Page - 474 - in Book of Full Papers - Symposium Hydro Engineering

Jatiluhur reservoir. So in the Citarum cascade reservoir operation, Jatiluhur reservoir acts as a buffer against two reservoirs above it. This is contradictory to the principle of operation of reservoirs equal-sharing requiring a balance of clean containment proportions for each constant fixed reservoir and avoiding changes in water level in each reservoir to change drastically from month to month. Changes in the operating principle of Citarum cascade reservoir will have implications for the economic potential value generated from electricity generation. Therefore, in accordance with the idealism in the management of natural resources in the Citarum River Region unit to achieve independence, the economic value of water must be accommodated in the Citarum cascade reservoir operation. At the present stage, the adaptation of Citarum's cascade reservoir operation to reduce the impact of climate change is done by optimizing the capacity of the container to hold water in the wet season as much as possible in the dry season but by providing space for flood control. In addition to water availability adaptation, adaptation of water needs through on-demand irrigation management and improved rainwater catchment conditions to improve retention capacity as well as efforts to hold water forever in the area upstream activities such as increasing capacity through the construction of water catchments to rainwater harvesting and water reuse. CONCLUSION Climate change is a world problem and one way to reduce the impact of climate change is by using renewable energy sources, such as hydropower. On the contrary, with the influence of climate change, especially on hydrological regimes that are closely linked in reservoir operations, the operation of the reservoir needs to be strengthened by considering these conditions in its operations to reduce its impact. Climate change must be understood as one of the business risks that can result in the decline in electricity production. This should also be considered in terms of operation and management of reservoirs. The hydrological regime in the Citarum River is changing, as indicated by the higher flow rate fluctuation and the higher coefficient of run-off and the indication of seasonal leap, the longer the dry season, the shorter rain time with the greater intensity requires that adaptation of Citarum cascade reservoir operation to mitigate the impacts of climate change, by optimizing the capacity of containers to hold water in the wet season as much as possible for the needs in the dry season but by providing space for flood control. The greatest capacity of Ir. H. Djuanda dam reservoirs is the value of adaptation capacity in the Citarum cascade reservoir operation so that in the Citarum cascade reservoir operation, Ir. H. Djuanda reservoir acts as a buffer against two reservoirs above it. Adaptation of water demand through on-demand irrigation management and improved rainwater catchment conditions to increase retention capacity as well as efforts to hold water forever in upstream areas such as increasing capacity through the construction of water catchments up to rainwater harvesting and water reuse. 474