During the period of rapid economic growth of Japan, which began in the mid 1950s, a large number of urban infrastructures were developed in Osaka to answer to the strong needs of its residents and industries. For example, 46 percent of the current major bridges (15 meters or longer), about 380 bridges, were built during the period between 1950 and 1970. These massively developed urban infrastructures supported the people’s lives, distribution of goods and economic activities, and contributed to population growth and economic development during the high-economic growth period. However, there was a very low awareness of proper infrastructural maintenance in both public and private sectors. At that time, if cracks were found, they were repaired; if a part gets too old, then they are replaced. There was action only after something happens. These urban infrastructures, in time, will get too old. According to our estimation, since these bridges will be 60 years old or older in 2030, 354 billion yen (4.6 billion US dollars) will be needed to renovate them within a span of 20 years between 2010 and 2030. For rivers, ports and harbors, if their renovation costs of 90 billion yen (1.2 billion dollars) are combined with the maintenance cost, a total of 840 billion yen (10.9 billion US dollars) will be needed. Especially for 2029 alone when the number of renovation works is expected to reach a peak, 170 billion yen (2.2 billion US dollars) will be necessary, which is about nine times the current cost of 20 billion yen (260 million US dollars). As population is declining, there is economic stagnation, and it is getting difficult to get tax revenues, it is highly probable that we will not be able to address these massive maintenance needs. Under these circumstances, it is vital and urgent for us to take steps to maintain urban infrastructure for a longer time, making it a safe and attractive thing for residents, and to further equalize the renewal investment for longer period of time.
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