Analisis Banjir pada Polder Sunter Timur II dengan Menggunakan HEC-RAS (Ras Mapper)

Agis Setiyowati; Evi Anggraheni

doi:10.29103/tj.v14i1.1003

Analisis Banjir pada Polder Sunter Timur II dengan Menggunakan HEC-RAS (Ras Mapper)

Agis Setiyowati, Evi Anggraheni

Abstract

Abstrak

Banjir di Jakarta menimbulkan kerusakan dan kerugian, menjadi latar belakang dilakukannya analisis banjir di Polder Sunter Timur II yang disajikan dalam makalah ini. Wilayah hilir Jakarta terbagi menjadi 43 sistem polder dan salah satunya adalah Polder Sunter Timur II. Studi ini bertujuan untuk mendapatkan luas daerah banjir rencana Polder Sunter Timur II. Analisis hidrologi menggunakan software HEC-HMS dan analisis banjir menggunakan HEC-RAS (Ras Mapper). Data input yang digunakan dalam pemodelan yaitu Digital Elevation Model (DEM), hidrograf, peta penggunaan lahan. Daerah tangkapan air polder Sunter Timur II sebesar 1,328 km². Hasil simulasi HEC-HMS didapat debit banjir rencana kala ulang 5, 10 dan 25 tahun yaitu sebesar 185 m³/dt, 208,7 m³/dt, 234,3 m³/dt. Hasil simulasi HEC-RAS menunjukkan luas daerah banjir dengan debit banjir kala ulang 5, 10 dan 25 tahun adalah 857,08 Ha, 885,62 Ha, 979,59 Ha.

Kata kunci: banjir, sistem polder, analisis hidrologi, HEC-HMS, HEC-RAS

Abstract

Flood in Jakarta cause damage and losses are the reason for flood analysis of the East Sunter II Polder presented in this paper. Downstream area of Jakarta is divided into 43 polder systems and one of them is East Sunter II Polder. This study aims to obtain the flood area of Polder East Sunter II plan. Hydrological analysis using HEC-HMS software and flood analysis using HEC-RAS (Ras Mapper). Input data used in modeling are Digital Elevation Model (DEM), hydrograph, land use map. Catchment area of the East Sunter II polder is 1,328 km². The result of HEC-HMS, for 5-, 10- and 25-year return period flood discharge is 185 m³/s, 208,7 m³/s, 234 m³/s. The results of HEC-RAS show that the flood area with 5, 10 and 25-year return period flood discharge is 857,08 Ha, 885,62 Ha, 979,59 Ha.

Keywords: flood, polder system, hydrology analysis, HEC-HMS, HEC-RAS

Keywords

banjir, sistem polder, analisis hidrologi, HEC-HMS, HEC-RAS

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DOI: http://dx.doi.org/10.29103/tj.v14i1.1003