STUDY OF LAND USE CHANGE ON SURFACE RUNOFF AND ITS IMPLICATIONS ON SPATIAL PLANNING POLICY IN THE CILIWUNG HULU SUB-WATERSHED, BOGOR REGENCY

• Main Author: Marchelino, Christian
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/64917
• Institution: Institut Teknologi Bandung

Flood cases due to Ciliwung River overflow in DKI Jakarta are caused by multiple factors. Land use change in the upstream region which function as a catchment area, is one of those factors. This land use change may impact the surface runoff collected in the downstream region. Therefore, this study tried to identify the trend of land use change and its impact on surface runoff from 2000 until 2019, as well as its implication on spatial policy in Ciliwung Hulu Sub-Watershed, Bogor Regency. In this study, various secondary data were collected from relevant agencies, to do spatial analysis and SCS-CN (Soil Conservation Service - Curve Number) analysis that ties land use change with surface runoff. The analysis results show that surface runoff in Ciliwung Hulu Sub-Watershed has increased from 87,08 mm (2000) to 92,45 mm (2019). Two types of land use that have the biggest impact on the surface runoff are residential settlement and industry. Responding to this matter, central policies have included land use supervision and control as one of the efforts to be made. However, it would be best if these policy directly address industry as one of the land use that need to be tightly monitored in the upstream region and agroforestry as a watershed conservation effort. On the other hand, in the 2016-2036 Bogor Regency’s Regional Land Use Plan, industrial land use was not planned to develop in Ciliwung Hulu Sub-Watershed. While in reality, the industrial land use already exist. Even more, the residential settlement planned area is larger than the ones that exist in 2019. Upon this matter, the supervision and control towards both types of these land use need to be tightened up. Aside that, agroforestry system may be applied on the existing plantation in order to increase Ciliwung Hulu Sub-Watershed protection function. By doing these steps, the surface runoff generated in Ciliwung Hulu Sub-Watershed is expected be suppressed or reduced in the future.