University of Guilan Cereal Research 2252-0163 8 3 1970 01 01 Determination of irrigation water economic value using production function in paddy fields categorized with cluster analysis method in Sefidroud irrigation and drainage network Determination of irrigation water economic value using production function in paddy fields categorized with cluster analysis method in Sefidroud irrigation and drainage network 277 289 3392 10.22124/c.2018.8756.1350 FA Maryam Salar Ashayeri M. Sc. Student, Dept. of Water Engineering, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran Mohammadreza Khaledian Assoc. Prof., Dept. of Water Engineering, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran; Dept. of Water Engineering and Environmental Sciences, Caspian Sea Basin Research Institute, Rasht, Iran Mohammad Kavousi Kalashomi Assist. Prof., Dept of Agricultural Economy, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran Mojtaba Rezaei Research Assist. Prof., Rice Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran Journal Article 1970 01 01 There is a considerable gap between the amount of water supply and demand in Iran in all sectors, especially in the agricultural sector, as the most commonly water consumer sector. Economic valuation is used as a means for balancing the water supply and demand. In this study, in order to determine the economic value of irrigation water in Guilan province, first farms were divided into two groups based on homogeneity; then, using the production function and the analysis of five flexible and non-flexible functions, the best function was selected by statistical comparisons and finally, the economic value was calculated in each group. The economic value of irrigation water in the first group was calculated with transcendental function being 15218 Rials/m³ and in the second group the generalized Leontief function was calculated to be 17434 Rials/m³. Modifying the present tariff system and reducing the gap between the cost of water and paid water right by the farmers for decreasing water losses in paddy areas and increasing water productivity is an appropriate measure. Establishing local water markets in altering the attitudes of farmers to water is an effective public initiative and brings about the private feature of it. There is a considerable gap between the amount of water supply and demand in Iran in all sectors, especially in the agricultural sector, as the most commonly water consumer sector. Economic valuation is used as a means for balancing the water supply and demand. In this study, in order to determine the economic value of irrigation water in Guilan province, first farms were divided into two groups based on homogeneity; then, using the production function and the analysis of five flexible and non-flexible functions, the best function was selected by statistical comparisons and finally, the economic value was calculated in each group. The economic value of irrigation water in the first group was calculated with transcendental function being 15218 Rials/m³ and in the second group the generalized Leontief function was calculated to be 17434 Rials/m³. Modifying the present tariff system and reducing the gap between the cost of water and paid water right by the farmers for decreasing water losses in paddy areas and increasing water productivity is an appropriate measure. Establishing local water markets in altering the attitudes of farmers to water is an effective public initiative and brings about the private feature of it. https://cr.guilan.ac.ir/article_3392_0cf88db3aeb0aa2c01ba47218a04b6bf.pdf