Irrigating hard-to-reach places such as the Österleden requires large resources. Until now, only one irrigation opportunity has involved at least two trucks, a tanker and a person staying in the middle strip for a long time. Traffic shutdowns usually account for the majority of the cost, but with the help of soil moisture sensors we not only give the trees better conditions to cope but also avoid expensive costs and a dangerous working environment.
The city's trees generate a great economic value but also a great value from well-being, design and environmental considerations. Therefore, it is important to take care of them in the best way and there are great financial gains to be made if we work smart. A tree that dies costs just over SEK 40,000 / pc to replace.
In connection with an area being exploited, new trees are often planted within the area. The developer then has warranty care on the trees for just over 2-3 years and when the city takes over the care, data from the sensors can give us a "receipt" that the trees have been cared for correctly during the entire warranty period.
For example, in 2019 we had costs of approximately SEK 300,000 for irrigating trees on Österleden. Of these costs, SEK 240,000 was only for traffic closures.
With the help of soil moisture sensors, it is possible to take care of the operation and maintenance of the trees in a better way, which can give the trees better conditions for coping. And we like trees!
At the beginning of May 2021, we have therefore gone from testing a dozen sensors to scaling up with 200 soil moisture sensors that will be located in particularly exposed places in our urban environment. In addition, we will know exactly when a tree should be watered by using, for example, weather data and sensor data.