Cistern - Maximum Soil Cover?

Hello everyone,

I own the cistern Smart 6000. It is extended with a riser shaft. The riser shaft is between 39.5 and 61cm. How far it is extended, I do not know; I would have to open it once and check (?) – however one does that.

Now our plan for the outdoor facilities has changed so that we would need to raise it by about 90cm to 1m more.

Problem A: There is no such riser shaft from the company Nautilus. At most, the one mentioned above, which would get me up to a maximum of 61cm. If the current one is only 39.5cm, I would at least get 61cm + 61cm - 39.5 = 82.5cm, which might be workable.

Problem B: There is a filter installed somewhere in the cistern. With a riser shaft that is overall in the worst case 1.60m deep (wherever one would get that from), you would never be able to reach it again without diving equipment.

Problem C: The manufacturer’s description states that the cistern may only be extended a maximum of 77cm above the standard installed lid in order not to exceed the maximum earth covering. My soil is dry sand. I assume that it weighs less than loam, clay, etc. – is this still a problem and will the cistern be damaged?

Classic planning error that I made there. And now?

Follow the manufacturer's instructions. If you do not and something breaks, it is your own fault.

Now our plan for the outdoor facilities has changed in that we would have to raise it by about 90cm to 1m again.

In connection with what was supposed to be final 28 months ago ...

we are in the final stages of the floor plan planning with the and have had the house placed on the existing plot once. The house is to be built at street level – unfortunately, the plot immediately behind the street has a drop of about 1.5 meters downward and then slopes down by another meter over about 30 meters length. Accordingly, our house including the driveway and currently hangs in the air and we don’t really know how to incorporate this into a nice plot design.

... I am left with the modest question of how well the time in between was used to let something go seriously wrong :-(

If the planning has now changed like this, I would plan the cistern accordingly. A pump with floating intake has to go in there too, etc. Maybe a good moment to consider whether to use concrete right away. According to the manufacturer, a 77cm extension is okay, anything beyond that is your responsibility. In the worst case, you’ll eventually have a big hole in the garden – then the appropriate cistern must be installed, which otherwise would now be the alternative. In its new condition, it can surely be sold better than if it’s compressed like a broken submarine. How realistic that is, no one will tell you – calculate yourself and gamble away your risk aversion. Then consider if you can resell the obvious bad purchase, what the additional cost for the correct concept is, and whether the risk is worth it to you. If you buy a cistern in advance and only do the planning afterward, the risk aversion is quite manageable.

As far as I understand, the cistern is already installed. So it is a bigger effort. However, I would also adhere to the manufacturer's specifications.

As far as I understand, the cistern is already installed. So it is a bigger effort. But I would also follow the manufacturer's instructions

exactly, it is already installed. Selling, etc. is therefore not an option.