Pakistan depends almost entirely on the flows of Indus System for surface water supplies for its requirements of irrigated agriculture. The Indus System consists of the main Indus and its eastern tributaries Jehlum, Chenab, Ravi, Beas and Sutlaj and north western tributaries, Kabul, Swat, Haro and Soan. Of these, the three eastern rivers, namely Ravi, Beas and Sutlaj have been exclusively assigned to India under the provisions of the Indus water Treaty, 1960. Also, under the Treaty, India has been allowed to develop 1,343,477 acres of irrigated cropped area on the western rivers, without any restriction on the quantum of water to be utilized.