What is water quality Index Method?
Definition. A critical water quality index (WQI) method has been used to determine the overall water quality status of surface water and groundwater systems globally since the 1960s. WQI follows four steps: parameter selection, sub-indices, establishing weights, and final index aggregation.
How do you calculate water quality index example?
Computation of WQI: The WQI is computed following the three steps. First step – Assigning of weight (wi) to the selected water parameters (e.g., pH, TDS, TH, HCO3, Cl, SO4, NO3, Fe, ……) according to their relative importance in the overall quality of water for drinking purposes (weight may be from 1 to 5).
What is the importance of water quality index?
Water quality indices provide a way to distill thou- sands of records of environmental data into meaningful values that indicate the health of water resources and create a yardstick for measuring and assessing water quality.
Who is Wqi?
Water Quality Index (WQI) is considered as the most effective method of measuring water quality. A number of water quality parameters are included in a mathematical equation to rate water quality, determining the suitability of water for drinking .
WHO releases water quality index?
Nature of Water Crisis India ranks 120 among 122 countries on the Water Quality Index released by WaterAid.
What is the range of water quality index Wqi for excellent water?
89.21 to 660.56
In this study, the computed WQI values ranges from 89.21 to 660.56 and therefore, can be categorized into five types “excellent water” to “water unsuitable for drinking”. Table 4 shows the percentage of water samples that falls under different quality.
What is quality index mark?
It is said that the basis of Quality Index is Average marks scored by school students as per CBSE 2018 results of Delhi schools. As per the quality index, Mothers International school in Aurobindo Marg tops the list with average of approximately 447 marks out of 500 i.e. approximately 89.4%.
Which country has the best quality tap water?
Switzerland is repeatedly recognized as a country with the best quality tap water in the world. The country has strict water treatment standards and superior natural resources with an average rainfall per year of 60.5 inches. In fact, 80% of the drinking water comes from natural springs and groundwater.