DEVELOPMENT OF GREEN INFRASTRUCTURE IN URBAN CATCHMENT AREA (CASE STUDY: TANJUNG BARAT SUB-DISTRICT, SOUTH JAKARTA)

Abstract

The rapid urbanization of the city of Jakarta has resulted in the decreasing of the hydrological function of the city due to the increase of impervious land cover and the reduced water catchment area. Water conservation efforts are needed by increasing water infiltration and reducing surface water runoff with the Low Impact Development approach with green infrastructure (GI) implementation in the urban catchment area. This research takes a case study in Tanjung Barat Sub-district, South Jakarta, which acts as one of the water catchment area of Jakarta. The aims of this study are to determine the placement of GI in accordance with the criteria of land suitability and analyze the effectiveness of its application. The method used in this research is the modeling of GI placement by using BMP Siting Tools module on the SUSTAIN program and ArcGIS. And its effectiveness analysis with the calculation of flow coefficient and flow of runoff. The study result showed some of GI types that suitable to be implemented are bioretention and rain barrel. Based on the calculation of flow coefficient and runoff flow, it is known that GI application is effective in lowering the flow coefficient and reducing runoff discharge by 26.25%.