Assessement of Morphometric Characteristics of Riko Manggar Sub-Catchments to Identify the Soil Erosion Risk of Nusantara New Capital City, East Kalimantan, Indonesia

Abstract

Abstract Motivated by the critical condition in Jakarta, a new capital city called Nusantara in East Kalimatan has been prepared to answer this problem. Although it is prepared to be a sustainable green city, no city cannot evade from the ecological footprints. These activity could trigger a massive deforestation and forest degradation and also become a direct implication in soil erosion. Identification of area at risk of erosion and prioritizing it is necessary in the development and management progress of the city. Riko Manggar’s sub-watershed, where Nusantara is planned to be build, has 5 sub-catchments. Fortunately, Nusantara 0 km point has already placed in the lowest risk erosion area. Furthermore, it will be more convenient to expand the development to the west and east direction. Moreover, there is needed to make an erosion mitigation management before developing the upstream and downstream area.