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City water hit by 1st salt tide of season
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A SALT tide has been affecting Shanghai for the first time this season, threatening water quality in the city’s waterways and reservoirs at the mouth of the Yangtze River, officials said yesterday.
The level of chloride density at the Chenhang Reservoir in Baoshan District early last week forced reservoirs to close intake pumps, the Shanghai Water Authority said.
“Some more severe salt tides are expected to hit the city over the coming winter,” said a water supply official surnamed Meng.
However, since the Qingcaosha Reservoir has come on tap, Shanghai is less vulnerable now.
The reservoir safeguards supplies from salt tides in winter and spring, as it can more easily be shut to prevent the salt at the Yangtze River mouth from getting in, a press officer with the bureau said.
Water storage of Qingcaosha is sufficient to sustain the city’s consumption needs for up to 68 days, while the Chenhang Reservoir can supply for 10 days, said the official.
Salt water pours into the Yangtze River mouth from October to April.
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