An input-output analysis was applied to establish a
comprehensive database covering all of the Japanese goods and
services. The amount of water consumption in each sector was
estimated by modeling (for agricultural goods) and determined
based on the uses of input water according to the statistic reports
and hearing survey results (for other sectors). The intensities of
direct water input or consumption in each sector were calculated
by dividing the amount of water input or consumption with the
domestic production amount for each sector. Based on the inputoutput analysis by using Leontief’s inverse matrix, the intensities
of water use and consumption from cradle to gate were estimated
for all goods and services in 403 sectors of Japan.