Warm cities: The city of Harburg should get greener

urban planning

Warm cities: The city of Harburg should get greener

Rainer Thermann (l.) And Christian Kadgien from the Harburg District Office’s Urban Green Department stand in front of a young tree with an artificial water reservoir.

Photo: Angelika Hillmer / HA

Harburg district wants to transform districts into model districts to adapt to increasing heat stress and heavy rainfall.

Harburg. That Schippsee district in the North Harburg city center it is at the center of an area destined to undergo significant transformations in the next decade. This is how the planners of the district office imagine it. It should be one quarters model be, which shows how densely built-up districts compare with consequences of climate change can arm. In addition, a feasibility study is underway on “converting a dense district into a climate-adapted district,” says Stephanrutschewski. The head of Department of Climate and Energy the implementation of the Harburg climate protection concept is entrusted to the town planning office.

Although the Schippsee district, as part of the northern city center, will undergo significant changes in the coming decades, in this central location between Karstadt and Buxtehuder Strasse, well served by the S-Bahn, it would not be a problem to “de-densify” but to disengage and close the green, emphasizes the head of the Harburg building, Hans Lied. “In terms of urban planning, we above all need to do better justice to two aspects of climate adaptation: warm nights and heavy rains,” says Lied. Both have already been incorporated into the current development plans.

So far, the planners’ goal has been to tackle the pouring rain

The environmental authority is currently testing high-resolution urban climate models that can be used to predict changes in the microclimate caused by construction works, assertarutschewski: “It simulates how heat, wind and heavy rain affect different building arrangements, tree planting and other factors. But the simulation software application is very complex. We won’t be able to do this for every construction project with our three positions in the Department of Climate and Energy. maximum in nerve points.

So far the focus, also in the Schippsee district, has been to face the pouring rain, saidrutschewski. Already in 2009, the environmental authority, together with Hamburg Wasser, started the RISA (Rain Infrastructure Adaptation) project to better combat potential water floods. The big goal is to keep as much rainfall in place as possible and not drain it through the locks. As part of the RISA project, for example, the “Biberland” rainwater playground on Fischbeker Holtweg and sustainable rainwater management in the new development areas Vogelkamp Neugraben and Fischbeker Heidbrook were created in the district in 2013. One of the three locations in Harburg’s climate department is dedicated solely to RISA business.

Lots of greenery in the city helps on hot days

If rainwater is collected during summer storms on unsealed areas, green roofs or in designated retention basins, it can gradually evaporate. And at the same time make a contribution to overcoming the second major climate problem in cities, the expected increase in hot days and tropical nights when the thermometer does not drop below 20 degrees. Because where the water evaporates, the air cools. This also applies during the day for water bodies such as the outer mill or the inner harbor. However, the effect is reversed at night, dicesuzziewski: “Water bodies store heat and release it again at night as hot water heaters.” The bottom line is that the blue and green bands are important elements of the city’s landscape program.

There are many design elements that provide relief on hot days, such as water features or shading elements such as awnings, stressesrutschewski. Above all, however, the climate expert and the construction manager are counting on the green in the city. It is important to preserve existing green spaces in urban centers and create equal replacement where they are occasionally sacrificed for new construction projects. Lied cites the farmer’s pasture project west of the Neugrabener Markt as an example: “A park will be created there to compensate.”

Green roofs store water and counteract heat

In view of the great task of housing construction, measures in which existing or emerging dense urban development is made green are at the fore in many places. On the roof plantation. Green roofs evaporate water, protect the top floors from solar heat and serve to protect species. The city subsidizes the greening of existing roofs up to 40 percent of the costs and also grants grants for green facades. Green roofs are gradually becoming the norm for new buildings. Song: “The requirement that roofs need to be greened is actually in every development plan.”

The new buildings in the city center are usually designed along the streets (perimeter development in blocks), in order to create a quiet internal courtyard in the center. “In the last few decades, very small blocks have emerged in many places. In favor of more greenery and greater flexibility of use, it makes more sense to design larger blocks, because this creates interior courtyards of adequate size with a pleasant microclimate, “says Lied. In such courtyards there is space even for trees.

More rows of trees along Buxtehuder Straße

In order to make life easier for the city trees in an enclosed environment, special water tanks were installed in the root areas for the first time when the Hölertwiete was made green in 2020 and received the Federal City Green Prize. The framework plan for the center of Harburg 2040 also contains many new trees: the B73 is designed as a multi-row boulevard, as well as new rows of trees on the Schloßmühlendamm. Song: “In the case of longitudinal parking strips, a tree has been planted every fourth parking lot. Today after every second parking lot, if parking spaces are provided”.

The building manager regrets that the trees on main roads often compete with the widening of cycle paths: “Especially when old trees get in the way, it is important to consider whether there should be separate cycle paths along the vehicle lanes that differ from the current standard at one point or another build, it can be deviated from “.

Updated: Wednesday 20/04/2022, 06:00

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