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Gunarto, Danang
Universitas Tanjungpura
Civil Engineering, Building, Construction & Architecture Computer Science & IT Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Public Health Transportation

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FLOOD MODEL SIMULATION OF PURNAMA STREET AREA DUE TO INCREASE OF WATER LEVELS OF THE KAPUAS RIVER AND THE INTENSITY AND DURATION OF RAIN Fakhrully, Ya' Dhally; Umar, Umar; Gunarto, Danang; Herawati, Henny; Yulianto, Eko
Jurnal Teknik Sipil Vol 22, No 2 (2022): JURNAL TEKNIK SIPIL EDISI DESEMBER 2022
Publisher : Fakultas Teknik Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jtst.v22i2.59398

Abstract

Flooding is a condition where water is not accommodated or the flow of water is obstructed in the sewer, so that it overflows to inundate the surrounding area. The area around the ditch on Purnama Street (the estuary of the Kapuas River) is affected by tides and the intensity and duration of rainfall. This study aims to simulate the flood model that occurred in the Purnama Street area. Data analysis was carried out using HEC-RAS software as a tool for modeling drainage flow. The research was conducted during no rain conditions, 5 and 10 year return periods of rain and the highest and lowest tidal conditions. The flood model simulations were carried out from Demang Ditch to the Lower Kapuas River. The results of the modeling using HEC-RAS show that the drainage channel from the Kapuas River to Purnama Street does not experience inundation/flooding, but in the area of Purnama Street to Demang Ditch during the 5 and 10 year return period rains and the highest tides experience inundation/flooding. which reaches the highway.
Evaluation of the Drainage Channel Capacity of Air Ukah in Ngabang Barage, Lourdes Meirista; Gunarto, Danang; Soeryamassoeka, S. B.
Jurnal Teknik Sipil Vol 24, No 3 (2024): Vol 24, No 3 (2024): JURNAL TEKNIK SIPIL EDISI AGUSTUS 2024
Publisher : Fakultas Teknik Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jts.v24i3.82324

Abstract

Flooding in Ngabang, Landak Regency, Kalimantan Barat often results from high rainfall, urban expansion, and limited drainage. This study analyzes the Air Ukah drainage system, including primary, secondary, and tertiary channels, to assess current capacities against projected rainfall intensities. Hydraulic and hydrological analyses were performed using primary field data and validated rainfall records from 1999-2020. Findings reveal that the existing drainage, with the primary channel"™s 5.20 m ³/s capacity, the secondary channel at 0.36 m ³/s, and tertiary channels at 0.82 m ³/s, cannot accommodate maximum discharge, particularly for a 100-year return period rainfall of 114.27 mm/hour. To address this, channels were expanded: the primary channel was widened to 6.5 m and deepened to 3.5 m, increasing its capacity to 11.83 m ³/s. The secondary and tertiary channels were similarly upgraded, now accommodating 2.40 m ³/s and a cumulative 34.07 m ³/s. These modifications significantly enhance drainage capacity, preparing Ngabang to handle intense rain events and mitigating flood risks, particularly in urban areas. This upgraded system now meets the need for resilience against extreme rainfall, ensuring improved water management and community safety.  
STUDY OF TIDAL INFLUENCE ON FLOODING IN KECAMATAN SELAKAU Nurhadi, Nurhadi; Gunarto, Danang; Umar, Umar
Jurnal Teknik Sipil Vol 23, No 1 (2023): JURNAL TEKNIK SIPIL EDISI FEBRUARI 2023
Publisher : Fakultas Teknik Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jtst.v23i1.60571

Abstract

Kecamatan Selakau has a considerable risk of flooding, which occurs every year. Because it has a low topography, its location on the coast is undoubtedly greatly influenced by tides and is prone to tidal flooding. In an effort to anticipate and reduce the duration and frequency of rain by arranging the drainage system through technical study activities on drainage channels, especially on the Nyirih River drainage channel, which empties directly into the Selakau River.This research aims to examine the effect of the Selakau River's tides on the Nyirih River's drainage flow and the combination of tides and rainfall on the incidence of flooding in the Nyirih River channel. The research methodology used is the descriptive method. Hydrological analysis using the maximum daily rainfall data from Tebas Station. Then the Nyirih River water level tidal readings and the design discharge data are used in the hydrodynamic model analysis.Based on the analysis results using the HEC-RAS Version 6.1.0 software, the water level elevation from sta is at the highest tide conditions without rain. 0+000 to sta. 1 + 466,682 has exceeded the elevation of the existing channel cross-section so that it experiences inundation with a height of 0.02 m"“0.4 m, and at sta. 1 + 694,439 to sta. 2 + 073.878, the water level is still below the existing cross-sectional elevation of the channel, so no inundation occurs. It shows that there is no effect or increase in water level elevation that occurs for the highest tide combination conditions with rainfall return periods of 2, 5, 10, and 20 years, and it is the same as the highest tide conditions without rain, which experience inundation with a height of 0.02 m-0.4 m. Normalization is inefficient and unsuccessful in decreasing floods since sea tides extensively impact the Nyirih along the river channel.
PENGATURAN PINTU AIR (UNDERFLOW) UNTUK PENGATURAN MUKA AIR DI LAHAN PERTANIAN DAERAH IRIGASI RAWA (D.I.R) SEMELAGI KOMPLEK Kurniawan, Ade; Umar, -; Gunarto, Danang
JeLAST : Jurnal Teknik Kelautan , PWK , Sipil, dan Tambang Vol 9, No 1 (2022): JeLAST EDIS FEBRUARI 2022
Publisher : JeLAST : Jurnal Teknik Kelautan , PWK , Sipil, dan Tambang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jelast.v9i1.58135

Abstract

Daerah rawa di Kalimantan Barat khususnya di Kabupaten Sambas yang dipengaruhi oleh pasang surut air laut telah cukup lama direklamasi/diusahakan oleh sebagian penduduk setempat untuk lahan pertanian. Permasalahan yang terjadi adalah kebutuhan air yang semakin meningkat,   untuk itu dilakukan pengoperasian pintu air Semelagi Komplek yang saat ini mengalami masalah dalam hal volume air yang tidak merata. Penelitian ini bertujuan mencari besar kebutuhan air yang dibutuhkan dan dilakukannya Pengaturan pintu air pada Daerah Irigasi Rawa (D.I.R) Semelagi Komplek pada blok tanaman padi-padi, penelitian dilakukan dengan   mengolah   data curah hujan dan iklim untuk menentukan berapa besar kebutuhan air irigasi   dan lakukan perhitungan pengaturan pintu air. Dari hasil   pengolahan data   didapatkan hasil   Kebutuhan Drainase di daerah irigasi rawa (DIR) Semelagi Komplek didapat modulus drainase Q2 sebesar 7,30 l/s/ha, Q5 sebesar 10,18 l/s/ha, Q10 sebesar 11,69 l/s/ha, Q20 sebesar 12,92 l/s/ha, Q50 sebesar 14,33 l/s/ha, dan Q100 sebesar 15,29 l/s/ha. Dan pengaturan pintu air pada Daerah Irigasi Rawa (D.I.R) Semelagi Komplek, sebagai contoh pada pengoperasian pintu air 1 dapat untuk muka air dibagian hulu setinggi 1,60 m dilakukan bukaan pintu setinggi 0,03 m, sedangkan untuk muka air di bagian hulu setinggi 0,20 m dilakukan bukaan pintu setinggi 0,25 m yang berarti pada saat muka air di hulu tinggi maka di lakukan bukaan pintu air yang rendah agar air dari hulu tidak banyak terbuang sehingga dapat mencukupi kebutuhan air pada lahan pertanian dan perkebunan.Kata Kunci:, Daerah irigasi rawa ,Kebutuhan air irigasi, Pintu air.
EVALUASI SISTEM JARINGAN DISTRIBUSI AIR BERSIH (STUDI KASUS DI KECAMATAN SEKADAU HILIR KABUPATEN SEKADAU PROVINSI KALIMANTAN BARAT) Ahen, Martinus; Nirmala, Azwa; Gunarto, Danang
JeLAST : Jurnal Teknik Kelautan , PWK , Sipil, dan Tambang Vol 9, No 1 (2022): JeLAST EDIS FEBRUARI 2022
Publisher : JeLAST : Jurnal Teknik Kelautan , PWK , Sipil, dan Tambang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jelast.v9i1.52882

Abstract

PDAM Sirin Meragun Kecamatan Sekadau Hilir melayani Desa Sungai Ringin, Mungguk, Tanjung, dan Bokak Sebumbun. Jumlah penduduk terlayani tahun 2020 hanya sekitar 30% dari total jumlah penduduk 28.168 jiwa. Untuk mendukung tingkat pelayanan air bersih pada penelitian ini dilakukan analisis kondisi eksisting dan merencanakan perbaikan menggunakan software Epanet 2.0. Penelitian melalui tiga tahap, pertama menentukan jumlah penduduk dengan metode Aritmatika, Geometrik, dan Least Square. dan dipilih satu metode dengan nilai deviasi terkecil. Kedua menentukan kebutuhan air jam puncak tahun 2020 dan tahun 2040. Ketiga simulasi jaringan distribusi dengan empat kondisi. Satu, kondisi eksisting dengan kebutuhan air tahun 2020. Dua, kondisi alternatif perbaikan jaringan tahun 2020. Tiga, kondisi jaringan dengan kebutuhan air tahun 2040. dan Empat, kondisi alternatif perbaikan jaringan tahun 2040. Proyeksi jumlah penduduk menggunakan metode aritmatika. Kebutuhan air jam puncak tahun 2020 sebesar 82,075 liter/detik, dan tahun 2040 sebesar 128,567 liter/detik. Hasil analisa simulasi satu terdapat pipa tidak memenuhi standar izin unit headloss. Pada simulasi dua dilakukan perubahan dimensi sebagai alternatif perbaikan simulasi satu. Simulasi tiga terdapat pipa tidak memenuhi standar izin unit headloss dan pressure. Pada simulasi empat dilakukan perubahan dimensi dan penambahan jalur pipa sebagai alternatif perbaikan pada simulasi tiga.Kata Kunci : Epanet 2.0, Jaringan, Proyeksi, Simulasi.
Evaluasi Pembiayaan Pembangunan Infrastruktur Pedesaan Gunarto, Danang; ., Trimawan
JURNAL FORUM TEKNIK SIPIL (J-ForTekS) Vol 2 No 1 (2022): Volume 2 Nomor 1 Mei 2022
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (412.472 KB) | DOI: 10.35508/forteks.v2i1.5462

Abstract

Volume estimation and the financial project are essential as technical calculations. This research is to study urban project finances held without proper planning, and the research sample is nine urban. The research method compares the budget available and the estimation calculation based on field observation according to field observation. Unit price analysis use SNI (Standart Nasional Indonesia) method. From the analysis results, the calculated cost and budget ceiling are different. According to field observation, the average budget ceiling is Rp 116,000,000.00, higher than the computed cost of Rp 105,900,000.00. However, according to field observation, the standard deviation of estimation calculation is Rp 46,400,000.00, and the budget is Rp 15,700,000.00. This matter shows that the quality of urban infrastructure projects is varied.
Analysis of Homogeneity of Rainfall Data Between Stations in the Mapat River Catchment Area Helmi, Dani; Nurhayati, Nurhayati; Gunarto, Danang
Portal: Jurnal Teknik Sipil Vol 17, No 2 (2025): October Edition
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/portal.v17i2.8370

Abstract

Abstract — Homogeneous rainfall data is essential in hydrological analysis because it affects the accuracy of calculations and modelling. Inhomogeneity can be caused by environmental changes, topographical differences, or recording errors; therefore, it is necessary to evaluate it before using the data in follow-up analysis. This study aims to test the homogeneity of rainfall data between stations in the Mapat River catchment area, Bengkayang Regency. The data used is the maximum daily rainfall for the period 1993–2022 from six stations: Dawar, Bengkayang, Sanggau Ledo, Karangan, Tebas, and Serukam. The data were directly tested for homogeneity using a two-sided t-test to compare the averages between station pairs at a significance level of 1%. The results of 15 combinations of station pairs showed that the total calculated t-value was smaller than the critical t (2.663), indicating that there was no significant difference in the average maximum daily rainfall between stations. The highest t-value was recorded in the Dawar–Bengkayang pair (2.19), which, although close to the critical limit, remained in the homogeneous category. These findings suggest that the variation in data is due to local climatic factors, rather than differences in instruments or recording methods. Complete homogeneity ensures the feasibility of data for a wide range of hydrological analyses, including river discharge modeling, flood analysis, and water resource management planning. The results of this study also demonstrate the consistency in the management of rain stations in the Bengkayang area over the past three decades.Keywords: rainfall data, homogeneity, double-sided t-test, Rainfall Catchment Area, Mapat River.
Analisis Tingkat Bahaya Erosi di Sub DAS Manday Fung, Nyit; Soeryamassoeka, Stefanus Barlian; Gunarto, Danang
Jurnal Teknologi Lingkungan Lahan Basah Vol 14, No 1 (2026): January 2026
Publisher : Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jtllb.v14i1.95805

Abstract

Erosion is the process by which soil particles are detached and transported from their original location to other areas, primarily driven by water and wind, through the breakdown of soil aggregates (dispersion) and surface runoff. Continuous erosion can lead to sedimentation in rivers, reducing their capacity to carry water and increasing the risk of flooding during periods of high rainfall. However, scientific studies on erosion in the Manday sub-watershed remain limited. This study aims to analyze the extent of erosion occurring in the Manday Sub-Watershed using the Universal Soil Loss Equation (USLE) method combined with Geographic Information Systems (GIS), classify the erosion hazard level (EHL) in the Manday Sub-Watershed, and produce a map of the distribution of erosion hazard levels (EHL) in the Manday Sub-Watershed. The parameters used include the erosivity factor (R), soil erodibility (K), slope length and gradient (LS), land cover (C), and land conservation measures (P). The results of the study show that erosion in the Manday Sub-Watershed amounts to 101,491.44 tons/ha/year, with five erosion hazard levels (EHL) classified: very low, low, moderate, high, and very high, with the very low category covering 176,966.41 ha (56.95%) and the low category covering 92. 773.49 ha (29.86%), while the moderate category accounted for 5.67% (17,618.21 ha), severe for 3.35% (10,397.92 ha), and very severe for 4.17% (12,971.30 ha). Mapping the distribution of erosion hazard levels (TBE) shows that areas with higher TBE are generally on steep slopes with minimal vegetation cover. This mapping underscores the need for targeted land management in high-risk areas to mitigate erosion impacts.
Comparative Analysis of Rainfall-Runoff Model Calibration Using Limited Discharge Data in Landak Sub-Watersheds Teofano, Enrico; Soeryamassoeka, S. B.; Gunarto, Danang
Jurnal Teknik Sipil Vol 25, No 4 (2025): Jurnal Teknik Sipil: Vol 25, No. 4, November 2025
Publisher : Fakultas Teknik Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jts.v25i4.94640

Abstract

The limited availability of long-term discharge data remains a significant challenge for rainfall–runoff modeling in Indonesian watersheds, including the Landak Sub-Watershed. This study aims to evaluate the performance of the Mock and Sacramento rainfall–runoff models in simulating river discharge in the Landak Sub-Watershed during the 2022–2023 period. The data used include rainfall, river discharge, and climatological parameters obtained from relevant institutions. The analysis was conducted through model calibration and validation, with model performance evaluated using the correlation coefficient (r) and the RMSE–Standard Deviation of Observations Ratio (RSR). The results show that the Mock model produced moderate correlation coefficients during both the calibration and validation stages (r = 0.64 and 0.65), but with high RSR values, indicating limited agreement with the observed discharge. The Sacramento model demonstrated better performance, with strong calibration (r = 0.73) and moderate validation (r = 0.66), although the RSR values remained high. Overall, both models can represent flow patterns but are not yet capable of accurately reproducing discharge magnitudes due to data limitations and high rainfall variability
EVALUASI SALURAN DRAINASE DI KOTA NGABANG Pratama, Fadli Mada; Gunarto, Danang; Nurhayati, Nurhayati
JeLAST : Jurnal Teknik Kelautan , PWK , Sipil, dan Tambang Vol 13, No 1 (2026): JeLAST Edisi Februari 2026
Publisher : JeLAST : Jurnal Teknik Kelautan , PWK , Sipil, dan Tambang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jelast.v13i1.106059

Abstract

Sisteim drainasei meirupakan infrastruktur peinting dalam kawasan peirkotaan yang beirfungsi meingalirkan keileibihan air peirmukaan akibat curah hujan untuk meinceigah geinangan dan banjir. Kota Ngabang seibagai ibu kota Kabupatein Landak meimiliki aktivitas peirkotaan yang cukup tinggi, seihingga dipeirlukan sisteim drainasei yang beirfungsi seicara optimal. Namun, pada beibeirapa lokasi masih seiring teirjadi geinangan yang meingindikasikan adanya peinurunan kineirja saluran drainasei. Peineilitian ini beirtujuan untuk meingeivaluasi saluran drainasei dalam meinampung deibit banjir reincana seirta meingeivaluasi kineirja saluran drainasei pada ruas Jalan Beingkayang–Sidas seipanjang ±2,81 km di Kota Ngabang. Meitodei peineilitian meiliputi peingumpulan data primeir beirupa kondisi eiksisting, dimeinsi saluran, dan keiceipatan aliran, seirta data seikundeir beirupa data curah hujan harian seilama 10 tahun teirakhir. Analisis hidrologi dilakukan untuk meineintukan deibit reincana deingan kala ulang 2, 5, dan 10 tahun meinggunakan meitodei distribusi freikueinsi dan meitodei Rasional. Analisis hidrolika digunakan untuk meinghitung kapasitas tampung saluran beirdasarkan peirsamaan Manning. Hasil peineilitian meinunjukkan bahwa beibeirapa seigmein saluran drainasei beilum mampu meinampung deibit reincana, seihingga beirpoteinsi meinimbulkan geinangan. Kondisi teirseibut dipeingaruhi oleih kapasitas saluran yang teirbatas, seidimeintasi, seirta adanya seigmein tanpa saluran drainasei, seihingga dipeirlukan peiningkatan kapasitas dan peimeiliharaan saluran seicara beirkala.
Co-Authors - Kartini ., Trimawan Abdillah, Ma'arif Ade Kurniawan Ahen, Martinus Aji, Panji Septi Akafi, M. Ma'ruf Alfaro, Aldi Amanda, Jessi Apriyandi, - Arianto, Rio Arzita, Tasya Dyta Azwa Nirmala Barage, Lourdes Meirista Candra, Diki Eka Priadi EKO YULIANTO Endyi, - Erwanda, Ery Fakhrully, Ya' Dhally Fattah, Fathan Abdul Fiqih Rahmanto Firdayati, Rafi' Fitri Meliana, Fitri Fung, Nyit Hamiah, Wan Helmi, Dani Herawati, Henny Hestiningrum, Mellenia Irmansah, Muhamad Kartini Kartini Kaslina, Yohana Kembara, Riko Kisnadharma, Abang Gagit Liehan, James Mahendra, Dandy Roffi Miranda, Juwita Mochammad Meddy Danial Muhammad Azhar Irwansyah Muhammad Fikri Nata, Waldi Novelyne, Fiona Gita Nurhadi Nurhayati Nurhayati Pratama, Andikha Pratama, Fadli Mada Ramadhan, Ade Rambe, Adinda Wulandari Nauli Ranate, Chelsea Rivaldy, Arya Riyanda Nurcahyo Sakong, Mila Leonasari Senoaji, Arif Silalahi, Kevin Aglesio Simanjuntak, Nunut Rialdi Soefani, Safira Milenia Sood, Muhammad Furqan Stefanus Barlian Soeryamassoeka Suci Suci, Suci Sutopo, Suryo Teofano, Enrico Umar Umar Umar Umar Umar, - Winardi Winardi