Analysis of land use patterns in the upper Cimanuk river basin and its relationship with irrigation water discharge in Majalengka Regency, Indonesia

Abstract

Land use with increasingly high intensity and not well planned, such as land conversion from agricultural land to residential and industrial areas has the potential to cause damage to watersheds indicated by a decrease in hydrological conditions. This land use change is an important phenomenon for every planner and regional policy maker. This research wa conducted for seven months at the Cimanuk River Basin. This study aims to determine the pattern of land use in the Uppe Cimanuk Watershed and the impact of land use in the Upper Cimanuk Watershed on irrigation water discharge in Majalengka Regency. The research method in this study used the image classification method, namely the process of dividing the coverage area based on image data with the use of certain symbols. In it there was an unsupervised classification and a guided classification. The results showed that Land use patterns in the Cimanuk River Basin are dry land agriculture by 30.02%, rice fields by 19.01%, production forest by 14.34%, and bush area by 0.32%. The average annual discharge in 2020 in the upstream of the Cimanuk River Basin that flows into the Rentang and Kamun dams were 125.32 m/s and 355 m/s.