How do you calculate Wqi?

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

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

What is a good Wqi?

WQI scores from 80-100 indicate high water quality, meaning that water quality rarely exceeds guidelines, and if so, only by a narrow margin. WQI scores from 70-79 indicates fair or marginal water quality that sometimes exceeds guidelines, possibly by a wide margin.

What does Wqi measure?

The Freshwater Quality Index, sometimes called the WQI, summarizes and presents water-quality data as a number ranging from 1 to 100, with a higher number indicating better water quality.

How is Wqi calculated Malaysia?

WQI = 0.22(siDO) + 0.19(siBOD) + 0.16(siCOD) + 0.15(siAN) + 0.16(siTSS) + 0.12(sipH) 621 Page 3 siDO-subindex is for dissolved oxygen, siBOD-subindex is for biochemical oxygen demand, siCOD-subindex is for chemical oxygen demand, siAN-subindex is for ammoniacal-nitrogen, siTSS-subindex is for total suspended solid.

Who BIS standards for drinking water?

If any parameter exceeds the limit, the water is considered unfit for human consumption….BIS Standards Set for drinking water quality.

Test parameter Acceptable limit Permissible limit (In the absence of alternate source of water)
pH value 6.5-8.5 No relaxation
Turbidity 1 5
Total hardness as CaCo3, mg/l, Max 200 600

What is water quality index PDF?

The index takes into. account nine water quality parameters: Dissolved oxygen, Faecal coliform, pH, BOD, Temperature difference (1 mile), Total phosphate, Nitrate, Turbidity and Total solids. Water is graded for its quality from the worst to best on a scale of 0 to 100.

Who developed Wqi?

Horton 1965 [10] initially proposed the WQI and since then many different methods of WQI’s calculation can be found in the literature.

How do you measure water quality parameters?

7 Ways to Measure, Monitor, and Evaluate Water Quality

  1. CDOM/FDOM Monitoring.
  2. Chlorophyll Fluorescence Analysis.
  3. Conductivity, Salinity, and TDS Monitoring.
  4. Recording the Water Temperature.
  5. Measuring the Dissolved Oxygen Levels.
  6. pH and KH Testing.
  7. Assessing the Turbidity, TSS and Clarity.

What is Wqi Malaysia?

Water Quality Index (WQI)

What is the standard water hardness in Malaysia?

Drinking water with pH 6.5 – 8.5 is generally considered as satisfactory level as per standards of Malaysia food Act (WHO 2017). Hardness is a measure of the content of calcium and magnesium in water. Public acceptability of the degree of total hardness of water may vary considerably from one country to country.