investigating the water accounting methods, introduction and implementation most efficient method

in last decade it is almost impossible to not seen anything about water resource crisis and water shortage in natural resources exploitation and use reports. such information encourages decision makers and researchers to looking for solutions in relation to this problem and sustainable management of water resources. in this regard, first step towards sustainable management of water resources is picturing status of existing management, in a way that, answers the questions about supply and consumption of difference water resources not only from engineering perspective, but also from economic perspective. in this regard, water accounting approaches with different methods was suggested and implemented by researchers. in this paper several types of water accounting methods will analyzed and compared from estimated quantitative indexes in final reports point of view. based on water accounting purposes in iran, system of environmental-economic accounting for water (seeaw) knew as most efficient system that will explain in last section of present paper.