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The Climate Adaptation Plan notes that Copenhageners should expect rising seas, up to 1 meter, over the next 100 years. Planners want to direct water away from roadways, cellars, and commercial buildings and toward places such as parking lots, sports fields, and parks where water will do little or no damage. The estimated investment for this method is 5 billion DKK ($868 million), and includes simple measures such as replacing concrete or tiles in a back yard or garden with grass and trees.ģ) Ensure that flooding takes place only where it does least damage: The plan concedes that water on the streets and in public squares will be more common if, as expected, rainfall increases in Copenhagen.
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For this reason, planners recommend method #2 below wherever feasible.Ģ) Manage rainwater locally instead of guiding it to sewers: The plan recommends that low-tech solutions that absorb rainwater locally, dubbed SUDS (Sustainable Urban Drainage System), will be adopted throughout the city.
#Cloudburst 2011 install#
The cost to install new drains throughout the city is estimated to be 10 to 15 billion DKK ($1.73 to $2.6 billion) and an additional 3 to 5 billion DKK ($521 million to $868 million) to separate rain and wastewater in individual dwellings. Credit: Justin GerdesĬopenhagen’s Climate Adaptation Plan describes three methods to be used to adapt to heavier rainfall:ġ) Larger sewers, underground basins, and pumping stations: The plan acknowledges that Copenhagen’s drainage network today is at capacity. Climate Adaptation Plan aiming to protect the city against storm surges and floods. “Today, the sewers meet this requirement to a large degree but they cannot meet a future increase in water of 30-40%.”īattered by downpours that caused intense flooding the past two summers, Copenhagen developed a.
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The City Council has decreed that infrastructure must limit floods to once every 10 years on average. “The heavy summer rain will create more extensive floods if nothing is done,” the authors write. Summer downpours will be 30% to 40% heavier and spaced further apart. Meteorologists expect precipitation will increase 25% to 55% in winter and decrease by 40% in summer in the coming years. The downpours that hammered Copenhagen in recent summers are likely to continue. An example of this recommendation in action are rules adopted by the city in May 2010 mandating that new flat-roofed buildings be outfitted with green roofs capable of blunting the impact of heavy rains. Going forward, the plan recommends that climate adaptation be incorporated into the designs of new buildings. The plan notes that just 1% of Copenhagen’s buildings are replaced each year. Included on this list are measures such as equipping cellars to cope with flooding and having pumps at the ready. 3) Reduce the city’s vulnerability: The lowest priority measures are those that reduce Copenhagen’s vulnerability to climate risks.