Rule Curve of Meninting Reservoir in West Lombok Regency, West Nusa Tenggara

Authors

  • Natasya Ainun Nisya Universitas Mataram
  • Ery Setiawan Universitas Mataram
  • M. Bagus Budianto Universitas Mataram
  • Hartana Hartana Universitas Mataram

DOI:

https://doi.org/10.46799/ajesh.v4i1.502

Keywords:

Meninting Reservoir, Rule Curve, Water Balance

Abstract

Meninting Reservoir in West Lombok Regency is essential for addressing uneven water distribution on Lombok Island. It reallocates water from the Sesaot, Penimbung, and Ketapang Irrigation Areas, covering 1,490 hectares, and supplies 150 liters/second of raw water while generating 2×0.4 MW of electricity. To ensure equitable water distribution, an optimal rule curve is needed. This study analyzes water demand and availability using the continuity equation. Water availability was assessed based on discharge data from the Orong Atas AWLR station, while demand was evaluated under various scenarios, including different planting schedules and Micro Hydro Power Plant (MHP) integration. Results show that irrigation demand ranges from 1,082,648.92 m³ to 1,496,415.21 m³ per half-month period, while raw water and MHP demands are 197,100 m³ and 2,857,950 m³, respectively. The optimal rule curve is achieved with the October II planting schedule without MHP, ensuring 100% reliability. However, with MHP, the best rule curve occurs under the November I schedule, reducing reliability to 54.2% and increasing failure risk to 45.8% in dry years. These findings emphasize the need for strategic planting schedules and reservoir management to balance irrigation, raw water supply, and hydropower generation. The study provides a scientific basis for optimizing reservoir operations to ensure sustainable water use in West Lombok Regency.

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Published

2025-01-31