Climate – Mainz – Cities: More green, less gravel – Knowledge

Mainz / Koblenz / Trier / Kaiserslautern / Ludwigshafen (dpa / lrs) – With a new green statue and design, Mainz wants to bring more plants to roofs, facades and gardens. “We’d like to say goodbye to ‘gravel gardens’ that many perceive as ugly, which lead to urban warming in the summer months,’ ‘we’d like to say goodbye to,'” said Marianne Grosse. (SPD), the head of the construction department, on Tuesday when the new guidelines were introduced.

The new statute will enter into force on October 1 and will apply to the entire city area and not just the city center. It has to do with new building projects. The old gardens have grandparents. But Grosse hopes that more of the greenery described for the new construction projects will also have a signaling effect and that one or the other front garden filled with gravel or crushed stone will disappear. Subsequent voluntary greening of existing buildings could be financially supported through the Mainz Foundation’s “roof and facade greening” funding program, said Janina Steinkrüger (Greens), head of the environment department.

In addition to banning gravel and crushed stone, the new statute stipulates, among other things, that at least one tree be planted for each 200-square-meter plot that has not been built. 15 percent of the construction plot should be planted with shrubs. Lawn mats or flat covers with wool or textile fabrics do not count as greenery.

In the future, one tree will be provided for two parking lots for vehicles and two trees for six parking lots. Flat roofs of 15 square meters should be widely greened. Facades with a continuous surface area of ​​20 square meters or more should also be greened.

According to Steinkrüger, a kind of modular system with possible alternatives and compensation of green spaces elsewhere should ensure that builders remain flexible. This means, for example, that if you want to cover half of a flat roof with a solar system, you need to plant more greenery in another part of the property, such as shrubs on the lawn. The head of the environment department spoke of a “colorful bouquet to make real estate greener”.

According to the city administration, compliance with regulations should be checked randomly. Indications of possible violations usually came from the neighborhood. In addition, builders will need to sign a “declaration of conformity” that they have complied with the rules. As a rule, however, disputes are resolved amicably.

– A look at other major cities in Rhineland-Palatinate:

According to the city of Koblenz, it is taking care of even more greenery in the fight against climate change. Numerous development plans contained regulations for green roofs or facades. Green roofs are financially supported as part of the “500 roofs program”. “In principle, it serves to minimize energy losses by insulating the roof skin or the top floor ceiling and thus reducing CO2 emissions,” explains city spokesman Thomas Knaak. Koblenz creates a green roof cadastre.

A climate protection concept envisions, among other things, planting trees in the city to limit their heating during the summer. Existing tree beds need to be upgraded to protect biodiversity and as insect pastures, preferably through sponsorship from locals.

According to the city administration, three climate protection managers in Trier are working on a protection concept with proposals for more greenery in the city. A special pilot project are soil moisture sensors, which measure humidity under trees – especially under young trees. With the data transmitted, irrigation should be more targeted than before. Citizens can also sponsor trees and beds. This includes watering new trees, loosening tree trunks, and reporting damage and hazards to beds.

Kaiserslautern city council approved a new green and open space design statute on Monday. It serves to prevent “malfunctions”, as announced by the Palatinat municipality administration. These include “gravel gardens” and artificial turf. These are no longer allowed. In addition, the plot design and landscape of Kaiserslautern city will be enhanced with greenery. The statute also aims to help promote biodiversity and support the implementation of the municipality’s concept of climate adaptation.

The city of Ludwigshafen emphasizes the importance of flat roof greenery. Based on climate ratios in residential, commercial and special areas, among others, this has been a common standard in development plans for many years, said the second largest city in the Rhineland-Palatinate. “In some cases, statutes were drafted to oppose the increasing sealing of front gardens,” a spokeswoman said. In addition, surface water tariffs can be reduced through greenery measures and roof stripping.

© dpa-infocom, dpa: 220502-99-129967 / 4

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