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.
Highlights
Based on data from Indonesian National Board for Disaster Management (BNPB), since 1815, flood become the most frequently disaster with 31.5% of events compare to others such as puting beliung, terorism, fire and earthquake
Several studies related to this flood had conducted i.e Formanek [1] studied about Regional Flood Map Index for Ciliwung river flood based on FESWMS modelling, Emam [2] using HEC-HMS modelling in order to analyse land-use changes and assesment of climate in upper Ciliwung river basin, and Murniningsing [3] shows that the developing of Ciawi, Sukamahi and Katulampa weir DAM takes less significant values compared to its huge cost
This study will analyze the effectiveness of diversion canal in order to decrease the flooding specially in Kebonjati- Kalibata segment which indicated as the source of problem in Pancoran area
Summary
Based on data from Indonesian National Board for Disaster Management (BNPB), since 1815, flood become the most frequently disaster with 31.5% of events compare to others such as puting beliung, terorism, fire and earthquake. For DKI Jakarta, during period 2011-2015, there are 98 flood events occur and most of them were happened on Ciliwung river basin and make these a national concern in Indonesia. It is a haunting disaster with a high probability hazard in every heavy rainfall occurs in DKI Jakarta area and/or its upstream of river basin. This study will analyze the effectiveness of diversion canal in order to decrease the flooding specially in Kebonjati- Kalibata segment which indicated as the source of problem in Pancoran area. In some of researches show lackness of this method because of its impacts regard to sedimentation [4] and [5], the river diversion recomended for river on flattened area [6] with dense population
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