THE DEVELOPMENT OF WATER QUALITY INDEX AS AN ALTERNATIVE ASSESSMENT OF RIVER WATER QUALITY

Abstract

Development of Water Quality Index (WQI) as a result of NSF-WQI modification is an advanced design process of WQI that has been carried out in 2016. The progress of IKA was determined through verification of the constituent component of WQI, comprising sub index curve, parameter weighting, and field verification of WQI formulation results. Field verification was conducted at eight locations of the Ciliwung River. The results indicated that the WQI score obtained from the water quality testing result in the laboratory and field verification results by panelists conducted at the same time indicated a value that was not significantly different, so that the WQI formulation has been developed as appropriate for the Ciliwung River assessment. The value of WQI developed into six criteria which is very good (100≤ I>90), good (90≤ I ≥80), good enough (80<I ≥70), medium (70<I ≥51), marginal (51<I≥36), and bad (36<I ≥0). The result of IKA application shows that one of the Ciliwung River springs located on the slopes of Mount Pangrango has a value of 91 which is within very good criteria. Condet River categorized as one of the Ciliwung creeks with high domestic pollutants, has a value of 35.5 which is display bad criteria. Six other Ciliwung River locations are on marginal to good criteria. WQI formulation that has been obtained can be applied as the instrument of river assessment and the results can be used for planning and evaluation of river water contamination control. Keyword : Water quality index (WQI), verification, sub index curve, parameter, weighting, Ciliwung River