Diversion Canal to Decrease Flooding (Case Study : Kebon Jati-Kalibata Segment, Ciliwung River Basin)

Abstract

Abstract. The flood in Jakarta has become a national concern in Indonesia. It is a haunting disaster, with a high probability to happen when heavy rainfalls in Jakarta and/or its upstream area. Based on data that was provided by Public Work Agency of DKI Jakarta, there are 78 vulnerable points of inundation in which, most of them are located in Ciliwung river basin, commonly in the meandering segments. One of the worst flooding occurs in Pancoran, at Kebonjati to Kalibata segment in particular. The river discharge in this segment is much higher as compared to the carrying capacity. In addition, this area has a high density of population and thus, difficult to increase the *river capacity* by enlarging the river dimension. In this research, a closed diversion canal is proposed as a solution. The effectiveness of the solution is evaluated using a numerical model, HEC-RAS 4.1. The diversion canal is designed as two culverts, with 2.0 m in diameter. Nevertheless, hydraulic jump may occur at the outlet of the canal due to the relatively steep slope. Therefore, the canal outlet should be designed accordingly. A Hydraulic structure such as a stilling basin can be employed to reduce the energy. The results show that the diversion canal has a good performance in decreasing water level and flood discharge in the study area. The canal has the capacity of 17,72 m3/sec and succesfully decreases the water level by 4.71 -5.66 m from flood level for 2 -100 years returned period.

Computing urban flooding of meandering river using 2D numerical model (case study : Kebon Jati-Kalibata segment, Ciliwung river basin)

“…For future work, in order to manage flood disaster that annually occured on its segment, it is important to develop diversion canal. Furthermore, since from previous work that 1D HEC-RAS model had faced problems related to velocity and hydraulics jump at the end of canal [1], it is also considerable for applying stilling basin at the outlet of canal.…”

“…Formerly, the hydraulics modelling used 1D HEC-RAS. But there are several lacks related to flood characteristics, specially velocities and discharges, when being compared with observation data [1].…”

“…Others studies implied, when comparing 1D and 2D Numerical model in complex condition, for some cases, 1D approach is commonly may not be sufficient [1,4]. On the other hand, a 2D model was successfully used to simulate a high-magnitude outburs flood in Kverkfjoll, Iceland [5] or using Shallow Water Equation [6].…”

Pemodelan Penerapan Terowongan Air (Tunnel) dalam Mengatasi Banjir Akibat Luapan Sungai Deli

“…Studi ini terdiri dari pemodelan hidrologi dan pemodelan hidraulika, dimana pemodelan hidrologi untuk mendapatkan model hidrograf banjir aliran Sungai Deli. Pemodelan hidraulika untuk menganalisis kapasitas sungai dan kanal yang menjadi alternatif banjir (Indrawati et. al, 2018).…”

The Use of GIS and Hydrodynamic Model for Performance Evaluation of Flood Control Structure

“…Rainfall characteristics with large spatial and temporal variability cause flood with high probabilistic and stochastic characteristic. In other words, flooding in the river can occur at any time with varying discharges [2][3][4].…”