A water resources system was a set of structural and nonstructural measures and activities for purpose of developing or improving existing water resources for the benefit of human use The main objective of water resources planning and management is to solve the equation of demand and supply of water resource for a specific area taking into account various dimensions like space, time, economy, politics, environment, and other aspects. Also, water management means the reconciliation of all users, preservation of water and related land resources, and previous of enough water for constantly expanding needs. Indonesia was agricultural country, so that the important aspect of water resources developments used for irrigation. Some rivers on Indonesia were progressive developed latterly. Restriction of surface water resources, mainly in dry season intensify the need for an optimum capacity and operation for multi purposes reservoir systems. Thus, it was needed to allocate the water use as efficient as possible. To reach this target, it was needed to make a system model for optimization. Optimization analysis would give more information for allocating water of each objective function.