![]() The effects at the downstream reach of Ciliwung and Cipinang River due to the diversion are also obtained. The results show that capacity of the system can be achieved for certain condition at upstream and downstream boundary. Simulations were done for steady condition. A 1-D numerical hydraulic model using HEC-RAS based on a proposed design is used to assess the performance of the diversion system in any combination of upstream and downstream boundary condition. This diversion is based on the available capacity of KBT. Cipinang River has its downstream end at Eastern Flood Canal (Kanal Banjir Timur, KBT). So before creating river attributes in GIS, let us first create empty GIS layers using the RAS Geometry menu on the HEC-GeoRAS toolbar. In HEC-GeoRAS, each attribute is stored in a separate feature class called as RAS Layer. This paper presents capacity analysis of a proposed flood diversion of Ciliwung River to Cipinang River. using HEC-GeoRAS involves creating these attributes in GIS, and then exporting them to the HEC-RAS geometry file. ![]() There are alternatives to reduce flood risk, such as: river capacity improvement, existing natural reservoir and polder system improvement, upstream reservoir construction, city drainage improvement, flood channel construction and flood diversion. One major river which flow through Jakarta is Ciliwung River. ![]() * Corresponding author: a coastal city which lies in lowland area, Jakarta is prone to flooding. Institut Teknologi Bandung, Faculty of Civil and Environmental Engineering, Ganesha 10, Bandung, Indonesia Joko Nugroho *, Indratmo Soekarno and Dhemi Harlan ![]()
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