久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

 
   
中文
 
Home> Local
Dam's flood capacity 'limited'
By Hu Yinan ( China Daily )
Updated: 2010-07-23

Dam's flood capacity 'limited'

Three Gorges project passed test but can't handle all flooding

The flood control capacity of the Three Gorges Dam, the world's largest hydropower project, is designed to be limited, a senior engineer said on Thursday amid mounting concerns over the project's ability to manage floods.

The multi-billion dollar dam was designed to withstand floods with water flow of 83,700 cubic meters per second, covering the Jingjiang River area and the Chenglingji region in Hubei and Hunan provinces, Zhao Yunfa, deputy director of the China Three Gorges Corp's cascade dispatch center, told China Daily.

"The dam's flood-control capacity is not unlimited as it has a capacity of 22.1 billion cu m and protects, by design, a limited area any flood with water flow exceeding 122,000 cu m per second would put the dam's own safety at risk," he said.

As China's main reservoir on the Yangtze River, the dam on Tuesday passed its first and largest test by sustaining a water flow greater than the flood of 1998, which killed 4,150 people across the country.

The flow of water into the dam's reservoir peaked at about 70,000 cu m per second. The dam, which was completed in 2008, discharged water at about 40,000 cu m per second.

Zhao's explanation came amid growing concern over the controversial dam, which officials hope would play a pillar role in flood control and clean power generation.

In the past few days, members of the public have been hotly debating online posts comparing four reports of the dam's flood-control capacity.

The first, released in June 2003, claimed that the dam "could fend off the worst flood in 10,000 years". The second, dated four years later, changed that number to "the worst flood in 1,000 years". In October 2008, the number was again modified to "the worst flood in 100 years."

On Tuesday, a report on State broadcaster China Central Television's website was titled "The Three Gorges Dam's capacity to store floodwater is limited". The story urged the public not to "lay all hopes on the dam".

In an exclusive interview with China Daily that same day, China Three Gorges Corp's chairman Cao Guangjing said he can "absolutely guarantee" that the dam is capable of withstanding "the worst flood in 100 years".

Cao, an engineer with the corporation since 1985, said the dam's flood-control facilities are "complete and need no adjustment".

Instead, the immediate focus of the work is on ways to improve weather forecasting ahead of the next major flood-control test, which will likely take place some time in August, he said.

Liu Ning, vice-minister of water resources, earlier praised the dam, which was completed in October 2008, as "instrumental" in China's flood control efforts.

Cao said the dam is able to do much more. "The peak flow this time was historical. But the frequency, peak period and volume of water were all comparatively limited - the worst in about 20 years. The dam is far from displaying its full potential," he said.

China had spent 181.5 billion yuan ($26.5 billion) on the dam project by the end of 2008. But critics claim that the project has caused, or will cause, consistent landslides and severe erosion downstream.

Cao, 46, dismissed the allegations as "nonsense". All these issues were addressed in preliminary feasibility studies from years ago, he said. The project began in the early 1990s and billions of yuan have been invested to preventing possible ecological disasters, he said.

"Extreme climate change and large natural trends are far beyond the control of the Three Gorges Dam project," Cao said.

The dam, which spans the Yangtze River, China's longest river, in Yichang city of Hubei province, has a capacity of more than 20 billion cu m and its water level can rise to 175 meters.

Its monitoring systems cover 60 percent of the upper reaches of the Yangtze, which incorporates an area of about 1 million square kilometers.

China Daily

Dam's flood capacity 'limited'

(China Daily 07/23/2010 page1)

 
Video
Specials



 
 
主站蜘蛛池模板: 国产精品成人网 | 国产高清在线精品 | 中文字幕乱码中文乱码51精品 | 日韩精品中文字幕一区三区 | 日本不卡免费高清一级视频 | 国产色视频在线观看免费 | 国产精品99久久99久久久看片 | 精品免费国产一区二区三区 | 国产欧美一区二区久久 | 作爱视频在线免费观看 | 免费观看a视频 | 深夜爽爽爽福利动态图 | 美国免费高清一级毛片 | 欧美亚洲国产成人不卡 | 日本三级一区二区三区 | aaaaaa级特色特黄的毛片 | 亚洲无总热门 | 国产性自拍 | 美女张开腿让我 | 中文字幕精品在线 | 99久久综合精品免费 | 亚洲第一视频在线观看 | 67194成人手机在线 | 国产高清专区 | 经典香港a毛片免费观看 | 精品成人网 | 亚洲品质自拍视频 | 在线播放性xxx欧美 在线播放亚洲视频 | 国产r67194吃奶视频 | 91欧美激情一区二区三区成人 | 99久久精品国产国产毛片 | 欧美成人短视频 | 性刺激久久久久久久久 | 免费男女乱淫真视频播放 | 女性无套免费网站在线看 | 女人被男人躁得好爽免费视频免费 | 日本在线观看www免费 | 一级毛片免费看 | 国产区在线免费观看 | 国产精品每日更新在线观看 | 黄色网址在线免费看 |