Changes in the Land Use Pattern of the Parat River Subwatershed, Salatiga, Central Java

Abstract

Rawapening Lake is one of the 15 national priority lakes and a pilot project of the GERMADAN (Gerakan Penyelamatan Danau) Indonesian. The main problems of Rawapening are eutrophication and sedimentation from water catchment area (agriculture, livestock, domestic and industrial waste) and from the water body itself with various changes in land use patterns that occur in the surrounding rivers. Parat River is one of 9 rivers that empties into Rawapening. This study aims to analyze patterns of land use change in the Parat River sub-watershed in the last 25 years, using geographic information systems (GIS) remote sensing applications. The time series used were 1994, 2000, 2003, 2009, 2014 and 2018. The data was interpreted based on the types of land cover and how the changes occurred during that time period. There are seven types of land cover identified in this study. The area increases of plantation land types (1.12%) and built-up land (5.69%), is in line with the decrease in the area of Rice field type (7.78%), savanna (0.44%), swamp grass (0.40%), open land (0.25%) and body of water (0.01%). Changes in the pattern of land use in the Parat River Sub-watershed, in line with the increase in the amount of contamination carried and then will affect the lake where it empties, which is Rawapening.