PUBLIC WORKS BUREAU > Introducing our Projects > Water-retentive pavement
Osaka City Home Site Map Japanese
An outline of the Public Works Bureau The Work of the Public Works Bureau Introducing our Projects Recycling Operations
Ferries Bicycles Public parking lots Toll road (toll bridge)

Introducing our Projects
Burying electrical cables Developing multipurpose underground conduits Water-retentive pavement Development projects along the edge of the Dotonbori River
Hirano River Flood Control Reservoir JR Hanwa Line grade separation project Sewerage system improvement    

Water-retentive pavement
In 1998, Osaka City became the first municipality in the country to apply water-retentive pavement technology to roads as part of measures to deal with the heat island phenomenon.
Water-retentive pavement is designed to facilitate the storage of rainwater by forming gaps at frequent intervals in asphalt-based pavement and embedding water-retentive material for water storage in these gaps. This enables the storage of 3-5 liters of water per square meter of pavement. As this water evaporates into the air, it absorbs the surrounding heat and lowers the surface temperature by about ten degrees Celsius relative to conventional asphalt. Preventing surface temperatures from getting too hot is the way in which this innovative new type of pavement helps to diminish the heat island phenomenon and moderate the heat felt by roadside residents.
Public Works Bureau Top Page / Up