
and accepted in European, African and Asian.
“Water is one of the most
important natural resources which is necessary for the sustenance of life on
the earth .The rapidly increasing population and industrialization increase the
demand and reduces the quality of water day by day .The quality of water draws
the attention of various scientists and researchers, as the reduction in water
quality becomes a great threat to the sustainability of life on the earth.
Water quality is an
important factor to predict environmental changes, which are strongly
associated with social and economic development. The evaluation of water in the
developing countries has become a critical issue in recent years, especially
due to the concern that fresh water will be scare in near future. Water from a
certain source may be good enough for drinking without any treatment but it may
not be suitable as a coolant in an industry. It may be good for irrigating
certain crops but not for certain other crops.
Now days the problem of
drinking water contamination, water conservation and water quality management
become very important 1. For the water quality management WQI is of great
importance and various parameters get selected depending upon the intended use
of water. Generally it is done based on the need of human consumption 2-4.
Water Quality Indices (WQI) is a tool to summarize large amounts of water
quality data into more simple terms for the better understanding about the
quality of that particular water sample 5-9.