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All Journal Jurnal Konstruksi Journal of Geoscience, Engineering, Environment, and Technology Jurnal Konstruksi Innovative: Journal Of Social Science Research
Sulwan Permana
Institut Teknologi Garut
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Evaluasi Kinerja Sistem Irigasi Menggunakan Metode F.J. Mock Sulwan Permana; Febri Gumilar
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.2799

Abstract

Cadas Gantung Weir is a water resources infrastructure that plays an important role in supporting the agricultural irrigation system, particularly in Cibuntu Hamlet, Sindangsari Village, Cigedug District. Water from this weir is used to irrigate agricultural land in the Ciledug area covering an irrigation area of 321.95 ha. The irrigation system is supported by a secondary channel with a length of 950.30 meters. This study aims to evaluate the performance of the Cadas Gantung Weir in supporting sustainable water resource management, food security, and sustainable irrigation systems, which are key components in improving food security. The research method includes analysis of average rainfall data and evapotranspiration (ETo) using the Penman–Monteith method to assess the suitability of water supply to agricultural land requirements. Discharge modeling is carried out using the F.J. Mock method. In January 2015, the maximum discharge was recorded at 44.62 m3/s due to high rainfall and upstream flood inflow. Discharge management is conducted through dynamic regulation of gate openings to prevent overflow and maintain the stability of irrigation water distribution. The results indicate that the Cadas Gantung Weir plays a significant role in supporting the irrigation system in Sindangsari Village through a stable and sufficient water supply.
Analisis Respon Hidrologi DAS Cimanuk Hulu dengan SWAT dan Sacramento akibat Perubahan Tata Guna Lahan Sulwan Permana; Annisa Nur Ilham Al-Jabbar
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.2864

Abstract

Daerah Aliran Sungai (DAS) memilki fungsi sebagai penyangga tata air, namun dalam beberapa tahun DAS Cimanuk Hulu mengalami tekanan akibat perubahan tata guna lahan yang tidak terkendali. Penurunan luas hutan dan meningkatnya area terbangun berpotensi memperburuk kondisi hidrologi, ditandai dengan meningkatnya aliran permukaan serta menurunnya infiltrasi. Tujuan penelitian ini untuk menganalisis perubahan tutupan lahan 2017 dan 2024 serta dampaknya terhadap respon hidrologi pada DAS Cimanuk Hulu. Penelitian ini menggunakan pemodelan hidrologi dengan soil and water assessment Tool (SWAT) Analisis dilakukan melalui deliniasi DAS, pembentukan Hydrological Response Unit (HRU), pembangunan model hidrologi, serta kalibrasi menggunakan data debit harian periode 2015–2022. Penggunaan model Sacramento untuk memperkuat hasil kalibrasi debit sungai. Hasil penelitian menunjukkan bahwa antara tahun 2017–2024 luas hutan berkurang sebesar 1,466ha (3,12%), lahan pertanian menurun 1.137 ha (2,41%), sedangkan area terbangun meningkat 3.110 (6,62%). Perubahan ini berdampak pada peningkatan aliran permukaan (surface runoff), penurunan aliran dasar (baseflow), serta meningkatnya fluktuasi debit sungai. Nilai Koefisien Regim Aliran (KRA) tahun 2024 lebih besar dibandingkan 2017, yang mengindikasikan kestabilan hidrologi DAS menurun. Perubahan tata guna lahan di DAS Cimanuk Hulu secara nyata memengaruhi keseimbangan hidrologi dan meningkatnya risiko banjir pada musim hujan serta kekeringan pada musim kemarau.
Penerapan Model RIBASIM untuk Optimalisasi Pengalokasian Sumber Daya Air Sulwan Permana; Denny Firmansah
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.2914

Abstract

This study discusses the pressure on water availability resulting from population growth, increased economic activities, and changes in river discharge. These conditions create an imbalance between water supply and demand, highlighting the need for more planned and systematic water management. The objective of this research is to optimize the utilization and allocation of water resources in order to meet community needs in an equitable and sustainable manner. The method employed is a quantitative approach using the RIBASIM (River Basin Simulation Model). The research stages include collecting data on water availability and demand, developing management scenarios, and conducting simulations and result analyses to assess system reliability. The novelty of this study lies in the application of RIBASIM as an integrated water allocation optimization tool, utilizing adaptive scenarios to enhance distribution reliability in regions with high discharge variability. The RIBASIM model is used to evaluate how effectively water can be allocated to various sectors such as irrigation, public water supply, and industry. The results indicate discrepancies between water availability and demand that lead to reduced service levels in several sectors. After simulations and the implementation of strategies such as prioritizing water use, adjusting cropping patterns, applying rotational water distribution, and reusing wastewater, the reliability of the water management system improved. Overall, this study demonstrates that the use of the RIBASIM model can support more efficient planning and decision-making in water allocation. This model-based approach supports integrated and sustainable water resource management and can serve as a foundation for enhancing water security and community welfare in the future.
Analisis Sebaran Genangan Banjir Menggunakan Pemodelan HECRAS-2D Terhadap Sosial Ekonomi dan Dampaknya terhadap Sosial Ekonomi di Bayongbong Sulwan Permana; Sofa Tsuroya Aulya
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.2985

Abstract

Flooding is a type of natural disaster influenced by weather conditions and high rainfall, and it remains a major problem in many regions, including Bayongbong District, Garut Regency. The steep topography on the slopes of Mount Cikuray increases the risk of surface runoff, leading to recurrent flooding during the rainy season. This study aims to design flood control measures by utilizing hydraulic modeling based on the HEC-RAS 2D software. The data used include rainfall, river discharge, and a Digital Elevation Model (DEM), which are analyzed using hydrological methods and hydraulic simulations. The hydrological analysis shows that the longer the return period, the greater the flood discharge and inundation. The maximum flood discharge for the 100-year return period reaches 450.9 m³/s, while the inundation volume is 35,563.96 m³. The inundation volume increases with each increase in the return period. Flooding causes significant socio-economic losses to the community. From a social perspective, floods result in housing damage and disruption of daily activities. From an economic perspective, flooding damages agricultural land and infrastructure and reduces community productivity.
Analisis Pemodelan Hidrologi Dan Hidraulika Sistem Drainase Menggunakan SWMM: Studi Kasus: Kecamatan Cisurupan, Garut Sulwan Permana; Fajar Abdul Aziz
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.3042

Abstract

This study evaluates the performance of the drainage system in Cisurupan Subdistrict, Garut Regency, which often experiences flooding due to limited channel capacity. The main objective is to assess the effectiveness of the existing drainage system and formulate improvement alternatives through modeling using the Storm Water Management Model (SWMM) version 5.2. The study uses a descriptive-quantitative approach based on case studies with 10 years of rainfall data, topography, and channel conditions. Hydrological analysis produced a 5-10 year return period rainfall and a maximum intensity of 23.96 mm/hour. SWMM simulation results showed that some channel segments were only able to accommodate 85% of their full capacity, with potential overflow in the JN2–JN3 segment and a peak discharge of 0.21 m³/s. These conditions indicate that the channel capacity is inadequate for high rainfall intensity. Therefore, it is recommended to increase the channel dimensions and construct retention ponds to reduce the risk of flooding. The development of a drainage system, especially in areas that are prone to flooding during rainfall, requires attention, particularly the maintenance of the drainage network.
Analisis Kehilangan Air pada Daerah Irigasi Lagadar Kabupaten Bandung Muhammad Nur Azmi; Sulwan Permana
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.3056

Abstract

Irrigation water plays an important role in supporting the agricultural sector, particularly in Indonesia as an agrarian country. Adequate water availability and proper distribution are key factors in increasing agricultural productivity and ensuring food security. However, water losses due to seepage, leakage, sedimentation, and illegal structures frequently occur in irrigation networks, including the Lagadar Irrigation Area in Bandung Regency, which serves an area of approximately 325 ha. This study aims to analyze the magnitude of water losses and identify the factors causing them. The research adopts a quantitative approach through field studies, involving measurements of inflow and outflow discharge at several channel sections using the float method, as well as analysis of losses due to leakage and seepage using the Moritz equation. Based on discharge measurements conducted over seven consecutive days, the largest water loss was recorded on day 5 at 0.1273 m³/s, while the smallest loss occurred on day 3 at 0.1055 m³/s, with an average water loss of 0.1156 m³/s. These values indicate fluctuations in water losses influenced by the physical condition of the channel and environmental factors. The main factors contributing to water loss are leakage and sedimentation, particularly in the overcrossing sections, which are difficult to maintain, leading to sediment accumulation and a reduction in the effective wetted cross-sectional area. The results of this study are expected to serve as an evaluation reference for irrigation network managers in improving water distribution efficiency and supporting more sustainable water resource management in areas with similar elevation characteristics.
Evaluasi Kapasitas Hidraulik Saluran Irigasi Menggunakan Metode Manning Siti Ulpah Nurazizah; Sulwan Permana; Dendi Yogaswara
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.3057

Abstract

Garut Regency is one of the regions in West Java Province with significant potential in the agricultural sector. One of the key infrastructures supporting these activities is the Cimaragas Irrigation Canal, located in Karangpawitan District. In recent years, this area has frequently experienced flooding due to overtopping of the irrigation canal, which is no longer capable of conveying the flow discharge, particularly during the rainy season. In addition, siltation and the accumulation of sediment and solid waste have further exacerbated the reduction in channel capacity. This study aims to assess water demand and water availability within the Cimaragas irrigation system, as well as to determine the ideal dimensions of the irrigation canal capable of conveying the planned discharge. The research employs a quantitative and descriptive approach, with hydrological and hydraulic analyses using the Manning equation and a trial-and-error method to determine the optimal cross-sectional dimensions. The analysis results indicate that the highest water demand occurs in April, amounting to 413.90 L/s, while the highest water availability also occurs in the same month at 639 L/s, indicating that the study area generally experiences a water surplus. Based on the capacity analysis of a trapezoidal channel section, the optimal dimensions obtained are a bottom width (b) of 5 m, a flow depth (y) of 1.8 m, a side slope (x) of 1.5, and a channel bed slope (S) of 0.005, resulting in an actual discharge of 254.285 L/s, which closely matches the irrigation discharge requirement of 245 L/s. From these results, it can be concluded that the existing irrigation canal is no longer adequate to convey the actual discharge, and therefore improvements and dimensional modifications are required by the Government of Garut Regency. This study provides technical recommendations for increasing the capacity and efficiency of the irrigation network to support the sustainability of the agricultural sector. The findings may serve as a basis for planning canal rehabilitation by local authorities to minimize flood risk and optimize irrigation water distribution.
Optimasi Pemanfaatan Sumber Air Untuk Irigasi Berkelanjutan Menggunakan Metode F.J. Mock dan CROPWAT 8.0. Sulwan Permana; Muhammad Diki Paris
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.3060

Abstract

The Indralayang area, Garut Regency, has high agricultural potential but often faces challenges in managing water resources due to fluctuations in availability and irrigation demand. This study aims to analyze water resource availability, irrigation water requirements, and determine the most efficient irrigation techniques to support sustainable agriculture systems. The analysis was conducted using the F.J. Mock water balance method to estimate water availability and CROPWAT 8.0 simulations to calculate evapotranspiration, effective rainfall, and crop water requirements.The results show that irrigation water demand amounts to 27,090.83 liters/second, while water availability reaches 29,477.35 liters/second. This indicates a water surplus of 2,386.52 liters/second, with a demand-to-availability ratio of approximately 91.9%, meaning that water resources are sufficient to meet the irrigation needs of 696 hectares of farmland. Given the relatively abundant water supply, the most appropriate irrigation technique is surface irrigation (gravity surface irrigation), complemented by land leveling, channel improvements to reduce water loss, and the application of the Alternate Wetting and Drying (AWD) method in rice fields to enhance water use efficiency.This study contributes to the planning of sustainable irrigation systems in lowland agricultural areas.  
Co-Authors , Sahrirudin Abdal Azziz Abdullah Syafe'i Aceng Nurkholis Majid Adhitya Surya Pratama Adi Muhammad Aripin Adi Susetyaningsih Aditya Ramdhani Pratama Adri Triadi Agun Gunawar Ai Dini Andriani Almiansyah Nurdin Alwin Andika Andri Setiawan Anjas Ninda Hantari Annisa Nur Ilham Al-Jabbar Ayu Nur Isti Ajijah Azka Mutsla Fauzan Azqia Fhairiza Rusmana Dendi Yogaswara Denny Firmansah Depi Prayogi Diana Puspa Ramadhan Dicky Muhamad Fadli Eko Walujodjati Eko Walujodjati Endang Adi Juhana Endang Andi Juhana Erwin Nadinoor Fajar Abdul Aziz Farhan Fauzaan A Febri Gumilar Hadi Nurhuda Hanifah Nurfauziah Hendi Hamdani Ida Farida Ida Farida Indra Lukman Nul Hakim Irgi Agustian Ita Warsita Jani Albas Lukman Rudiat M. Sandi Kurniawan Saputra Martha Puspa Vaniati Mirza Fathir Moch Lukman Nul Hakim Muhamad Alwan Fauzan Muhammad Diki Paris Muhammad Nur Azmi Muthi’ah Hudaedi Neng Nenti Fajriyanti Noni Nuraeni Pamella M. Sri Rezeki Rena Ruspa Rian Hidayatullah Ridwan Alamsyah Rika Banowati Risna Merliana Rizal Nurhakim Rizki Kurniawan Robby Maulana Sopa Roestaman Roestaman Roestaman Roestaman Sena Arian Sin Sin Husnul Rizal Siti Ulpah Nurazizah Siti Yuni Yuningsih Sofa Tsuroya Aulya Subhan Mulyana Taupik Saepul Rohman Tendi Rismansyah Tintin Kartini Tri Astita Gunawan Tutin Mustaatinah Widya Prima Mulyana Yaumil Wahdan Yoga Adela Yuda Yudistira Yusri Fisabili Shaffan