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Abstrak :
Infrastruktur hijau merupakan teknologi untuk mengelola air hujan yang mampu mengendalikan limpasan. Penelitian ini bertujuan untuk menilai efektifitas dan efisiensi infrastruktur hijau dalam pengurangan volume dan debit puncak limpasan hujan pada tipikal daerah perkotaan. Lokasi penelitian ini adalah Kelurahan Baru, Kecamatan Pasar Rebo, Jakarta Timur yang berada di sub DAS Cijantung. Praktik infrastruktur hijau yang disimulasikan yaitu bioretensi, constructed wetlands dan vegetative swales. Pemodelan sebaran spasial penempatan infrastruktur hijau menggunakan GITBoLA menunjukkan potensi sebaran bioretensi sebesar 15,88%, constructed wetlands dan vegetative swales masing-masing seluas 4,42%. Hasil analisis SWMM menunjukkan bioretensi mampu mengendalikan debit puncak limpasan sebanyak 23,47% dengan kemampuan mengontrol volume limpasan 222 liter/m2 sedangkan constructed wetlands mereduksi debit puncak sebesar 5,91% dengan kemampuan mengontrol volume 197 liter/m2 dan vegetative swales mereduksi debit puncak sebesar 2,11% dengan mengontrol volume 70 liter/m2. Luas optimum dari kombinasi penggunaan bioretensi dan constructed wetlands sebesar 17,6%. Nilai present value dari biaya infrastruktur hijau sebesar Rp. 55,26 milyar, lebih rendah dibandingkan infrastruktur konvensional dengan saluran drainase dengan present value sebesar Rp. 57,39 milyar. Sehingga dari segi ekonomi, infrastruktur hijau efisien untuk diterapkan. ......Green infrastructure is a technology for managing stormwater to control runoff. This study aims to assess the effectiveness and efficiency of green infrastructure in reducing the volume and peak runoff in typical urban areas. The study area is Baru Village, East Jakarta, which is in the Cijantung sub-watershed. The simulated green infrastructure practices are bioretention, constructed wetlands and vegetative swales. The green infrastructure siting modeling using GITBoLA shows a potential bioretention distribution of 15.88%, constructed wetland and vegetative swales of 4.42% respectively. The results of the SWMM analysis show bioretention control peak discharge as much as 23.47% with the ability to control runoff volume 222 liters/m2 while constructed wetland reduces peak discharge by 5.91% with the ability to control 197 liter/m2 volume and vegetative swales reduce peak discharge by 2.11% and controlling the volume of 70 liters/m2. The optimum area of the combination use of bioretention and constructed wetlands is 17.6%. Present value of green infrastructure costs Rp. 55.26 billion, lower than conventional infrastructure with drainage channels with a present value of Rp. 57.39 billion. From an economic perspective, green infrastructure is efficient to implement.

Abstrak :
ABSTRAK
Urbanisasi telah mengubah tutupan lahan dari permukaan lolos air menjadi permukaan kedap air yang dapat berdampak pada peningkatan limpasan hujan di kawasan perkotaan. Penelitian ini bertujuan untuk menilai efektifitas sebaran spasial Green Infrastructure (GI) dalam pengurangan limpasan hujan di berbagai spektrum hujan. Simulasi pengurangan limpasan hujan melalui penerapan GI diimplementasikan pada DTA yang berlokasi di Pondok Kelapa, Duren Sawit, Jakarta Timur. EPA SWMM digunakan untuk mensimulasi model hidrologi melalui tiga skenario : skenario-1 baseline (kondisi eksisting tanpa penerapan GI), skenario-2 GI (penerapan GI melalui rain garden, rain barrel dan porous pavement), skenario-3 RDTR (sesuai Rencana Detail Tata Ruang DKI Jakarta). Hasil simulasi SWMM menunjukkan skenario-2 GI untuk hujan kala ulang 2-, 5-, 10-, 25-, 50-tahun menghasilkan persentase pengurangan total volume limpasan secara berurutan sebesar 9.76%, 8.76%, 8.27%, 7.50%, 7.05% dan persentase pengurangan debit puncak sebesar 9.29%, 7.97%, 5.83%, 3.49%, 2.21% dibandingkan tanpa penerapan GI. Adapun untuk skenario-3 RDTR untuk kala ulang hujan yang sama menghasilkan persentase penambahan total volume limpasan secara berurutan sebesar 7.43%, 6.15%, 5.36%, 4.67%, 4.20% dan persentase penambahan debit puncak sebesar 3.93%, 2.33%, 1.29%, 0.63%, 0.63% dibandingkan dengan kondisi eksisting tanpa penerapan GI.

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ABSTRACT
Urbanization has changed the land use from pervious cover to impervious cover which have an impact on increasing runoff in urban areas. The objective of this study is to determine the effectiveness of spatial distribution of Green Infrastructure (GI) in reducing runoff under various design storms. Simulation of runoff reduction is carried out by implementing the GI in the catchment area located in Pondok Kelapa, Eastern Jakarta, Indonesia. EPA SWMM 5.1 was used to simulate the performance of GI on reducing runoff in the study site for three simulation scenarios: baseline scenario (current conditions), GI scenario (implementing rain garden and rain barrel) and Rencana Detail Tata Ruang (RDTR) scenario. The results show that GI scenario compared to the baseline scenario under various design storms 2-year, 5-year, 10-year, 25-year and 50-year return periods reduce the total runoff volume approximately 9.76%, 8.76%, 8.27%, 7.50%, 7.05, respectively and reduce the peak flows approximately 9.29%, 7.97%, 5.83%, 3.49%, 2.21%. For RDTR scenario compared to BL scenario resulting in percentile of total runoff volumes increase were 7.43%, 6.15%, 5.36%, 4.67%, 4.20% and the percentile of peak flows increase were 3.93%, 2.33%, 1.29%, 0.63%, 0.63% for the same return periods.

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