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 because he's bathed in perfume…
Is this simply because the wastewater is moving or do the gases sink to the bottom?
(1 votes)
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Because the air pressure is too high that does not allow the gases to rise upwards. Air, which is located directly on the ground, cannot rise because the layer above it is heavier. Therefore, the Gulli smells rather rarely in autumn and winter.
In the summer, this happens when it rains. When rainwater flows into the channels, it takes more space. The place where gases were before and accordingly they are pressed upwards.
Also in the gully is a odor trap.
I think there’s just a little smell coming out.
Imagine the waste water is running through a channel. They cover this channel with plates. A 10cm wide gap is left open all 50m. The smell is then easily recovered from the wind.
I’ve smelled more often from a gulli. Then you go on a little bit. I know the horse is sensitive to it. Dogs will definitely smell it. I don’t know if it’s an unpleasant smell for her.