How is Wqi value calculated?
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 the unit of Wqi?
The WQI was calculated using the weighted arithmetic water quality index method which was proposed by Horton (1965), developed by Brown et al. … The weightage unit (Wi) of each parameter was calculated a value inversely proportional to the standard of the World Health Organization (Si) World Health Organization, 2011.
What is Malaysia water quality Index?
Water Quality Index (WQI) – . 76.5 – 92.7.
Which river has lowest Wqi in Malaysia?
Ammonia-nitrogen (NH3-N) was identified as a major pollutant downstream from the Skudai, with the lowest WQI index (i.e. 38). WQI for the Skudai (natural) was 94, i.e., Class I (very clean) category of river water quality. The Senai River has WQI value of 85 and Class II category (slightly polluted).
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.
What does fair water quality mean?
WQI scores from 70-79 indicates fair or marginal water quality that sometimes exceeds guidelines, possibly by a wide margin. WQI scores below 69 indicate poor water quality that often exceeds guidelines by a wide margin.