ᐅ Cistern – Flat Tank or Cylindrical Tank – Groundwater

Dear forum community,

During our garden planning, we came across our soil report and the information regarding the water conditions. If we understand the report correctly, there is already groundwater at a depth of 1.9 m (6.2 ft)?
Does this mean that a standard plastic round tank could potentially float?
Am I interpreting the report correctly?

Thank you very much for your assessment.
Matthias_1212

Why use a cistern when the distance to the groundwater is so short? Why not just dig a well?!

A well is not worthwhile because the water quantities are rationed.

Why choose a plastic cistern instead of a concrete one? A concrete cistern should be heavy enough to prevent buoyancy. There will also be some soil on top pressing down. I just don’t know if it can withstand being permanently submerged in groundwater.

Because we want to install them ourselves, not made of concrete.

It’s not cost-effective. If concrete is used in the end, it also does a disservice to the environment.

Regarding the question: I don’t know how deep you plan to dig, but I don’t see any risk of floating. When it’s empty, the groundwater level is probably not that high. When it’s three-quarters full, it weighs about the same as the soil. And it’s only about the part below 1.9 meters (6 feet 3 inches) depth.