ᐅ Rainwater Cistern: Useful? Necessary? Costs?

That sounds like a solution (who does it, what it is called (and whether it needs approval), and approximately how much it will cost. Today, in the new development area, two builders were very eager to talk about this. Both reported major issues with making changes to the original building application after the fact. I don’t know why the construction company chose a trench drain as the infiltration method. I will ask when I decide to include the "rainwater infiltration chamber" for drainage...

Swales are installed by the municipality between the property and the street. They collect rainwater from the surrounding surfaces. The swales are then seeded with grass.

The rainwater infiltration shaft is only intended to capture rainwater from the roof.
I think a pump could be installed there later on...
I believe two neighbors have alternatives with large stone-filled swales located under the terrace or elsewhere. These also collect rainwater from the roof and allow it to infiltrate.

What is the point of having a pump in a soakaway pit? The water has to be pumped somewhere, right? If it’s pumped into the regular sewer system, then an overflow protection would be enough (and in that case: why even bother with infiltration?). If it’s only pumped upwards, then it just circulates and comes back again.

The homeowners definitely confused me with this topic. Both mentioned that they should lower about 15% of their plot by 30cm (12 inches). But that doesn’t make sense. I would use the edge, and the water would run to the neighbor. That can’t be the intention...

And now, somehow, both have gotten approval for a pit as well.

On our property, rainwater must be infiltrated on-site, which is managed through a soakaway system. According to the architect and civil engineer, adding a rainwater tank as well is not worthwhile because the soakaway is still necessary, and you won't collect a significant amount of usable water anyway. They recommended that it would be better to invest half the cost in drilling a well instead.

@nathi, what was the expected cost for the cistern? Did you get a specific quote for the well drilling (cost)?

@Bieber0815 Unfortunately, I don’t have any specific figures. We will take care of the well only after we have moved in. We simply trusted the professionals and didn’t follow up much afterwards.
The cost of the cistern depends a lot on its size, while the cost of the well depends on how deep it needs to be drilled. So, it can vary quite a bit.