Save rainwater in Berlin - conversion of Berlin to the sponge city would cost up to 10 billion euros

Regenwasser in Berlin speichern – Umbau Berlins zur Schwammstadt würde bis zu 10 Milliarden Euro kosten Damit Berlin nicht bald auf dem Trockenen sitzt, soll kostbares Regenwasser besser in der Stadt gehalten werden. Der klimagerechte Umbau der Stadt hat aber gerade erst begonnen. Das liegt auch an den gigantischen Kosten. Bei Neubauten ist seit 2018 die Regenwasser-Bewirtschaftung auf dem Grundstück vorgeschrieben – so wenig Wasser wie möglich soll also in die Kanalisation abgeführt werden. Fünf bis zehn Milliarden Euro würde es kosten, Berlin zu einer Metropole umzubauen, die das Wasser hält und wie ein Schwamm speichert. Der „Friedhof Georgen-Parochial II“ …
Save rainwater in Berlin - conversion of Berlin to the sponge town would cost up to 10 billion euros so that Berlin does not soon sitting on the dry, precious rainwater is to be kept better in the city. However, the city's climate -friendly conversion has just started. This is also due to the gigantic costs. In the case of new buildings, rainwater management has been mandatory on the property since 2018-so as little water as possible should be dissipated in the sewage system. It would cost five to ten billion euros to convert Berlin into a metropolis that holds the water and stores like a sponge. The "Georgen-Parochial II cemetery" ...
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Rainwater in Berlin Save - conversion of Berlin to the sponge city would cost up to 10 billion euros

So that Berlin does not sit on the dry, precious rainwater should be kept better in the city. However, the city's climate -friendly conversion has just started. This is also due to the gigantic costs.

For new buildings, rainwater management has been prescribed on the property since 2018-so as little water as possible should be dissipated into the sewage system. It would cost five to ten billion euros to convert Berlin into a metropolis that holds the water and stores like a sponge.

The "Georgen-Parochial II cemetery" in Berlin-Friedrichshain is a typical green oasis in the big city. But how many oases also fight with the consequences of climate change. The dryness is not good for the trees. Some had to be felled. And when it rains, so much water usually falls from the sky that it runs on the sloping cemetery site without being able to seep away.

The Cemetery Association of Stadtmitte no longer wanted to stand by this weather extreme. That was the starting signal for a project that could be exemplary for the whole city. With new plants, special gutters and a seepage area, the site was made at a climate determination last year. The heart of the project is an underground cistern. Rainwater is saved here with which flowers and trees are watered in dry phases.

Thanks to an unusual cooperation, this underground tank with a capacity of almost 200,000 liters has become significantly larger than originally planned. A newly built office building in the neighborhood leads the rainwater of its roof into the cemetery cistern and not to the sewage system.

Which sounds simple is legally new territory and financially not without. The cemetery association has received almost 500,000 euros from the country's funding program for its climate project for its climate project. The owner of the office building once again did a decent amount so that the underground giant bin including sophisticated control technology could be built.

an effective incentive for this offers the legal situation. The rainwater management has been required for new buildings since 2018. Large new construction projects such as currently in the Buckow fields were designed from the outset according to the sponge city principle. For future projects such as the Schumacher district on the former airport site in Tegel with several thousand apartments, local rainwater management is of course included.

Berlin is heavily sealed. More than a third of the area is concreted, paved or built on. Water that would be important for the plants and for the plants and for the enrichment of the groundwater, which would be important for long, hot dry phases, flows into the sewage system and thus directly or via the sewage treatment plants into the waters. For Berlin, the costable rainwater is always lost. So far, no politically responsible person has dared to change anything.

This reluctance can be explained primarily with the immense costs. The head of the water operations Christoph Donner recently ventured with an estimate: five to ten billion euros would cost to improve Berlin into a metropolis that holds the water and stores like a sponge.

A positive example that this conversion has already started in some places is the renovation of a top address. The Gendarmenmarkt not only gets a new pavement and technical infrastructure for events. The water operations also ensure that the space becomes permeable to water. In the future, over 5 million liters of rainwater can be seeped away via a so-called gutters-rigole system. Planning and construction of drainage cost around 4.2 million euros. This is about a fifth of the total cost of renovation and upgrading the Gendarmenmarkt. Money comes mainly from public funding - as with a significantly smaller dimensioned project in the Neuköllner Schillerkiez. The district has started to renew the damaged patch over a length of over 300 meters. The sidewalk is created so that the rainwater can flow into the enlarged tree slices and seep away there. The total cost of the measure is 375,000 euros.

How far private and public owners, on the other hand, progresses on their properties with the refrigeration and decentralized rainwater management can only be specified. According to its own statements, the rainwater agency carries out up to 300 consultations a year. The owners get very concrete numbers, which costs an investment in the sponge city.

The rainwater agency estimates that streets and places with space with five soccer fields are decoupled from the sewage system every year.

In the housing industry there is also awareness of how problematic the seal is. According to the survey of the Berlin Brandenburg housing company BBU, around 80 percent of companies that have participated in the survey have already implemented measures. These include green roofs, permeable surface coverings or faith greening.

The outlook, however, is sobering: "The Senate Department for Mobility, Transport, Climate Protection and the Environment assumes that essential investments will also be necessary after these programs in order to further implement the mission statement of the Schwammstadt." Anyone who should put these investments in the most climate -afforded metropolis remains open.

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Regenwasser in Berlin speichern – Umbau Berlins zur Schwammstadt würde bis zu 10 Milliarden Euro kosten Damit Berlin nicht bald auf dem Trockenen sitzt, soll kostbares Regenwasser besser in der Stadt gehalten werden. Der klimagerechte Umbau der Stadt hat aber gerade erst begonnen. Das liegt auch an den gigantischen Kosten. Bei Neubauten ist seit 2018 die Regenwasser-Bewirtschaftung auf dem Grundstück vorgeschrieben – so wenig Wasser wie möglich soll also in die Kanalisation abgeführt werden. Fünf bis zehn Milliarden Euro würde es kosten, Berlin zu einer Metropole umzubauen, die das Wasser hält und wie ein Schwamm speichert. Der „Friedhof Georgen-Parochial II“ …
Save rainwater in Berlin - conversion of Berlin to the sponge town would cost up to 10 billion euros so that Berlin does not soon sitting on the dry, precious rainwater is to be kept better in the city. However, the city's climate -friendly conversion has just started. This is also due to the gigantic costs. In the case of new buildings, rainwater management has been mandatory on the property since 2018-so as little water as possible should be dissipated in the sewage system. It would cost five to ten billion euros to convert Berlin into a metropolis that holds the water and stores like a sponge. The "Georgen-Parochial II cemetery" ...

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