Uncertainty and sensitivity analysis of West Java Water Sustainability Index – A case study on Citarum catchment in Indonesia

Abstract

Water sustainability indices have been recently used to measure the sustainability of water resources within a catchment. Developing a sustainability index involves various steps, some of which have uncertainties associated with them. For the recently developed West Java Water Sustainability Index (WJWSI), three sources of uncertainties were identified, namely uncertainties in the thresholds of noncategorical indicators and sub-indicators, in the weighting schemes, and in the aggregation methods. This paper presents the uncertainty and sensitivity analysis of WJWSI, based on the application of WJWSI to Citarum catchment in West Java, Indonesia. The results of the uncertainty analysis, measured by the coefficient of variation of the thresholds and the sub-indices, indicates that minimum thresholds of Land Use Changes, Coverage, Education, Poverty, Health Impact and Sanitation, and the maximum threshold of Water Quality have higher variation when compared to variation of the other thresholds. The results of the sensitivity analysis, measured by the correlation coefficients between the final index and the thresholds, indicate that changes in the thresholds of WJWSI indicators have not significantly affected the sub-index values of most indicators and sub-indicators. The sensitivity analysis also concluded that either the equal or non-equal weighting scheme can be used for future use of the aggregation of WJWSI indicators and sub-indicators, as changes from equal to non-equal weighting scheme did not significantly affect the final index. However, it was found that the final index values were most sensitive to the aggregation method used (i.e. arithmetic and geometric methods), shown by the significant changes in the final index value when the aggregation method was changed from arithmetic to geometric. The uncertainty and sensitivity analysis presented in this study will not just assist in the efficient use of the WJWSI, but will also help undertake similar analysis for other indices.

BOD Pressure in the sustainability of the Citarum River

“…In everyday life humans are also not separated from to meet their daily needs, such as eating, drinking, washing and others. Therefore, it is of utmost importance to maintain the sustainability of water resources, so that these resources can be utilized by humans and others, now and also in the future [22]. The world is currently faced with SDGs (Sustainable Development Program).…”

Application of west java water sustainability index to three water catchments in west java, Indonesia

“…Because of this advantage of the geometric aggregation method over the other aggregation methods, this method was used to aggregate the WJWSI indicators and sub-indicators . As far as the weighting is concerned, the uncertainty and sensitivity analysis of WJWSI (Juwana et al, 2016) showed that either equal or non-equal weighting scheme can be used for future use of WJWSI, since changes from equal to non-equal weighting scheme did not significantly affect the final index. Thus, the application of WJWSI to the three catchments presented in this study uses the equal weighting scheme.…”

The improvement of solidwaste management in Cibodas Botanical Garden through environmental economic valuation using the travel cost method

“…= 558,427 1 + 558,427 0.08 2 = 156 respondents Sugiyono [13][14][15][16] stated that Slovin formula allows the maximum of 10 % error threshold. Thus, the use of 8 % in this study for the error is justified.…”