Water quality index for river water assessment of Serang River Basin and Kulon Progo Regency, Yogyakarta

Abstract

Yogyakarta Province development in the past decade has been attracting many investors, especially in tourism and education sectors. This growth is resulted in large scale infrastructure constructions and increase of population. It causes higher waste production and may polluted the river water. Kulon Progo Regency is one of the regencies in Yogyakarta Province with vast infrastructure development for the last 4 years. Therefore, the research was carried out in Serang river basin and Kulon Progo Regency with the aim to assess the water quality. The method used was utilizing Water Quality Index (WQI) and Inverse Distance Weighted (IDW) interpolation using GIS software. TSS, temperature, DO, COD, TC and FC value had been utilized to assess the river water parameters. The result shows that from 2011-2018, rivers in Kulon Progo Regency is classified into three types: river water quality standard IV, standard III and Standard II. Further study should be performed to model the river water quality with different land use, pollution sources, and hydrological condition scenarios.