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Brantas River is a major river in East Java, Indonesia, having approximately 12.000 km2 basin area and 320 km length. The river became the main water sources in the area through 4 large cascade dams at the upstream, which are Sengguruh Dam, Karangkates Dam, Wlingi Dam, and Lodoyo Dam. Mixed Integer Linear Programming (MILP) method has been inroduced for optimization modelling. The data to be used in the model is ten-day-period (decade) of discharge data from December 2011 to November 2012 to be converted to seasonal data. The aim of the optimization is to maximize the profit of the farm (irrigation) in Lodagong Irrigation Area to gain the energy production in Sengguruh Dam, Karangkates/Sutami Dam, Wlingi Dam, and Lodoyo Dam (hydro power plant). From the optimization modeling based on water allocation obtained that maximum benefits from both irrigation area and energy generation is IDR 903.92 billion; which is the best value comparing with optimization modeling based on the maximizing irrigation benefits of IDR 883.58 billion and based on maximizing energy benefits which is IDR 841.03 billion.
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