Water resources management of Qom Province by using the concept of water Footprint

Lake of adequate rainfall, lake of management and demand for water in arid and semi-arid regions such as Qom, management of water resources in the agricultural sector has been difficult. Always, agriculture is challenged as the largest consumer of water. The purpose of this study was to use the concept of water footprint and virtual water trading in (2004-2014) to reduce pressure on water resources and better management. Due, the low irrigation efficiency, the white water footprint was very high. Also, the blue water footprint calculated more than the green and gray water footprint. The white water footprint in cotton estimated 5267 m3/ton, that includes 48% of the total water footprint and the amount of blue water footprint in cotton calculated 46% of the total water footprint. After the cotton, watermelon has the highest amount of white water footprint that 64% of the total water footprint, and the amount of blue water footprint in this product is 32%. The amount of white water footprint in barely, wheat, hay, onion, tomato, melon and corn respectively, is 55%, 49%, 48%, 51%, 46%, 54% and 37/5% of the total water footprint.