Water Quality Monitoring and Evaluation in the Bengawan Solo River Region

Abstract

Abstract The Bengawan Solo River Region with an area of 19,778 km2 consists of 96 watersheds with four main watersheds, namely the Bengawan Solo watershed with an area of 15,295.69 km2, which has a main river, the Bengawan Solo River which flows from Wonogiri to the downstream area on the north coast of Gresik Regency, Grindulu Lorog Watershed with 1,040,656 km2 area, Corong watershed with an area of 815,081 km2, and Lamong watershed with an area of 760,292 km2. Bengawan Solo River crosses various areas both natural and cultivated areas including forests, rice fields, to settlements and industries, causing changes in water quality from upstream to downstream. The purpose of this study was to determine the level of pollution in the Bengawan Solo River Region from upstream to downstream. This research method is to analyze the parameters of the results of testing water quality samples at several points with the Pollution Index method for second grade water quality then spatially analyzed. The results showed that of the 29 monitoring points of river water quality in the Bengawan Solo River Region, 17% were heavily polluted, 59% were moderately polluted, 24% were light polluted, and 0% were meeting quality standards. Therefore, efforts are needed to manage the river based on its water quality by maintaining the capacity of the river against pollution loads that can be received by water bodies.