How do you calculate water quality index?

The WQI is calculated by averaging the individual index values of some or all of the parameters within five water quality parameter categories:

Water clarity: turbidity (NTU*) and/or Secchi disk depth (meters or feet);
Dissolved oxygen: Dissolved oxygen concentration (mg/l);

What is water quality Index Method?

The NSF WQI was developed to provide a standardized method for comparing the water quality of various water sources based upon nine water quality parameters, i.e., temperature, pH, dissolved oxygen, turbidity, fecal coliform, biochemical oxygen demand, total phosphates, nitrates and total solids.

How is water quality index calculated in India?

Water quality index is calculated from the point of view of suitability of groundwater for human consumption. The chemical analyses of the groundwater and the percent compliance with the Indian Standards7 and WHO8 are summarized in Table 1.

What is the index of water pollution?

Water pollution index (WPI) The proposed index, WPI is based on the standard permissible limits of groundwater parameter recommended by the BIS and WHO. In this study, WPI for each sample was calculated to evaluate the degree of pollution in groundwater for drinking purpose using 19 water quality parameters (n = 19).

How many Wqi tests are there?

nine tests
This index, known as the Water Quality Index, or WQI, consists of nine tests to determine water quality. These nine tests are: temperature, pH, turbidity, total solids, dissolved oxygen, biochemical oxygen demand, phosphates, nitrate, and fecal coliform.

What is water quality index of India?

When around 600 million Indians are undergoing extreme water stress, three-fourth of households do not get drinking water, and when 70 per cent of the water is contaminated, it doesn’t come as a surprise that among 122 countries India stands 120th on the water quality index.

What is Q value in water quality index?

A Q-value is a way of standardizing all the different water quality test results so that they can be combined and used to find an overall water quality value for the river. You can think of the Q-value like a score on a test. Less than 50 is like a failing grade, whereas 90 or more is like an “A.”

WHO publishes water quality?

As the principal United Nations body on environment, the UN Environment Programme (UNEP) had been tasked by UN-Water to lead on freshwater quality and aquatic ecosystem data and information inputs to the World Water Assessment Programme, and the main WWAP output, the World Water Development Report series.

What is the rank of India in water pollution?

120th among
At the national level, the Composite Water Management Index (CWMI) of Niti Aayog has confirmed that 70 percent of India’s water supply is contaminated. Globally, India is ranked 120th among 122 countries in WaterAid’s water quality index.

How is the water quality index ( wqi ) calculated?

IRL Health Update, marine science The Water Quality Index (WQI) uses the four water quality indicators: chlorophyll-a, TN, TP, and turbidity. The WQI was calculated for each sublagoon area by converting annual offsets to a percentage scale, resulting in a final score ranging from 0% to 100%.

How to calculate water quality index-ResearchGate?

Where qi is the quality rating, Ci is the concentration of each selected parameter from water sample in mg/L, and Si is the WHO Standard of drinking water for each selected parameter in mg/L, according to the guidelines of WHO for computing the WQI.

How is the NSF water quality index calculated?

Water quality index is a 100 point scale that summarizes results from a total of nine different measurements when complete: dissolved oxygen fecal coliform pH biochemical oxygen demand temperature change total phosphate nitrates turbidity total solids