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All Journal International Journal of Electronics and Communications Systems Jurnal Teknik : Majalah Ilmiah Fakultas Teknik Unpak JURNAL ABDI MASYARAKAT INDONESIA (JAMIN) International Journal of Civil Engineering and Infrastructure (IJCEI)
Wahyu Gendam Prakoso, Wahyu Gendam
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Transportation Other

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REVIEW KONDISI GEOLOGI PADA EMBUNG KESI DALAM UPAYA PENYIAPAN DAN PENETAPAN IZIN OPERASI BENDUNGAN Pamungkas, Helmi Setia Ritma; Ismiralda, Dinta Anindy; Prakoso, Wahyu Gendam; Solihin, Solihin
Jurnal Teknik | Majalah Ilmiah Fakultas Teknik UNPAK Vol 25, No 1 (2024): Jurnal Teknik : Majalah Ilmiah Fakultas Teknik UNPAK
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/teknik.v25i1.10200

Abstract

ABSTRAK Provinsi Nusa Tenggara Barat adalah salah satu Provinsi di Indonesia yang memiliki musim kemarau lebih panjang dibandingkan musim hujan, sehingga Pemerintah Indonesia merencanakan Pembangunan embung maupun bendungan yang lebih banyak di provinsi tersebut. Embung Kesi adalah salah satu embung yang terletak di NTB yang dibangun pada tahun 1998 dengan volume tampungan 570.000 m3 dengan tinggi embung 15 meter dan panjang bendungan 154 meter. Ukuran fisik embung Kesi dalam klasfikasi bendungan menurut Peraturan Menteri Pekerjaan Umum dan Perumahan Rakyat Nomor 27/PRT/M/2015. Maka perlu diperlukan review kondisi Geologi Pada Embung Kesi Dalam Upaya Penyiapan dan Penetapan Izin Operasi Bendungan. Tujuan dari penelitian ini adalah meninjau ulang (review) kondisi bendungan dari aspek geologi pada Embung Kesi dalam persiapan bahan kajian teknis untuk mendukung persyaratan teknis dengan tujuan mendapatkan persetujuan Izin Operasi Bendungan. Metode yang digunakan adalah pemetaan geologi dan analisis deskriptif dari as built Embung Kesi, topografi, tutupan lahan, geologi, dan nilai spektrum respon desain. Hasil penelitian menunjukan bahwa bahwa sesar normal berarah barat-timur pada Satuan Batuan Batupasir Nodul kerikil Sisipan Batulempung menjadi penyebab utama turunnya tubuh Embung Kesi. Gempa sebagai pemicu sesar tersebut kemungkinan aktif kembali. Dari hasil analisis nilai spektrum respon desain, percepatan kegempaan di permukaan pada Embung Kesi memiliki nilai 0,506 gal, artinya wilayah tersebut termasuk dalam klasifikasi zona kerentanan gempabumi tinggi. Akan tetapi kerusakan tubuh Embung Kesi tidak signifikan karena adanya peredam guncangan berupa breksi lahar dan lava andesit yang menjadi batuan dasar dari tubuh Embung Kesi. Dalam syarat sebuah bendungan, Embung Kesi memiliki kesesuaian dalam 3 parameter yaitu tinggi bendungan, daya tampung, dan in stream. Kata kunci : Review, aspek geologi, Embung Kesi ABSTRACT West Nusa Tenggara Province is one of the provinces in Indonesia that has a longer dry season compared to the rainy season. As a result, the Indonesian Government plans to construct more retention basin and dams in this province. Kesi retention basin is one of the retention basins located in West Nusa Tenggara, built in 1998 with a storage volume of 570,000 m³, a reservoir height of 15 meters, and a dam length of 154 meters. The physical size of Kesi retention basin is classified under the dam classification according to the Regulation of the Minister of Public Works and Public Housing Number 27/PRT/M/2015. Therefore, it is necessary to review the geological conditions of Kesi retention basin in the effort to prepare and establish an Operating Permit for the Dam. The aims of research is to review the retention basin condition from a geological perspective at Kesi retention basin as part of preparing technical study materials to support the technical requirements for obtaining approval for the Dam Operating Permit. The method used is geological mapping and descriptive analysis of as built Kesi retention basin, topography, land cover, geology, and design response spectrum values. The results of the study indicate that a west-east trending normal fault within the Gravel Nodule Sandstone with Claystone Intercalations Unit is the main cause of the subsidence of the Kesi retention basin. Earthquakes, which could potentially reactivate this fault, act as a trigger. The design response spectrum analysis results show that the surface seismic acceleration at Kesi retention basin is 0.506 gal, classifying the area as a High earthquake vulnerability zone. However, the damage to the Kesi retention basin body is not significant due to the presence of a shock absorber in the form of lahar breccia and andesite lava which bedrock the Kesi retention basin body. According to the dam criteria, Kesi retention basin meets the requirements in three parameters: dam height, storage capacity, and in-stream suitability. Keywords: Review, Geological aspect, Kesi retention basin
HYDRAULIC DESIGN OF SMALL EARTH CASCADE DAM FOR DRYLAND GOGO RICE PLANTATION Prakoso, Wahyu Gendam; Irawan, Pengki
International Journal of Civil Engineering and Infrastructure Vol 4, No 1 (2024): IJCEI Volume 4 No. 1
Publisher : University Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/ijcei.4.1.1-80

Abstract

The irrigation of gogo rice plantataion on dryland is not extensively developed in Indonesia. Design for the earthfill dam using a combination of hydrological analysis and open-channel hydraulic modeling. Hydrological modeling is conducted by transforming rainfall into runoff using the rainfall- run off model. The hydraulic design involves determining the capacity of the earthfill dam. Hydraulic models and simulations help estimate the potential inflow rates and assess the dam's ability to handle peak flows during extreme weather events. Spillway dimensions are determined based on the dam's design flood criteria, hydraulic modeling, and safety standards. The design of small-scale earthfill dams in cascade to meet the irrigation water needs for dryland paddy plantations in West Tulang Bawang, Lampung, consists of 2 dams (Dam 1: upstream; Dam 2: downstream). Dam 1 effective reservoir 74039 m3, and the inundation area reaches 10846 m2. The inflow discharge is 7.3 m3/second. Total storage volume dam 2 reaching 77023 m3, and the inundation area is 22000 m2. The inflow discharge is 14.18 m3/second. To ensure dam safety, a spillway is designed with an ogee crest using a square-section control with effective widths of 3.0 m for Dam 1 and 4.5 m for Dam 2. Flood reduction in the downstream part of Dam 2 reaches 22% with 10.99 14.18 m3/second outflow discharge and is estimated to be safe to prevent failure due to overtopping hazards. Further research is needed for extreme emergency action plans with simultaneous dam failure scenarios.
The Effect of Cerium Doping on LiTaO3 Thin Film on Band Gap Energy Ismangil, Agus; Subiyanto, Subiyanto; Sudradjat, Sudradjat; Prakoso, Wahyu Gendam; Saepulrohman, Asep
International Journal of Electronics and Communications Systems Vol. 1 No. 2 (2021): International Journal of Electronics and Communications System
Publisher : Universitas Islam Negeri Raden Intan Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/ijecs.v1i2.7906

Abstract

Lithium tantalite LiTaO3 was grown on a Si Type-P (100) substrate by chemical solution deposition and spin coating methods at a speed of 3000 rpm for 30 seconds with an annealing temperature of 800 ° C, 900 ° C. This study aims to determine the effect of temperature variations on the band gap energy. The results show that the energy band gap value of the thin film has a significant impact on the interpretation of annealing temperature. It can be seen that a high energy band gap peak occurs at an annealing temperature of 900 ° C and a time of 15 hours of the energy band gap of 1,49 eV. This shows the effect of temperature variations on the energy band gap to move from the valence band to the conduction band, which will produce current.
FLOOD MODELING AND ECONOMIC IMPACT ON FLOOD-PRONE RESIDENTIAL AREAS IN THE CILOSEH RIVER BASIN, TASIKMALAYA Prakoso, Wahyu Gendam; Irawan, Pengki; Setiawan, Junaedi; Rahmawati, Siti
International Journal of Civil Engineering and Infrastructure Vol. 5 No. 1 (2025): IJCEI Volume 5 No. 1
Publisher : University Muhammadiyah Jakarta

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Abstract

The Ciloseh River in Tasikmalaya City, West Java, spanning approximately 26.6 km with a 7,803-hectare catchment area, faces increasing flood vulnerability driven by rapid urban expansion and land-use conversion along its banks. This study systematically characterizes the river's floodplain morphology and quantifies potential economic losses from flooding across various return periods (2- to 50-year events). A comprehensive morphometric analysis of the watershed was conducted using Geographic Information Systems (GIS) to derive critical hydrological parameters. Flood discharge estimations were performed using the Synthetic Unit Hydrograph Gamma-I method. Hydrological data, augmented by field surveys, informed the development of a robust one-dimensional hydraulic model utilizing HEC-RAS software. The generated hydraulic model outputs were then integrated with high-resolution basemaps to produce detailed flood inundation maps. Economic loss assessments were rigorously performed following the ECLAC methodology, quantifying direct damages to infrastructure and residential properties. The analysis reveals significant flood inundation across all simulated return periods, with the 50-year event (Q50 = 473 m³/s) leading to a substantial inundated area of 46,151 m², affecting 244 residential units, and incurring estimated economic losses of IDR 3,188,421,996 (approximately USD 200,000). These findings provide essential data for developing sustainable flood mitigation strategies, informing urban planning, and guiding resilient infrastructure design in rapidly developing riverine environments. Keywords: Flood risk assessment, Hydraulic modeling, HEC-RAS, GIS, Economic impact, Urban hydrology, River engineering
PENDAMPINGAN TEKNIS MASYARAKAT DESA SIRNAJAYA DALAM MENGHADAPI RISIKO BENCANA TANAH LONGSOR Kamardi, Muhammad Agus; Adhitia, Iit; Prakoso, Wahyu Gendam; Marwanza, Irfan; Karmadi, Muhammad Agus; Hadi, Singgih Irianto Trisilo; Solihin
Jurnal Abdi Masyarakat Indonesia (JAMIN) Vol 5 No 1 (2023): JURNAL ABDI MASYARAKAT INDONESIA (JAMIN)
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jamin.v5i1.16047

Abstract

The hilly area around Situ Rawa Gede is located in Sirnajaya Village, Sukamakmur District, Bogor Regency, with the existence of Situ Rawa Gede surrounded by hills extending from the south to the northwest. Landform changes are increasingly visible in the hilly areas around Situ Rawa Gede due to community gardening activities and coffee agro-tourism, and the opening of settlements causes topsoil to peel off, which is detrimental to the physical condition of the soil, can cause erosion and trigger mass movement of soil/rock. It is necessary to arrange land in the hilly area around Situ Rawa Gede to be appropriately organized. A zoning map of the vulnerability of ground motion is needed; from this map, it can be seen which areas have low to high soil vulnerability. Land management is one of them by making terracing which helps increase water infiltration into the soil and limiting surface runoff to minimize the risk of surface water erosion. This PkM activity provides a technical description of the concept of making a soil movement vulnerability zoning map to the community so that they understand the importance of maps of low to high soil vulnerability zones in their area in disaster mitigation efforts and through technical assistance related to the application of bench terraces and garden terraces so that they can be planted with plantation crops as ground cover is also for the safety of the community and visitors to coffee agro-tourism.
Co-Authors Adhitia, Iit Agus Ismangil Asep Saepulrohman Hadi, Singgih Irianto Trisilo Helmi Setia Ritma Pamungkas Irfan Marwanza Ismiralda, Dinta Anindy Kamardi, Muhammad Agus Karmadi, Muhammad Agus Pengki Irawan Setiawan, Junaedi Siti Rahmawati Solihin Solihin Solihin Sudradjat Sudradjat