KAJIAN PERUBAHAN GUNA LAHAN DAN LIMPASAN AIR PERMUKAAN, SERTA IMPLIKASINYA TERHADAP KEBIJAKAN TATA RUANG (STUDI KASUS: SUB – DAS CIRASEA, KABUPATEN BANDUNG)

• Main Author: Atharinafi, Zahrul
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/46296
• Institution: Institut Teknologi Bandung

In addition to factors relating to soil infilteration capacity and changes in rainfall, land use change in environmentally sensitive upstream regions of watersheds have been known to significantly influence surface runoff. An increase in surface runoff increases flood occurrence and intensity. Flooding negatively impacts the socioeconomic condition of those impacted directly by it. Therefore, this study will attempt to connect spatial land use change patterns and changes to surface runoff patterns between 1998 and 2018, in addition to land use policy implications. Data for this study were collected from relevant government institutions. Spatial analytics were used to analyze land ue change patterns, whereas changes in surface runoff were identified using the SCS – CN (curve number) method. This study found an increase in runoff levels within the Cirasea subwatershed, increasing from 48.49mm (1999) to 51.81mm (2018). This increase in surface runoff was found to be the result of land use change in the form of deforestation; whereby a change in land use from forest land into agricultural uses were idenfitifed. According to the 2016 – 2036 Regional Land Use Plan (Kabupaten Bandung), areas where deforestation driven land use change were identified, are largely in areas zoned for conservation purposes in the form of protected forest land. Therefore, it can be concluded that increases in surface runoff as happened in the Cirasea subwatershed to be caused by land use violations upstream. It is therefore necessary to return formerly forested land into forested land. Agroforestry is a known viable alternative that could be recommended in order to return agricultural land back to its previously forested state. By applying agroforestry, agricultural activities could continue, while maintaining ecological functions related to forested lands, including runoff control.