As a part of this bilateral agreement, the Gandak Barrage, a part of Gandak Project, was built in 1968-69 over the Gandak river for providing irrigation to Nepal, Uttar Pradesh and Bihar.[15] The irrigation potential of this project is 11,510 km2 (4,440 sq mi), spread in the district of West Champaran, East Champaran, Muzaffarpur, Samastipur, Saran, Siwan and Gopalganj. The Eastern Gandak Canal Project was taken up in 1960 and Main Canal system was completed in 1975 for flow irrigation in Nepal for the gross commanded area estimated to be 103,500 acres (419 km2).[16]