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City to improve drainage maintenance downtown

SHANGHAI will improve drainage maintenance throughout downtown ahead of World Expo 2010 to quicken draining speed.

Director of the Shanghai Drainage Administration Ma Yuandong made these remarks following yesterday's flooding that was caused by torrential rain.

Ma said the city's drainage network wasn't capable of handling the amount of water that flooded streets during yesterday's rainstorm.

The World Expo site in Pudong New Area recorded 129 millimeters of rain, the most in the city, as of 4pm yesterday.

Seven districts recorded more than 100mm of rain and more than 3,000 homes in Luwan, Huangpu, Zhabei and Jinshan districts were flooded with water up to 10 centimeters deep.

Water between 10 and 30 centimeters deep also flooded more than 70 roads across seven districts, according to Shanghai Flood Control Headquarters.

Most of Shanghai's drainage network was designed to handle rainfall of up to 36mm per hour, Ma said. The network in some areas including Lujiazui, the airports and railway stations could handle up to 50mm per hour.

To raise the draining capacity, the drainage network must be enlarged, Ma said. But he added that is unlikely because there is little space available underground as it is already overcrowded with various cables and wires.

Thus the alternative is to improve maintenance of the existing network to quicken the draining speed, Ma said.

He said Shanghai has successfully maintained its drainage network and in most areas floods can be drained within two hours.

Ma blamed garbage randomly discarded by some residents for clogging drainage pipes, which slows the draining speed.

Shanghai has invested more than 600 million yuan (US$87.82 million) to restructure its drainage network. The covered 51 roads and 61 kilometers of drainage pipes. By the end of this year, the network will cover the complete downtown area with a capacity to handle rainfall of 36mm per hour.


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