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Abstrak :
ABSTRAK
Ada sekitar 40% dataran di Jakarta yang tidak dapat mengalirkan air secara gravitasi menurut studi dari Jakarta Coastal Defense Strategy. Hal ini mengakibatkan beberapa daerah di Jakarta terjadi genangan banjir. Untuk mengatasi hal tersebut dibuatlah suatu sistem drainase untuk kawasan yang tidak dapat mengalirkan air secara gravitasi, yaitu sistem polder. Ide awal dari sistem polder di Jakarta sebenarnya sudah tercetus sejak zaman penjajahan Belanda, tetapi ide tersebut baru terealisasikan dalam sebuah kajian yang dilakukan oleh NEDECO tahun 1973 berupa masterplan dari sistem drainase di Jakarta. Pada masterplan tersebut diketahui bahwa Jakarta dibuat menjadi suatu sistem polder dengan Banjir Kanal Barat dan Banjir Kanal Timur sebagai pembatasnya. Beberapa kawasan di Jakarta juga dibuat menjadi sistem polder. Salah satunya adalah Sistem Polder Waduk Sunter Utara. Pada kenyataannya walaupun kawasan Sunter Utara sudah dalam bentuk sistem polder, masih terdapat genangan banjir di kawasan tersebut. Untuk mengetahu penyebab genangan banjir di kawasan tersebut dilakukan dengan simulasi menggunakan aplikasi HEC-HMS dan HEC-RAS. Berdasarkan hasil simulasi tersebut diketahui bahwa penyebab genangan banjir di Sistem Polder Waduk Sunter Utara akibat dari kurangnya kapasitas saluran utama dan operasi pompa di sistem polder yang kurang optimum. Sehingga untuk mengatasi genangan banjir tersebut dapat dilakukan dengan memperbesar dimensi saluran utama dan menambah kapasitas serta mengubah elevasi operasi pompa.

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ABSTRACT
There are around 40% of the plains in Jakarta that cannot drain water by gravity according to a study from the Jakarta Coastal Defense Strategy. This resulted in several flood areas in Jakarta. To overcome this problem, a drainage system is created for areas that cannot drain water by gravity, which was named polder system. The initial idea of ​​a polder system in Jakarta had actually emerged since the Dutch colonial era, but the idea was actualized in a study conducted by NEDECO in 1973 in the form of a master plan of a drainage system in Jakarta. In the master plan, it is known that Jakarta is made into a polder system with the West Flood Canal and the East Flood Canal as a barrier. Some areas in Jakarta are also made into polder systems. One of them is the North Sunter Polder System. In fact, even though the North Sunter area is already in the form of a polder system, there is still flood in this area. To find out the cause of flood inundation in the area, it can be known by simulation using the HEC-HMS and HEC-RAS applications. Based on the simulation results it is known that the cause of flood inundation in the North Sunter Polder System is due to the lack of main channel capacity and less optimum pump operation in the polder system. So that to overcome the flood inundation can be done by enlarging the dimensions of the main channel and increasing capacity and changing the pump operating elevation.

Abstrak :
Nowadays, most of the large cities in Indonesia are growing along the coastal area with flat topography which tend to be under the mean sea level. The Water Management & Drainage System of Sector UB-2 Pantai Indah Kapuk North Jakarta was designed for the ponder system to eliminate the area from flood. The ponder system is a closed area protected by a ring dyke where the drainage system, pond or long storage and pumping system is used to manage the water level, velocity and discharge. This system has to be managed as one inseparable unit of water management, so that the surface as well as groundwater level in the ponder can be maintained using 25 year recurrence interval of design rainfall. The main function of the pumps is to maintain the water level in the reservoir as well as in the primary canal. The only outlet of the reservoir is through this pump. To ensure that the ponder system shall have a good pumping performance, it is necessary to design the Standard Operation Procedure for the pumps. The Standard Operation Procedure has been designed based on the Hydraulic Simulation Model of the polder system, using XP-SWMM software, passing some stages: Numerical Model setting up, initial estimation of pumping discharge, sensitivity test of pumping performance, Standard Operation Pumping Procedure Decision by taking into account the difficulty and failure possibility in implementation, such as genset (generator set) canonization, travel time of water to the pump station, design criteria of the polder, storage water level increase rate, total on-off event of the pump, and pumping duration.

Abstrak :
ABSTRAK
Sistem pengendalian banjir Provinsi DKI Jakarta memiliki dua buah prinsip kerja, salah satunya air akan dialirkan secara gravitasi menuju polder di daerah utara Jakarta. Salah satu sistem polder pengendalian banjir di Jakarta adalah sistem tata air Polder Pluit dengan daerah layanan seluas 2400 Ha. Pada saat ini desain pola operasi Polder Pluit telah berbeda dengan desain NEDECO untuk menyesuaikan kondisi yang ada. Tidak berfungsinya bangunan siphon membuat Pemerintah Provinsi Pemprov DKI Jakarta mengganti inlet Waduk Pluit menjadi saluran terbuka. Perubahan ini membuat komponen sistem saluran drainase dan Waduk Pluit menjadi satu kesatuan yang menyebabkan kinerja pompa semakin berat karena perlu mengosongkan keduanya. Sehingga penulis pada penelitian ini melakukan simulasi yang dibantu dengan software HEC-RAS untuk melihat dampak perbuhan tersebut pada kinerja sistem tata air Polder Pluit. Skenario pertama adalah kondisi eksisting tanpa adanya bangunan air. Skenario kedua inlet merupakan bendung selebar 50 m jenis ogee. Skenario ketiga inlet merupakan bangunan siphon berdasarkan desain NEDECO. Dari hasil perhitungan dapat disimpulkan hanya skenario satu dan ketiga yang dapat mengakomodir debit banjir, dan bila dilihat dari kinerja pompa skenario ketiga mengalami penghematan 52,25 jam dibanding pompa pertama. Pada kesimpulannya perlu dibangun kembali siphon agar sistem tata air berjalan efektif.

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ABSTRACT
Flood prevention system in DKI Jakarta has two work principles. The first one is water will be streamed by gravity to polders that located in North Jakarta. One of the polder system in Jakarta is Pluit Polder, that has 2.400 Ha for its service area. Now, operation pattern design of Pluit Polder is different with NEDECO rsquo s design. Siphon that unfunctionnally well makes DKI Jakarta rsquo s governance change inlet to an opened channel. This change cause drainage system and Waduk Pluit become one component. This condition makes pump have to emptying waduk and drainage. So, writer in this study will make some simulations which helped by HEC RAS software to analyze a whole Pluit Polder system performance in 3 type inlet. The first scenario is the existing condition. The scond scenario is 50 m width dam with ogee spillway. The third scenario is siphon based on NEDECO rsquo s first design. The result is, only the first and third scenario model can accomodate the existing flood discharge prevention, and based on pump operation performance the third scenario model is more effective because this operation is more thrifty 52,25 hours than the first senario. For the result writer suggest to build siphon to improve efficiency system.