ABSTRACT

Gembleng Dam is located between Aliyan Village, Rogojampi District and Parijatah Wetan Village, Srono District, Banyuwangi Regency. The dam was built to store water from Bomo River. The Gembleng Dam is used for land irrigation with a service area of ±1735 Ha. During the dry season, The Gembleng irrigation often experiences drought and uneven water distribution. Therefore, optimization efforts using a dynamic program is used to optimize irrigation water so that it can increase yields. The results of this study are the water needed for irrigation every year is rice in rainy season 7,599 m3 / sec, rice in dry season I 7.93 m3 / sec, secondary corps in dry season II 5.35 m3 / sec for a possible year. The optimal cropping pattern is rice for rainy, rice and secondary corps for the first dry season, and secondary corps for the second dry season. The optimum land area that can be planted in a possible year is 849 ha of the dry season and 886 ha of secondary corps. For the normal year is 800 ha of rice and 935 ha of secondary corps. By using dynamic programming, the profit for enough years is Rp. 4,361,274,415.23 with increased of 23.28%.