The multi-reservoir operation rules require accuracy in developing its technical parameters. This is done to prevent operational failure in one of the reservoirs. The water transfer concept is to manage the water resources distribution between the receiving watershed and the donor watershed. The availability of transferable water must prioritize meeting the water needs of the donor reservoir. The use of storage capacity in both reservoirs aims to meet water needs, especially in the recipient. The location and capacity of the interconnected tunnels will determine the operation pattern of the multi-reservoir. The reservoir operating rule is expected to be a reference in the multi-reservoirs operation to obtain an optimal reservoir operating rule.