Analysis of water demand and water pollutant discharge using a regional input-output table: An application to the City of Chongqing, upstream of the Three Gorges Dam in China

China has faced serious water problems as a result of economic growth and some development projects and it is widely thought that integrated management, including socio-economic factors in each basin unit, is effective. Hence, the target of this paper is to evaluate the structures of water demand and water pollutant discharge with socio-economic activities in the City of Chongqing, the main city upstream of the Three Gorges Dam. First we have developed a methodology for estimating water demand and water pollutants (carbon, nitrogen and phosphorus) based on an inter-industry analysis model, and then applied it to the City of Chongqing. As a result, we conclude that industry is the largest source of water demand and water pollutants in the City of Chongqing and accounts for more than 50% of the total of each. Water demand from agriculture, forestry and livestock accounts for 35% of the total, and about 20% of water pollutants are discharged from agriculture, forestry and livestock. Furthermore, water pollutants from households constitute more than 20% of the total in the City of Chongqing though water demand and wastewater account for less than 15% of each total. In addition, it becomes clear that about 20% of the water demand and water pollutant discharge in the City of Chongqing is caused by other provinces and foreign countries, with most of the demand and discharge being industrial. (c) 2005 Elsevier B.V. All rights reserved.