OPTIMASI OPERASIONAL BENDUNGAN LEUWIKERIS BERBASIS NILAI MANFAAT

Abstract

Citanduy River has an area of 48,000 ha with a water availability of 5.30 billion m3/year or the equivalent of 170 m³/second. Based on the 2014 Citanduy River Basin water supply plan, the need for irrigation, RKI (Household, City, and Industry) and other needs has a total of 86,73 m³/second, but only 78.30 m³/second can be fulfilled. Leuwikeris dam is expected to provide irrigation water of 11,216 ha, raw water of 0.845 m³/second and hydropower of 20 MW, therefore a study of reservoir operation patterns is needed to determine the most optimal operating pattern for water supply and electricity production based on the value of its benefits. This study begins with generating PDA Cirahong discharge data for 50 years, the data is processed to obtain the reservoir discharge and irrigation water requirements, raw water and hydropower potential, ending with optimization and reservoir operation patterns simulation. The analysis results obtained from data generation in 2022-2072, the largest discharge value is 197,171 m3/second and the smallest is 14,002 m3/second. The maximum irrigation water requirement for rice at the beginning of the operating year (2024) is 28,294 m³/second and for secondary crops 11,769 m³/second, raw water needs is 10,49 m³/second, and hydropower water needs at a minimum condition of 18,67 m³/second with a power of 9 MW and at a maximum condition of 39,414 m³/second which produces a power of 19 MW.