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An analysis of the Pluit polder, Jakarta

Sleen, Niek van der (2013) An analysis of the Pluit polder, Jakarta.

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Abstract:Since 1997, the capital city of Indonesia, Jakarta, was hit by five major floods. In January of 2013 the Pluit polder, with 215.000 residents, in the north of Jakarta was hit by a severe flood. One of the causes of the flooding was the failure at the Pluit pumping station. A few hours after the flooding all the three pumping houses at the Pluit pumping station were broke down. The waduk (lake) in front of the pumping station was not able to store the total amount of water that was flowing towards waduk Pluit. As a result, a great part of the Pluit polder was inundated. This event raised the question if the storage capacity of the Pluit polder is sufficient. The research is done about what measures are required to let the Pluit polder meet the current applicable design criteria regarding the storage- and pumping capacity. By studying several documents original design criteria and current design criteria are examined. Amongst these documents was the “Flood control manual” by W-E-R Agra Limited in 1993 and the “Masterplan for drainage and flood control for Jakarta” by NEDECO in 1973. The first document is made to create a more consistent approach in the Public Works departments in Indonesia. The second document is the original design plan for the Pluit polder and includes information about the design criteria used when the polder was initially designed. Thereafter the current situation in the Pluit polder is analyzed. This is done by field trips towards some of the pumping stations, gates and drains in Pluit. These fieldtrips created a global understanding of the drainage system. The technical details about the capacities and standard operation procedures of the pumping stations were found in documents of Dinas Pekerjaan Umum. From the Flood Hazard Mapping (FHM) model by Deltares mostly geographical information about gates and pumping stations is taken. The technical information from DPU was compared to the FHM and some corrections in the FHM were made. With all the gathered information and the FHM model, the discharges towards the pumping stations are calculated. With the discharges and the pumping capacities of the pumping stations known, the amount of water that has to be stored is calculated. From these results it becomes clear if the current design still meets the applicable design criteria. The drainage system in the Pluit polder is originally designed with return periods of 2 years for the minor drainage system and 25 years for the major drainage system. In Pluit, the minor drainage system consists of all the drains except for some designated rivers (the kali Cideng, kali Besar and AK Ciliwung Kota). Dinas Pekerjaan Umum (DPU) still uses the same return periods for the major drainage system. For the minor drainage system they use a 10- or 25-year return period, depending on the local situation (obstacles can be illegal housing, high land prices etc.). In the Pluit polder are three major pumping stations (pompa Pluit (now 34 m3/s, in the future 49 m3/s), pompa Cideng (40.2 m3/s) and pompa Melati (13.6 m3/s). In the future the pumps of Pasar Ikan (30 m3/s) and Duri (6 m3) will be build. The system exists of several sub drainage systems which are connected by gates. These gates will be opened towards Pluit when the water level in another sub drainage system will become too high. The pumping stations and the storage capacities in the Pluit polder are enough to handle a 25-year rainfall return event and therefore meet the design criteria. In the current situation there is 8.35 m3/s of unused pumping and storage capacity (calculated to a 24-hour pumping capacity). In the future situation this will be 30.2 m3/s. This means in the future situation a total pumping capacity of 30.2 m3/s can break down and Pluit will still meet the design criteria. Since the storage and pumping capacities in the Pluit polder are enough to handle a 25-year return period with still some backup capacities left, it is recommended to DPU that the future focus should be on the maintenance of the pumping stations and waduks instead of building new pumping stations and waduks. As long as the current system is functioning as it should be, the Pluit polder meet the 25-year return period. If the parts of the system are not fully functioning, it is not guaranteed that the system will meet the design criteria.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering BSc (56952)
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