Subantoro irrigation area which located at the province of Jawa Timur expands as much as 515 Ha. That large area is divided into two sections in which located in Kabupaten Mojokerto and Kota Mojokerto by 416 Ha and 99 Ha of area respectively. The water is supplied from Kintelan River through Subantoro dam. There are 3 secondary channel with 9.298 metres of total length consisting of Subantoro, Kedung Pring, and Ngrayung. Currently, There are lots of damage in the channel system and other diversion structure hence quite amount of water losses occurred. Budget limitation was suspected to be the cause of incomplete maintenance.
Keywords : Maintenance, Water Loss, Mixed Integer Program.