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Application of Water Quality Indices and Dissolved Oxygen as Indicators for River Water Classification and Urban Impact Assessment

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Abstract

The usefulness of water quality indices, as the indicators of water pollution, for assessment of spatial–temporal changes and classification of river water qualities was verified. Four water quality indices were investigated: WQI (considering 18 water quality parameters), WQImin and WQIm (considering five water quality parameters: temperature, pH, DO, EC and TSS) and WQIDO (considering a single parameter, DO). The water quality indices WQImin, WQIm and WQIDO could be of particular interest for the developing countries because of the minimum analytical cost involved. As a case study, water quality indices were used to evaluate spatial and temporal changes of the water quality in the Bagmati river basin (Nepal) for the study period 1999–2003. The results allowed us to determine the serious negative effects of the city urban activity on the river water quality. In the studied section of the river, the water quality index (WQI) was 71 units (classified as good) at the entry station and 47.6 units (classified as bad) at the outlet station. For the studied period, a significant decrease in water quality (mean WQI decrease = 11.6%, p = 0.042) was observed in the rural areas. A comparative analysis revealed that the urban water quality was significantly bad as compared with rural. The analysis enabled to classify the water quality stations into three groups: good water quality, medium water quality and bad water quality. WQImin resulted in overestimation of the water quality but with similar trend as with WQI and is useful for the periodic routine monitoring program. The correlation of WQI with WQImin and DO resulted two new indices WQIm and WQIDO, respectively. The classification of waters based on WQIm and WQIDO coincided in 90 and 93% of the samples, respectively.

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Correspondence to Prakash Raj Kannel, Seockheon Lee or Sushil Raj Kanel.

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Kannel, P.R., Lee, S., Lee, YS. et al. Application of Water Quality Indices and Dissolved Oxygen as Indicators for River Water Classification and Urban Impact Assessment. Environ Monit Assess 132, 93–110 (2007). https://doi.org/10.1007/s10661-006-9505-1

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  • DOI: https://doi.org/10.1007/s10661-006-9505-1

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