Study on the Impact of Land Use Changes Caused by IKN Development on Sanggai River Flood Discharge

¹ Magister Study Program of Water Resource Management, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Bandung, Indonesia
² Water Resources Engineering Research Group, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Bandung, Indonesia
³ Senior Researcher at the Hydrology and Water Resources, Ministry of Public Works and Housing, Jakarta, Indonesia

^* Corresponding author: fredyriandys@pu.go.id

Abstract

In 2019, President Joko Widodo implemented a political policy to relocate the capital of the Republic of Indonesia from DKI Jakarta to Penajam Paser Utara Regency and Kutai Kartanegara Regency. Construction has commenced and will be executed in several stages until 2045. The primary development stage will concentrate on the Central Government Core Area (KIPP). The relocation of the National Capital poses several potential problems, one being the risk of inundation and flooding. The government aims to minimize this risk by creating green areas covering up to 70% of the total area of IKN. Additionally, the government is constructing flood control infrastructure, including retention ponds, check dams, bottom controllers, and other structures. One of the rivers that flows through KIPP is the Sanggai River, covering a catchment area of 19.3 km2 with a river length of 9.8 km. This research will discuss the impact of IKN development on the Sanggai River Catchment Area, focusing on proposed changes in land use and alterations in flood discharge within this river. Furthermore, the study will investigate the influence of constructing flood control buildings (retention ponds and bottom controllers) using modeling on HEC-RAS. The objective of this research is to assess the effectiveness of flood control structures and estimate the potential for flood inundation.