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All Journal REKAYASA Waskita: Jurnal Pendidikan Nilai dan Pembangunan Karakter TEKAD : Teknik Mengabdi
Utami, Rizki Tri
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Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Education Electrical & Electronics Engineering Engineering Environmental Science Languange, Linguistic, Communication & Media Physics Social Sciences Other

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Optimasi Model Natural Rural Electrical Cooperation Agency Untuk Memprediksi Debit Aliran Bulanan di Sub DAS Lesti Suhartanto, Ery; Andawayanti, Ussy; Dara Lufira, Rahmah; Utami, Rizki Tri
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.31267

Abstract

Climate change and land use change in the Lesti Sub-DAS increase the risk of flooding and land degradation, requiring reliable flow predictions to support water resource management. However, the performance of the NRECA model in predicting monthly flows in this region is still not optimal because calibration-validation strategies and the use of environmental parameters have not been systematically studied. This study optimizes the NRECA model to predict monthly discharge for the period 2011-2020 in the Lesti sub-watershed by calibrating the GWF and PSUB parameters based on rainfall, evapotranspiration, and watershed morphometry data in three data division scenarios (70:30, 80:20, and 90:10 for calibration:validation). The results show that all scenarios produce excellent performance with calibration Nash-Sutcliffe Efficiency (NSE) values between 0.99491-0.99561 and correlation coefficients (R) between 0.99746-0.99785, while validation yielded NSE values between 0.89112-0.97227 and R between 0.49959-0.81520. The best scenario was obtained with a combination of 8 years of calibration and 2 years of validation, with NSE = 0.99561 and R = 0.99785 at the calibration stage, and NSE = 0.97227 and R = 0.81512 at the validation stage, indicating the model's ability to consistently represent monthly discharge variations. The similarity between the model discharge pattern and observations during the base and peak flow periods indicates that GWF optimization specifically improves the representation of base flow response. This study contributes by presenting an optimization-based calibration-validation scheme for the NRECA model, which can be used as a reference in conservation planning and reservoir operation management in watersheds with limited data.
Fostering Environmental Character through Community-Based Groundwater Recharge Education in Coastal Lovina, Bali Lufira, Rahmah Dara; Marsudi, Suwanto; Yuliani, Emma; Suhartanto, Ery; Hendrawan, Andre Primantyo; Utami, Rizki Tri
Waskita: Jurnal Pendidikan Nilai dan Pembangunan Karakter Vol. 10 No. 1 (2026): WASKITA: Jurnal Pendidikan Nilai dan Pembangunan Karakter
Publisher : PUSAT MPK UNIVERSITAS BRAWIJAYA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.waskita.2026.010.01.6

Abstract

Seawater intrusion and declining groundwater quality in coastal Lovina require more than purely technical responses that contribute to cultivating environmental values and the character of local communities. This paper describes a community-based education design for groundwater conservation through an infiltration-well siting plan and a pilot biopore installation in Kalibukbuk Village, Buleleng, Bali. We employed a participatory community service approach that integrated stakeholder coordination and interactive discussions with village authorities, community leaders, residents, and managers in charge of public facilities. Field observations were also performed to validate local constraints and opportunities for infiltration. Inputs from these discussions were synthesized into a context-based siting plan, which then guided the installation of four pilot biopores in a public area. The program was evaluated qualitatively using participatory observation and structured feedback collected during coordination meetings, site visits, and implementation activities. Results include an initial technical planning package identifying potential locations for infiltration wells and biopores, successful installation of four pilot biopores, and early indications of strengthened daily practices aligned with environmental character, such as organic-waste segregation for composting and improved groundwater-conservation literacy. These findings suggest that value education linked to tangible conservation actions can enhance community readiness for more sustainable groundwater management in coastal settings.
Technical Planning for Infiltration Well Siting and Biopore Implementation to Mitigate Seawater Intrusion in Kalibukbuk Village, Lovina, Bali Lufira, Rahmah Dara; Marsudi, Suwanto; Yuliani, Emma; Suhartanto, Ery; Hendrawan, Andre Primantyo; Utami, Rizki Tri; Wicaksana, Roihan Dzaki; Kadarsan, Abid Ghaisan Putra; Febrianasari, Dhea Ayudhita; Rahmayanti, Meylidya Azahro; Asyifa, Innaka Roman; Lubis, Audy Ichwanda Shabrina
TEKAD : Teknik Mengabdi Vol. 5 No. 2 (2026)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.tekad.2026.05.2.3

Abstract

Seawater intrusion in the coastal aquifer of Lovina, Kalibukbuk Village, Bali, has the potential to reduce groundwater quality and increase the vulnerability of domestic services and tourism-based economic activities. This Community Service Program aimed to develop the technical planning for infiltration-well placement, determine its implementation points, and implement biopores as a participatory groundwater conservation measure. The implementation methods included coordination with the village government and school partners, repeated field surveys to assess land contours and hydrogeological conditions, identification of household wells to obtain an indicative picture of the interface zone (freshwater–saltwater boundary), and preparation of an initial technical design (site criteria, construction requirements, and implementation stages) as the basis for village-scale infiltration-well development. In this program, the PKM team completed the technical planning and determination of infiltration-well locations, while the physical construction was continued by the village community as a follow-up to the program with financial support from PKM funding. A rapid intervention was carried out through the installation of biopores at four priority points in the Pura Banyualit area, accompanied by maintenance socialization and documentation as educational media. Supporting programs, including Eco Smart Bin, composting training, simple water filtration, literacy activities, and health training, were integrated to strengthen pro-environmental behavior and social resilience. The results showed increased community understanding and engagement regarding seawater intrusion issues, the availability of site recommendations that met the technical criteria for infiltration-well construction, and positive acceptance of biopores as a simple and easily replicable technology. This approach provides a technical foundation for further infiltration-well development and initial evidence of biopore implementation for groundwater conservation in coastal areas.
Co-Authors Andre Primantyo Hendrawan Asyifa, Innaka Roman Emma Yuliani Ery Suhartanto Febrianasari, Dhea Ayudhita Kadarsan, Abid Ghaisan Putra Lubis, Audy Ichwanda Shabrina Rahmah Dara Lufira Rahmayanti, Meylidya Azahro Suwanto Marsudi Ussy Andawayanti Wicaksana, Roihan Dzaki