How deep can an attenuation or soakaway tank be?

Posted by Luke Quentel, on July 10, 2024.

It very much depends on the crate type. We have a rain block crate, which is a traditional one-piece crate, which can go as far as 7 meters underground, but it will depend on the soil type essentially. Heavier clay soils have more of a lateral loading and more loading on the tank, and so couldn’t go as deep. But in perfect conditions, a rain bloc crate can go as far as 7 meters underground. Graf EcoBloc Maxx, a maximum of 5 meters for the soils that we deal with.

But again, quite often the actual loading, where we put in the figures and the cover labels and everything, it’s more like somewhere between 1.5 – 2.5. It is very site specific. But the absolute maximum, I would say, for an EcoBloc range is about 5 meters underground. But often the surrounding conditions won’t support that. Again, we have to do calculations for every site, which we will do, but that is your maximum labels.


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