Resmani, Eva (2017) Analisa Kapasitas Tampung Saluran Drainase Akibat Pengaruh Limpasan Permukaan Kecamatan Kota Sumenep. Magister thesis, Universitas Brawijaya.
Abstract
Adanya perubahan alih fungsi lahan dari lahan hijau menjadi lahan pemukiman pada beberapa tahun terakhir ini menyebabkan terjadinya limpasan permukaan di beberapa lokasi di Kecamatan Kota Sumenep. Kondisi eksisting saluran membutuhkan perubahan dimensi yang mampu menyalurkan limpasan yang terjadi. Penelitian ini bertujuan untuk mengetahui kapasitas saluran drainase yang ada (eksisting) terhadap curah hujan dengan debit rencana kala ulang 5 tahun dan menentukan pengendalian banjir yang dapat dilakukan di Kecamatan Kota Sumenep. Pemodelan dilakukan dengan menggunakan instrumen SWMM dengan membandingkan kondisi jaringan drainase sebelum dan sesudah penerapan rehabilitasi saluran. Dari hasil perhitungan kalibrasi model diperoleh nilai RMSE sebesar 0,139. Nilai tersebut menunjukkan bahwa nilai parameter yang digunakan dalam pemodelan mendekati variasi nilai observasi. Dari hasil perhitungan diperoleh kapasitas outlet 1 = 3,53 m3/dt; outlet 2 = 2,75 m3/dt; outlet 3 = 2,52 m3/dt; outlet 4 = 1,21 m3/dt; outlet 5 = 4,65 m3/dt; outlet 6 = 6,20 m3/dt; outlet 7 = 1,47 m3/dt; outlet 8 = 0,60 m3/dt; outlet 9 = 4,49 m3/dt. Hanya jaringan drainase sekunder outlet 3 dan 7 yang mampu menampung limpasan curah hujan, sedangkan untuk jaringan drainase sekunder outlet 1, 2, 4, 5, 6 dan 8 tidak mampu menampung curah hujan dengan debit rencana kala ulang 5 tahun. Untuk mengurangi genangan akibat limpasan permukaan yang terjadi, dibutuhkan rencana rehabilitasi saluran drainase sekunder pada masing-masing outlet dan alternatif pengalihan debit limpasan. Berdasarkan perbandingan antara tinggi muka air Sungai Marengan dan outlet saluran, pada outlet 4, 5, dan 6 terjadi pengaruh arus balik (backwater) dari Sungai Marengan. Dimensi saluran baru yang telah direncanakan tidak hanya mampu menampung limpasan air hujan dengan kala ulang 5 tahun, tapi juga mampu menampung limpasan debit akibat dari pengaruh arus balik dari Sungai Marengan.
English Abstract
A change in land use of green land into residential land in recent years has caused a runoff in several locations in the District of Sumenep city. Existing conditions require changes in dimensional channel which is capable of channeling the runoff that has occurred. This study aims to determine the capacity of the existing drainage channels towards the rainfall with 5-year flood discharge plan and determine the flood control that can be performed in the District of Sumenep city. Rainfall runoff modeling using SWMM instrument by comparing the drainage channel conditions before and after the implementation of channel rehabilitation. From the model calibration calculation, the RMSE value obtained is at 0,139. This value indicates that the value of the parameters used in the modeling approaches the observed values variation. From the calculation it is obtained that the first outlet capacity = 3,53 cms; 2nd outlet = 2,75 cms; 3rd outlet = 2,52 cms; 4th outlet = 1,21 cms; 5th outlet = 4,65 cms; 6th outlet = 6,20 cms; 7th outlet = 1,47 cms; 8th outlet = 0,60 cms; 9th outlet 9 = 4,49 cms. Only secondary drainage channels of outlets 3 and 7, which can accommodate the runoff of rainfall, while the secondary outlet for drainage channels of 1, 2, 4, 5, 6 and 8 are not capable to accommodate rainfall with the 5-year flood discharge plan. To reduce surface runoff inundation that has happened, it takes a secondary drainage canal rehabilitation plan at each outlet and alternative diversion of runoff discharge. Based on the comparison between the water level of Marengan river and drainage channels outlet, there are reverse flows effect (backwater) in the outlet 4, 5, and 6 from Marengan River. The dimensions of the new planned channel is not only capable to accommodate rainwater runoff with a 5-year return period, but is also capable to accommodate runoff discharge performance due to the reverse flow of Marengan River.
| Item Type: | Thesis (Magister) |
|---|---|
| Identification Number: | TES/627.54/RES/a/2017/041706414 |
| Uncontrolled Keywords: | DRAINAGE, DRAINAGE - EVALUATION, RUNOFF, INDONESIA - SUMENEP |
| Subjects: | 600 Technology (Applied sciences) > 627 Hydraulic engineering > 627.5 Reclamations, Irrigation, related topics > 627.52 Irrigation > 627.54 Drainage and reclamation from sea |
| Divisions: | S2/S3 > Magister Teknik Pengairan, Fakultas Teknik |
| Depositing User: | Nur Cholis |
| Date Deposited: | 07 Aug 2017 03:42 |
| Last Modified: | 11 Dec 2020 03:16 |
| URI: | http://repository.ub.ac.id/id/eprint/1070 |
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