Sewage treatment plants
Keep in mind:
The long term goal is to prevent all or as much as possible amphibians from reaching the sewage treatmant plants. The amphibians should be able to exit from the drains and shouldn’t reach the distant sewage treatment plants! In the pictures you can also see rain retention basins, where you can also find many amphibians. The rainwater retention basins are not always next to the sewage treatment plant.
Sewage treatment plant with an amphibian escape device
Sewage treatment plant without an amphibian escape device