Upgrade for creek flood defenses
Print Edition
SHANGHAI will begin building China’s largest deep-water drainage system this year beneath Suzhou Creek to improve the city’s flood defenses and improve water quality, Shanghai Vice Mayor Jiang Zhuoqing said yesterday.
About 15 kilometers of pipes will be buried under the creek to drain rainwater in a 58-square-kilometer area across downtown’s Changning, Putuo, Jing’an and Huangpu districts.
“It will provide the city with stronger flood protection,” Jiang told a local radio station. The system, which will be completed by 2020, will improve drainage capacity along the creek to 55 millimeters per hour from the current 36 millimeters, the Shanghai Water Authority said.
Through the pipeline, rainwater will be collected, purified and then discharged into the creek when it is not running high, said Bai Tinghui, director of the water authority.
During flood season, the system can store up to 740,000 cubic meters of rainwater to help keep the creek from running too high and flooding over, Bai said.
The water level in Suzhou Creek can easily exceed the alert level during the city’s flood season.
Currently, rainwater in the areas along the creek is drained through the wastewater pipes into local treatment plants. However, the rainwater has to be discharged into the creek directly when there is flooding and the pipes can no longer handle the volume.
The practice makes the creek vulnerable to flooding and pollutes the water, Bai said.
The pipeline will be connected to 25 existing downtown drainage stations along Suzhou Creek that collect rainwater.
The water authority will initially install a 1.6-kilometer-long pipe under the section of the creek in Changning District, Bai said.
Meanwhile, the city is launching the 40 billion-yuan Taihu Lake-Wusong River Flood Discharge Project, which will stretch about 120 kilometers between the lake and the river.
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