Backwater prevention or house lifting

Hello,

I am new here in the forum and hope that I found the right section. If not, I ask for your understanding and a moderator who can correct it.

It is about the following:
We are currently building a house and have now received the first draft from the architect for the building application. It is planned that the ground for our future house will be raised by about one meter. This is intended to ensure backflow protection for the drainage without the need for a technical device. According to the wastewater association, such a solution should also be pursued, which I agree with.

However, this means that the adjacent garage is about one meter lower and a small staircase must be installed.
Since we are building our house, on the ground floor, to be barrier-free, the staircase is an eyesore. We also lose a passageway between the house and the garage, which we had intended for garden work. Our plan was to be able to drive through there once with a van or excavator or something similar.

The alternative to raising the ground would be a technical backflow protection. As far as I have read, it also makes sense to use a lifting device with it. However, the whole system also requires electricity (which is probably negligible) and must be maintained.

My questions are now the following:

[*]Is the technical device useful?
[*]What can something like that cost? (I have seen something for €2500. Is that realistic?)
[*]What electricity costs do I need to calculate? (I have only found one concrete bill.)
[*]What are the maintenance costs and maintenance intervals?
[*]How reliable is the technical device?
[*]What happens in the event of a power failure?

Unfortunately, I don’t yet have a complete overview of the topic, so I hope you can help me here.

Unfortunately, I do not yet fully understand the topic, so I hope you can help me here.

We certainly can’t, thanks to your text without pictures and our otherwise still complete ignorance about you and your project we also do not fully understand.

It is planned that the ground for our future house will be raised by about one meter.

No sewage lifting station can cost as much as raising a plot of land by one meter.

Calculate closer to 5 kEUR for a proper lifting system

Whether this makes sense depends on your requirements, right? If you don't want to build up due to accessibility, then it will probably make sense. It's not some fancy modern thing, a pumping station. It's not always downhill in Germany.

Costs vary greatly depending on whether wastewater and/or rainwater is to be pumped, how large the roof area would be, the expected amount of precipitation during heavy rain for the region, installation location (indoor/outdoor), etc. way too many open questions.

Once you have clarified the questions above, you will also know which pumps you need. Single or double system (reliability), flow rates, etc. and how you protect yourself against power failure.

From this, you can then calculate the costs for electricity; pump characteristic curve with flow rate and consumption, precipitation amount and/or wastewater per capita per year, electricity price... should be doable.

In case of a power outage, it would of course, uh, be bad. There are alerts via SMS which are operated with a battery (remote alarm).

Hi.

I admit the information is probably too sparse after all. But I also have to say that I really have no idea which information is actually necessary for this.

It was more about a general statement regarding the dimensions people think of in this context. I just want to tell my architect "Yes, we build up." or "No, we solve this technically."

If you don’t want to build up because of accessibility, then that will probably make sense. It’s not some fancy modern thing, a pumping station. It’s not always downhill in Germany.

Thanks. That is already a statement I can work with. The technology itself is probably not a problem and not something to be afraid of, right? That’s what I hoped for.

I would still like a bit more information. So that I at least know what I’m getting into. Here is the plan I have for the drainage. The house would be a single-family home with 155 sqm for 4 people. If you need more information, please tell me which.

As I said, I don’t want a complete plan for this. I would trust the architect with that. I just want to know what I’m getting into.

I actually just want to tell my architect "Yes, we're filling up." or "No, we're solving this technically."

According to the drawing, I would say neither; and if you're cautious, maybe 20 to 30 cm, but not a whole meter. That costs a fortune, as hauling and spreading soil for an almost man-high (= still one meter high after compaction) fill is expensive. It’s not the smart alecks who pay for this, but you.