Filling in pond

[Squeakers09]

Hi, we currently have a pond (7ft L X 5ft W X 4ft D), which we wish to fill in, then pave over with Concrete Flags on a sand/grit bed with sand jointing, which we want to put two sheds on top of.

I'm just wondering what is the best way to fill the hole, without the ground subsiding.

What layers/materials would we need and how deep?
What layers would want compacting?
How can we tell if the ground has compacted enough?
Would we need to leave the ground for an amount of time before paving?

We are looking at hiring a compactor from hire station
which one would be best for this job (if needed)?
https://www.hirestation.co.uk/tool-hi....paction

Thanks in advance.

[seanandruby]

I'd use a geo grid, then a good quality crush and run up to capping level. Place a good quality terran, start your formation with 150 dpt1, then your bedding layer and finally your slabs. Make sure you compact in layers as you progress.

[Dave_L]

Surely the initial fill could be with subsoil then the construction buildup?

[seanandruby]

Surely the initial fill could be with subsoil then the construction buildup?

Where and why would you buy sub soil ??? It is an old pond so think water, mud etc: I've used dry lean before.

[Dave_L]

OP could come and fetch as much as he likes from my yard!

[Tony McC]

It's a matter of how you compact the sub-soil. If you've a 20+ tonne machine to belt oit down with the bucket and then track over it repeatedly, then maybe, but with such a small (relatively speaking) area, it's more likely a plate compactor would be used, so better to build up in layers of, say, crusher run with geo-textile interleaves to minimise/eliminate any future settlement.