Evaluation and Simulation of the Operation Pattern of the Ir. H. Djuanda Reservoir

Ir. H. Djuanda Reservoir provides water for raw water communities, industries, irrigation, hydropower, etc. The study evaluated and simulated the operating patterns of Ir. H. Djuanda Reservoir. The calculation results show that the discharge data used from 1974 to 2018 were conducted as a homogeneity test that has resulted in inhomogeneous data and can be used. Then, synthetic discharge prediction is made stochastic with the Thomas-Fierring method, producing synthetic data with a statistical value like the historical data. Based on the Ir. H. Djuanda reservoir operating pattern plan evaluation 2019, the actual water level condition (average) in 2019 is still between the two states of the previously planned limit. The highest head occurred in June at 106,184 m, and this condition is still below the normal limit of the plan of 106.28 m. While the lowest charge occurred in January at 92.53 m, it is still above the normal limit under the scheme of 90.06 m. ROPP simulation results in 2025, 2030, and 2035 show that the volume and storage of the Ir. H. Djuanda reservoir will constantly decrease until 2035.