In this study, the relationship among different economic sectors of Isfahan province (in the arid area of Central Iran) is investigated. The economic value of water from a river passing through the city of Isfahan (the Zayanderood River) is estimated from an aggregated input-output and linear programming model with fuzzy parameters that maximizes the province’s value added. The goals of the 4th development plan and other constraints are integrated into the model. The real value of a cubic meter of water in Isfahan is estimated to be more than 10,400 rials ($5.93 in constant 2001 prices). On this basis, the water from the Zayanderood accounts for about 13.55 percent of the province’s value added. The development plan will require at least 7.86 percent annual growth in investment. Water resource management and increasing investment are the two most important factors for decreasing production risk under the present economic structure of Isfahan province.

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