1. Abstract
In the recent years with the defining of water footprint index that represents the total direct and
indirect use of water consumption in different parts of society, a new way has been opened to
research in modern management of water resources with an integrated approach. However, this
index cannot provide the information about irrigation management, deficit irrigation, over
irrigation and irrigation requirement during the crops growth process. So in order to have better
evaluate about the water consumption in agricultural part, it is necessary that the water footprint
index is combined and used other efficiently index in irrigation management topics. In this study,
the relative irrigation supply and water footprint indicators were used in order to assess the
condition of products in terms of irrigation and water consumption per product as well as providing
optimum cropping patterns to obtain maximize water for main cultivated crops in all provinces of
Iran. The water footprint of products was estimated In three components including, blue water
(WF blue), green water (WF green) and grey water footprint (WF grey), then for exerting irrigation
efficiency effects on calculating products water consumption, the actual blue water footprint (WFA
blue) was calculated. To calculate the water footprint, first the accuracy of the experimental model
of evapotranspiration in all stations were examined and after selected the best model was calculated
the long term trend of water footprint of products (40 years) and so was investigated the impact of
various factors and there changes in water footprint trend. So, the green, blue and grey water
footprint components, computed for each crops in all the studied stations, and by calculating the
RIS index, the status of crops yields per water consumption and agricultural current situation in
the studied aria was elaborated. To identify suitable areas for the cultivation, the geographic
information system software (GIS) was used to zonation the results of each crops. The results
showed that the mean water consumption of produced in three components including blue, green
and gray, was respectively 78%, 8.6% and 13.4%. The values of relative irrigation supply index
(RIS) showed over irrigation in most cultures except in limited cases. Finally with using of Topsis
multicriteria optimization method, the ranking of crops with regarding of utility was done in each
stations. In conclusion, some cops such as tobacco, cotton, beans, rice, sugar beet and alfalfa is not
recommended in water scarce regions and these crops is recommended only under certain
conditions and in specific geographic areas with the possibility of rain increases. Also the results
showed that with shifting of growth period (date cultivation or harvesting) can be reduce crops
water consumption and there blue and green water footprint.