The complex drainage system in Hong Kong protects from once-disastrous flooding caused by seasonal typhoons. But will it be strong enough to withstand the effects of the climate crisis?
, the alerts warn people when to avoid unnecessary travel due to the danger of road accidents, or even landslides caused by rain in some mountainous parts of the city.
Since 1995, the department has spent around $3.8 billion on various projects. That has included installing 2,400 kilometers of drains, 360 kilometers of river channels, four vast underground tunnels spanning 21 kilometers , and four stormwater storage tanks. Another 11 tanks are being constructed. Richard Leung, the DSD's senior engineer, won't be drawn on whether all this has been value for money, but for context, flooding in southern China led to economic losses of more than $2.9 billion One of the largest storage tanks in Hong Kong lies beneath one of its best-known landmarks: the Happy Valley Racecourse, where, before coronavirus, tens of thousands of gamblers bet on weekly horse races.
Happy Valley is also indicative of the DSD's future plans to recycle rainwater citywide. Some of the water that falls on the racecourse is collected and reused, for irrigation and to flush toilets in nearby housing estates.Joshua Berlinger, CNNThe achievement of Hong Kong's anti-flood strategy cannot be overstated.
,"rain from tropical cyclones will increase ... and sea levels will continue to rise, increasing the threat of storm surges and coastal inundations," due to global warming.Edward Ng, professor of architecture at the Chinese University of Hong Kong, said that some work had been done to bolster Hong Kong defenses, but that"hundreds of millions of dollars" are needed to properly defend the coast.
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