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Kranzberg municipality decides to use underground rain retention for the western ring road

2021-10-26T13:07:36.009Z


The construction area in the western ring road in Kranzberg is developed with a trench. The underground plastic container has space for around 200 cubic meters of water.


The construction area in the western ring road in Kranzberg is developed with a trench.

The underground plastic container has space for around 200 cubic meters of water.

Kranzberg

- The underground rain retention serves to dampen peaks in the event of future heavy rain events.

The development work on the construction area is scheduled for spring to autumn 2022, and that is why the municipal council now had to make the final decision on such a trench.

Representatives of the Wipfler Plan office technically explained how the almost maintenance-free system works around 2.50 meters below the site.

The hydraulic calculations showed that there should be no flooding during a 20-year rain event with or without a trench.

With the buffer area, however, the water would be directed more throttled into the canal towards Amper on extreme rainy days.

This then also offers additional protection for the "lower lying" in the area of ​​Untere Hauptstrasse.

Some municipal councils also see the water buffer as an important measure, because the building area on the western ring road with a net building area of ​​over 12,000 square meters could be followed by further designations of building areas in the coming years.

The planners made it clear that underground water retention does not mean a loss of space on the surface.

Above that, a green area or a playground can be created.

(By the way: Everything from the region is now also available in our regular Freising newsletter.)

Reinhard Bauer and Markus Goldbrunner from the Wipfler Plan office showed that a classic rainwater retention basin would require significantly more space. With a construction cost of 40,000 euros, this would be significantly cheaper, but it would also eliminate a building plot for a semi-detached house in addition to a public playground. Even if there were a few critical voices at the beginning about the sense of an underground water buffer, in the end, with the unanimous decision, the development planning including the trench was left unchanged. "We take away the first 30 liters of rainwater per square meter," said Franz Braun, "and it is also clear that heavy rain events will increase in the future." Roland Haslbeck agreed with him that the question of need did not arise.Braun wanted an alternative version of the underground system, where instead of several plastic containers, a concrete area would be built. This variant will probably cost a few euros more when the development is finally awarded.

Source: merkur

All news articles on 2021-10-26

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