Evaluasi Sistem Saluran Drainase di Perumahan Pondok Safari Indah, Tangerang Selatan

Abstract

Perumahan Pondok Safari Indah mengalami banjir beberapa tahun belakangan ini apabila curah hujan tinggi dan durasi hujan lama. Penelitian difokuskan pada lokasi banjir di Blok C dan Blok D Perumahan Pondok Safari Indah. Penelitian bertujuan untuk mengevaluasi kesesuaian saluran drainase dengan debit limpasan yang terjadi. Luas lokasi penelitian sebesar ±3,4 Ha. Data yang digunakan berupa dimensi saluran, elevasi saluran, data curah hujan harian maksimum, peta topografi dan peta tutupan lahan. Data yang diperoleh digunakan untuk pemodelan saluran drainase dengan menggunakan program EPA SWMM 5.2. Setelah dilakukan pengujian pada 4 metode distribusi, maka curah hujan rencana dianalisis dengan distribusi log Pearson III, dan diperoleh curah hujan rencana sebesar 102,58 mm untuk periode ulang 2 tahun. Jaringan saluran drainase yang ada terdiri atas 34 subcatchment (SC), 72 junction node (JN), 71 counduit (CN), dan 1 outfall node (OR). Debit aliran maksimum sebesar 0,157 m3/detik. Dari hasil simulasi kapasitas saluran drainase sesuai dengan debit limpasan tetapi ada 2 saluran yang tidak mampu menampung limpasan. Pada CN 10 dan 11 terjadi luapan karena terdapat sedimen masing-masing setinggi 0,18 m dan 0,15 m. Kapasitas saluran CN 10 sebesar 0,115 m3/detik sedangkan debit simulasi sebesar 0,117 m3/detik. Saluran drainase mampu menampung dan mengalirkan air dengan baik bila dilakukan pembersihan dan pengerukan sedimen pada saluran drainase secara berkala.

Pondok Safari Indah Residence has experienced flooding in recent years while the rainfall was heavy and long. The research focused on flood locations in Block C and Block D of Pondok Safari Indah Residence. The study aimed to evaluate the suitability of drainage channels with runoff discharge. The surface of research area was ± 3,4 Ha. This research used data of channel dimension channel elevation, maximum daily rainfall, topographic maps and land cover maps. These data were used for modeling drainage channels using the EPA SWMM 5.2 program. After testing 4 distribution methods, the planned rainfall was analyzed with the log Pearson III distribution, and a planned rainfall of 102,58 mm was obtained for the 2-year rainfall return period. The existing drainage channels system consist of 34 subcatchment (SC), 72 junction nodes (JN), 71 counduit (CN), and 1 outfall node (OR). The maximum flow discharge is 0,157 m3/sec. From the simulation results, the capacity of the drainage channel is in accordance with the runoff discharge, but there are 2 channels that are not able to accommodate runoff. CN 10 and 11 overflowed because there was sediment as high as 0,18 m and 0,15 m respectively. The CN 10 channel capacity was 0,115 m3/sec while the simulated discharge was 0,117 m3/sec. The drainage channel were able to accommodate and drain water properly, if the drainage channels were cleaned and the sediments were dredged periodically.