An Agreement between His Majesty’s Government of Nepal and the Government of India on the Gandak Irrigation and Power Project, signed at Kathmandu on 4 December 1959; which came in force upon signature (somewhat modified in 1964), to construct the project comprising a barrage, canal head regulators and other appurtenant works about 33 meters below the existing Triveni Canal Head Regulator and of taking out canal systems for purposes development of irrigation and power for Nepal and India.