Why doesn't it smell like sewers outside?

The sewer system is not airtight everywhere, but only inside your house, with the "siphon". But still, you only notice other smells…the restaurant across the street when the schnitzels are frying…then the brewery nearby when they're cooking their mash…You can smell the factory in the harbor, grain, coffee, etc. Car exhaust…You can smell the boss…

Do you know how the points are distributed in the IHK exam and how many you need to pass?

Hi, I took my written exam at the Chamber of Industry and Commerce the day before yesterday (Civil Engineering/Pipeline Construction). There were three parts: Economics/Social Studies (25 checkbox questions) Focus-related tasks (pipeline construction) (checkbox and tasks) Civil engineering (checkbox and tasks) Do you know how the points are distributed and how many you need to…

When is soil considered “contaminated soil”?

Let's assume you install drainpipes in your house that aren't connected to the sewer system, but are simply laid outside into the ground. And through these drainpipes, wastewater from the shower, sink, and washing machine constantly flows directly into the ground (into and "down" a slope). Is this soil then called "contaminated soil"? If so,…