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PRIORITAS PEMELIHARAAN IRIGASI SUB DAS KALI BRANTAS KOTA BATU MENGGUNAKAN METODE SIMPLE ADDITIVE WEIGHTING Cholilu Rohman; Umboro Lasminto; Theresia Sri Sidharti
Journal of Civil Engineering Vol 33, No 2 (2018)
Publisher : Institut Teknologi Sepuluh Nopember

This paper presents the results of the study of one of the alternative decision support systems in determining the priority of irrigation maintenance. One of the obstacles in maintaining irrigation assets is the limited budget, hence the need for priority maintenance of irrigation. Batu City as an agricultural area, has not applied objective assessment criteria in determining the priority scale of irrigation asset maintenance to support the success of agriculture. Especially the irrigation area of Kali Brantas Sub Watershed which is the downstream area of Batu City, there are still many damaged irrigation assets infrastructure. This study aims to determine the priority of irrigation maintenance of Kali Brantas Sub Watershed Batu City. Analysis using Simple Additive Weighting method with the following stages: The assessment of each criterion directly in the field (Physical Condition, Functioning, Service Area and maintenance cost) according to Regulation of Minister of Public Works No. 13 / PRT / M / 2012, , determine the rating of each alternative match, normalization of alternative value of each criterion and ranking of normalization product with weight of importance. The result of the analysis shows that irrigation infrastructure which become the first priority in irrigation maintenance activity of Kali Brantas Sub Watershed Batu City is Genengan Dam. For second priority up to five consecutive are; Bend Beji I, Beji II, Ngukir Mranak II and Ngukir Mranak I Dam..

ANALISIS BIAYA UNTUK PEMILIHAN SUMBER DAYA LISTRIK UTAMA RUMAH POMPA GREGES Yudiono Yudiono; Umboro Lasminto; Vita Ratnasari
Journal of Civil Engineering Vol 33, No 1 (2018)
Publisher : Institut Teknologi Sepuluh Nopember

The central government through the Directorate of Environmental Sanitation Development (PPLP) of the Directorate General of Human Settlements of the Ministry of Public Works and Public Housing participated in the implementation of drainage of Surabaya by providing assistance for the construction of Greges pump house. The pump house Greges as one of the pump house located in Surabaya, is one of the drainage system controllers around Bozem Morokrembangan area especially the flow of water along the Greges channel which is also an outlet for several channels. In the aid of the pump house choose to use Genset as the main power source (SDL). While the Government of Surabaya always wants the use of SDL from PLN. The purpose of this study was to analyze the use of SDL to meet the needs of the Greges Pump House by performing the cost analysis required for the Greges pump house for the use of Genset and PLN power sources, and determining the better SDL selection that would be used to meet the needs of the Greges pump house. Based on the analysis of costs, the use of generators is better than PLN in the investment cost analysis. Based on PLN operational cost analysis is better than generator. In the first year period the total cost for the use of PLN is Rp. 5.102.223.905 greater than the generator Rp. 4.789.084.970,16,, in the second year the cost of using PLN approaches the generator cost, and on the third and so the use of generator is higher than the PLN.

Prediksi Hidrograf Aliran Daerah Aliran Sungai Rejoso Kabupaten Pasuruan akibat Perubahan Tata Guna Lahan dan Curah Hujan Julian Khoidir Mujibadi; Umboro Lasminto
Jurnal Aplikasi Teknik Sipil Vol 18, No 2 (2020)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Tujuan dari penelitian ini untuk memberikan analisa debit aliran pada DAS Rejoso Kabupaten Pasuruan pengaruh perubahan tata guna lahan dan curah hujan menggunakan HEC-HMS (Hydrology Engineering Center-Hydrologic Modeling System). Penutupan lahan yang digunakan dalam analisis ini terdiri dari peta penurupan lahan kabupaten pasuruan tahun 2016 serta penutupan lahan sesuai Rencana Tata Ruang dan Wilayah (RTRW) Kabupaten Pasuruan yang diterbitkan oleh Badan Perencanaan Pembangunan Daerah (BAPPEDA) Kabupaten Pasuruan. Curah hujan masa depan diproyeksi dengan menggunakan model CSIRO dengan skenario RCP 4.5 yang di downscalling menggunakan metode bias correction. Hasil pemodelan HEC-HMS, limpasan pada penutupan lahan sesuai RTRW 2009-2029 dengan curah hujan proyeksi tahun 2029 cenderung lebih besar daripada penutupan lahan tahun 2016. Kenaikan curah hujan dengan rata-rata 17% mengakibatkan peningkatan limpasan rata-rata sebesar 4,27% pada penutupan lahan tahun 2029. Dari hasil pemodelan skenario 2 dan skenario 3 didapatkan hasil bahwa perubahan curah hujan lebih berpengaruh dibandingkan perubahan tata guna lahan terhadap hidrograf aliran DAS Rejoso.

STUDI POTENSI TAMPUNGAN HULU DPS SUNGAI SAMPEAN UNTUK PENGENDALIAN BANJIR DAN PENYEDIAAN AIR BERSIH Umboro Lasminto
Purifikasi Vol 10 No 1 (2009): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25983806.v10.i1.158

Floods in Kabupaten Situbondo and Bondowoso were caused by overtopping of Sampean River. This paper discusses a study on control of Sampean River by utilizing the potential upstream reservoir. The upper reservoir was used to receive part of the rain water, so that the discharge to the main river could be reduced and the stored water can be used as water resource and water conservation. The discharge through the Sampean River was much greater than the flow capacity. The results of the survey and analysis indicated that eleven locations were potential for reservoir. These locations were dam sized sites in the main river, and ten locations in the tributaries of small dam size. The Tasnan dam had a potential water storage capacity up to 3.1 million m3, whereas the small dams were of 100,000 to 500,000 m3. By analyzing the 50-year raining return period, the Tasnan dam potentially reduced the floodi as much as 99.5 m3/s. The small dams of Walidono 1, Walidono 2, and Cangkring can reduce the discharge up to 5.9, 3.9, and 2.2 m3/s, respectively. Meanwhile, the small dams of Mandiro, Selolembu, Pandak, Pakis, Gubri 1, Gubri 2, and Cabang only had very small potential capacities in reducing the flood.

Sensitivity Analysis of Calibration in the Water Evaluation and Planning (WEAP) Model for Water Resource Management in Keyang, Slahung, Sungkur Watershed Belia Tatika Arno Dianeka; Umboro Lasminto
Journal of Civil Engineering Vol. 40 No. 2 (2025)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v40i2.7253

Water availability is a critical issue as population growth increases, while water resources remain limited and insufficient to meet rising demand. This is evident in the Keyang, Slahung, and Sungkur sub-watersheds in Ponorogo Regency, East Java, which suffer from drought during the dry season and flooding in the rainy season. To support sustainable water resource management, accurate modelling tools are needed to reflect real field conditions. The Water Evaluation and Planning (WEAP) model is commonly used to simulate integrated water resource management, and model calibration is essential to ensure its reliability. This study employed the soil moisture method, which requires data on water availability from both surface water and groundwater, as well as water demand data across domestic, non-domestic, irrigation, and livestock sectors. Model calibration resulted in optimum parameter values: Z1 = 0, Z2 = 0, DWC = 1000, DC = 250, RRF = 10, RZC = 300, SWC = 1000, and PFD = 0.05. Based on these values, the model achieved a Nash-Sutcliffe Efficiency (NSE) of 0.85 (good category), RMSE of 5.35 (good enough), PBIAS of 19.99 (good enough), R² of 0.84 (medium influence), and MAPE of 0.42 (very accurate). These results confirm that the model reliably represents actual hydrological conditions in the study area.

Enhancing Flood Detection in Surabaya: A Comparative Study of VV and VH Polarizations with Sentinel-1 Data Hafizhah Ashilah; Umboro Lasminto
Journal of Civil Engineering Vol. 40 No. 1 (2025)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v40i1.7272

Flood mapping is critical to strengthen urban resilience, particularly in Surabaya,where flooding is a major and recurring threat. Sentinel-1 satellite data offerssignificant advantages for flood model calibration due to its high-resolution imageryand frequent revisits. This study utilizes Google Earth Engine to process and analyseSentinel-1 data for mapping flood extents using two different polarizations: VV andVH. The research compares the capabilities of these polarizations in detecting floodareas. The results show that VV polarization consistently identifies a larger flood areacompared to VH polarization under similar processing conditions. However, theKappa coefficient was used to assess classification accuracy, with VV achieving aKappa of 0.8 and VH reaching a higher Kappa of 0.92, reflecting better classificationperformance. These findings suggest that while VV provides a broader flooddetection, VH offers more reliable flood mapping, highlighting the trade-offs betweensensitivity and accuracy in flood monitoring using Sentinel-1 satellite.

Comparison of Flood Hydrograph of Manikin Dam Watershed Using Synthetic Unit Hydrograph Method, HEC-HMS and Rain on Grid Model with HEC-RAS 2D Mariano Ado Galot Pukan; Umboro Lasminto
Journal of Civil Engineering Vol. 40 No. 1 (2025)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v40i1.7275

Manikin watershed is located in Kuaklalo Village which borders Bokong Village, Taebenu Subdistrict, Kupang Regency, East Nusa Tenggara Province which has an area of 49.31 km2 with a river length of 8.62 km which has a semi-arid climate with a fairly high annual rainfall of around 1000 - 1500 mm. This study aims to compare the design flood discharge and peak hour with Nakayasu Synthetic Unit Hydrograph (HSS) method, GAMA I, HEC-HMS and rainfall discharge model with HEC_RAS 2D in Manikin Dam watershed. In this study, 6-hour rainfall witha return period of 50 years and 100 years was used. Based on the analysis results, the calculation of the hydrological numerical model flood discharge with the HEC-HMS method with a return period of 50 years and 100 years is 511.90 m³/s and 599.30 m³/s with a peak time at the 4th hour. The peak discharge valuesobtained using the Nakayasu Synthetic Unit Hydrograph and GAMA I methods with a return period of 50 years and 100 years are 342.11 m³/s, 381.14 m³/s and 406.44 m³/s, 456.13 m³/s, and the peak time obtained at SUH Nakayasu is 3 hours and GAMA I is 4 hours. Numerical model results with HEC-RAS 2D v6.6 with 6hours of rainfall on the grid obtained peak discharge Hydrograph values for the 50-year and 100-year return periods of 494.86 m³/s and 604.88 m³/s, with the peak time at the 5th hour. Therefore, the largest peak discharge and peak time results were obtained from the HEC-HMS method among the three SUH formulas and HEC-RAS calculations

PRIORITAS PEMELIHARAAN IRIGASI SUB DAS KALI BRANTAS KOTA BATU MENGGUNAKAN METODE SIMPLE ADDITIVE WEIGHTING Cholilu Rohman; Umboro Lasminto; Theresia Sri Sidharti
Journal of Civil Engineering Vol. 33 No. 2 (2018)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v33i2.7488

This paper presents the results of the study of one of the alternative decision support systems in determining thepriority of irrigation maintenance. One of the obstacles in maintaining irrigation assets is the limited budget, hence the needfor priority maintenance of irrigation. Batu City as an agricultural area, has not applied objective assessment criteria indetermining the priority scale of irrigation asset maintenance to support the success of agriculture. Especially the irrigationarea of Kali Brantas Sub Watershed which is the downstream area of Batu City, there are still many damaged irrigationassets infrastructure. This study aims to determine the priority of irrigation maintenance of Kali Brantas Sub Watershed BatuCity. Analysis using Simple Additive Weighting method with the following stages: The assessment of each criterion directly inthe field (Physical Condition, Functioning, Service Area and maintenance cost) according to Regulation of Minister of PublicWorks No. 13 / PRT / M / 2012, , determine the rating of each alternative match, normalization of alternative value of eachcriterion and ranking of normalization product with weight of importance. The result of the analysis shows that irrigationinfrastructure which become the first priority in irrigation maintenance activity of Kali Brantas Sub Watershed Batu City isGenengan Dam. For second priority up to five consecutive are; Bend Beji I, Beji II, Ngukir Mranak II and Ngukir Mranak IDam.

ANALISIS BIAYA UNTUK PEMILIHAN SUMBER DAYA LISTRIK UTAMA RUMAH POMPA GREGES Yudiono Yudiono; Umboro Lasminto; Vita Ratnasari
Journal of Civil Engineering Vol. 33 No. 1 (2018)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v33i1.7497

The central government through the Directorate of Environmental Sanitation Development (PPLP) of theDirectorate General of Human Settlements of the Ministry of Public Works and Public Housing participated in theimplementation of drainage of Surabaya by providing assistance for the construction of Greges pump house. The pump houseGreges as one of the pump house located in Surabaya, is one of the drainage system controllers around BozemMorokrembangan area especially the flow of water along the Greges channel which is also an outlet for several channels. Inthe aid of the pump house choose to use Genset as the main power source (SDL). While the Government of Surabaya alwayswants the use of SDL from PLN. The purpose of this study was to analyze the use of SDL to meet the needs of the GregesPump House by performing the cost analysis required for the Greges pump house for the use of Genset and PLN powersources, and determining the better SDL selection that would be used to meet the needs of the Greges pump house. Based onthe analysis of costs, the use of generators is better than PLN in the investment cost analysis. Based on PLN operational costanalysis is better than generator. In the first year period the total cost for the use of PLN is Rp. 5.102.223.905 greater thanthe generator Rp. 4.789.084.970,16,, in the second year the cost of using PLN approaches the generator cost, and on the thirdand so the use of generator is higher than the PLN.

The Impact Of Tide On Flooding In The The Kali Welang, Pasuruan, East Java Ainun M. M. Gasa; Umboro Lasminto
Journal of Civil Engineering Vol. 40 No. 3 (2025)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v40i3.9322

Flooding in the Welang River, Pasuruan, East Java, is a recurrent problem influenced by multiple factors, primarily high-intensity rainfall and tidal fluctuations. This study aims to quantitatively assess the impact of tidal conditions—including extreme events such as supermoons—on the spatial extent and depth of flood inundation in the downstream segment of the Welang River. Utilizing hydrologic (HEC-HMS) and hydraulic (HEC-RAS) modeling, the research estimates design flood discharges for multiple return periods and simulates three scenarios: (1) flood discharge without tidal influence, (2) flood discharge under normal tidal conditions, and (3) flood discharge during tidal peaks associated with a supermoon. The results indicate that the 100-year design discharge reaches 409.7 m³/s. Tidal conditions significantly amplify both the extent and depth of inundation, with the greatest increase in flood coverage observed at the 2-year return period (85.88%). Furthermore, the supermoon phenomenon intensifies flooding, producing the highest additional inundation extent during the 5-year return period (34.81%).

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