[pp.31-36]

Changes in Virtual Water Quantity: A DPG (Deviation from Proportional Growth) Model Application in Japan

Kumiko KONDO （Kyoto University）

Abstract:
Estimating the volume of virtual water in various products and activities has been seen as an effective tool for policy making, especially in water-deficit countries or regions. “Virtual Water” refers to the volume of water utilized in numerous manufacturing stages to produce a product. This empirical study attempts to apply a DPG (Deviation from Proportional Growth) method to an analysis of water resources among 15 major manufacturing sectors, using the Japanese regional input-output tables of 9 areas (Hokkaido, Tohoku, Kanto, Chubu, Kinki, Chugoku, Shikoku, Kyushu, Okinawa 1990-2000). The DPG method helps clarify important factors that have significant impacts on the quantity of virtual water in the regions and industries. The key factors are categorized into 7 effects: the final demand effect (within a region), export effect, outflow effect, input-output coefficient effect, import ratio effect, inflow ratio effect and water coefficient effect. According to the analysis results, the total volume of virtual water in 2000 was smaller than the predicted value; however, the total volume of water embedded in exported products in each region was greater than its predicted value, except for Hokkaido.

Key Word:
virtual water, DPG analysis, input-output analysis, water quantity, water footprint

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