Edijatno Edijatno
Jurusan Teknik Sipil FTSP - ITS

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Perencanaan Embung Gunung Rancak 2, Kecamatan Robatal, Kabupaten Sampang

Jurnal Teknik ITS Vol 1, No 1 (2012): Jurnal Teknik ITS (ISSN 2301-9271)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

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Abstract

Embung Gunung Rancak 2 terletak di Sungai Umbaran Desa Gunung Rancak Kecamatan Robatal Kabupaten Sampang. Pembangunan Embung Gunung Rancak 2 dengan daerah aliran sungai (DAS) seluas 0,3871 km2 ini diharapkan mampu menyediakan air baku untuk penduduk Desa Gunung Rancak. Dalam suatu perencanaan embung diperlukan pertimbangan dan perhitungan – perhitungan sehingga didapatkan suatu hasil yang efisien dan paling ekonomis. Pertimbangan-pertimbangan yang perlu diperhatikan adalah kebutuhan air baku yang sesuai dengan proyeksi pertumbuhan masyarakat, volume curah hujan yang dapat memenuhi embung, dan kondisi topografi pada lokasi. Sehingga pada akhirnya akan diperoleh bangunan embung yang efisien untuk dapat memenuhi kebutuhan masyarakat sesuai kondisi di lapangan. Hasil perencanaan pada tugas akhir ini adalah debit banjir rencana yang digunakan dengan periode ulang 100 tahun adalah sebesar 9,55 m3/dt dan tinggi muka air di atas pelimpah saat kondisi banjir adalah 0,681 m. Elevasi puncak spillway yang digunakan +106,18 m. Spillway direncanakan dengan tipe Ogee lengkap dengan bangunan pelengkapnya. Bangunan spillway beserta bangunan pelengkapnya sudah dianalisa stabilitasnya meliputi : kontrol guling, kontrol geser, kontrol daya dukung tanah, dan kontrol daya dukung bangunan peredam energi. Dengan hasil  bangunan yang direncanakan masih tergolong aman.

A Comparative Study of Water Quality Characteristics at East Java River

IPTEK The Journal for Technology and Science Vol 21, No 4 (2010)
Publisher : Institut Teknologi Sepuluh Nopember

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Abstract

Water is the natural resources have the function of very importance for human life and also as authorized capital in development. Water will influence by the other component. Exploiting of water to support all human life must done with wise action to management so that not result damage at water resource. As place relocation of water hence river have the selected capacities that able to change because natural activity and antropogenik. This research was conducted in nine major rivers in East Java. The objectives of this study were: 1) Identifying the characteristics and concestration range of water quality parameter, 2) Comparison the level of pollution in rivers in East Java. The results of this study indicated that the characteristic of water quality parameter of rivers in East Java were generally physical, chemical and biological. The comparison result of water quality parameter basically showed that in general the pH was still under threshold that had been determined, that was pH from 6 to 9. In general, DO concentration ranged from 0.5 mg/l to 7 mg/l, BOD concentration ranged from 3 mg/l to 11 mg/l and the COD concentration ranged between 0.5 mg/liter to 35 mg/l.

Evaluating Error of Temporal Disaggregation from Daily into Hourly Rainfall using Heytos Model at Sampean Catchments Area

IPTEK The Journal for Technology and Science Vol 21, No 1 (2010)
Publisher : Institut Teknologi Sepuluh Nopember

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Abstract

Developing a rainfall-runoff model sufficient to flood prediction hourly rainfall data. Lack of automatic rain gauge for high resolution rainfall in catchment area can be an obstacle for the modeling. Otherwise, the manual rain gauges may spread on all of catchments areas, providing daily rainfall. Daily rainfall disaggregation to hourly rainfall is an innovation to get higher temporal resolution of the rainfall. This paper attempts to evaluate the implementation of rainfall disaggregation model in Sampean Catchments Area using Heytos. The proposed parameter optimation use Moment Performance model that tested by calibrating it with available hourly data. The results of model indicated that only data within five months had good performance. The estimation result showed that relative error total of January, February, August, November, and December was less than one. In case of March, April, May, June, July, September, and October the model could not result respectively to generate model.

Generating Hourly Rainfall Model using Bayesian Time Series Model (A Case Study at Sentral Station, Bondowoso)

IPTEK The Journal for Technology and Science Vol 22, No 1 (2011)
Publisher : Institut Teknologi Sepuluh Nopember

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Abstract

Disaggregation of hourly rainfall data is very important to fulfil the input of continual rainfall-runoff model, when the availability of automatic rainfall records are limited. Continual rainfall-runoff modeling requires rainfall data in form of series of hourly. Such specification can be obtained by temporal disaggregation in single site. The paper attempts to generate single-site rainfall model based upon time series (AR1) model by adjusting and establishing dummy procedure. Estimated with Bayesian Markov Chain Monte Carlo (MCMC) the objective variable is hourly rainfall depth. Performance of model has been evaluated by comparison of history data and model prediction. The result shows that the model has a good performance for dry interval periods. The performance of the model good represented by smaller number of MAE by 0.21 respectively.

Strategi Pemeliharaan Jaringan Irigasi Daerah Irigasi Blimbing

Jurnal Aplikasi Teknik Sipil Vol 16, No 1 (2018)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

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Abstract

Daerah Irigasi (DI) Blimbing mengairi lahan pertanian sebesar 319 Ha. Kondisi fisikjaringan irigasi banyak mengalami kerusakan yang mengakibatkan menurunnya fungsijaringan irigasi. Sehingga diperlukan pemeliharaan untuk mengembalikan fungsi jaringanirigasi ke kondisi semula. Tujuan dari penelitian ini adalah untuk memperoleh strategipemeliharaan jaringan irigasi DI Blimbing yang optimal, dengan memperhatikan biaya.Tahap awal adalah mengidentifikasi, menilai kondisi fisik dan fungsi bangunan irigasi danmembuat urutan prioritas pemeliharaan jaringan irigasi. Kemudian menghitung Benefitand Cost untuk menilai kelayakan. Penelitian ini menggunakan Metode Linier Programmingyang terdiri dari fungsi tujuan dan kendala. Sebagai fungsi tujuan adalahmemaksimumkan nilai prioritas/nilai manfaat, sedangkan untuk fungsi kendala yaituketerbatasan biaya. Mengacu biaya sebesar Rp. 100.000.000, permodelan/optimasipemeliharaan yang dikaitkan untuk memaksimalkan nilai prioritas atau nilai manfaatdiperoleh ruas yang dapat diperbaiki sebanyak 7 ruas dengan anggaran sebesar Rp.99.998.877. Hasil optimasi dengan memaksimalkan nilai prioritas sama dengan hasiloptimasi dengan memaksimalkan nilai manfaat.