Backfilling - French Drain?

[Mulberry View]

I've successfully (though not without dramas) managed to get 1.0m (average) of Waterproof concrete into my ICF walls, this takes me just over the periscope vents in all areas of the building. These are at a variety of heights due to the differing ground levels around the building versus the internal floor levels (which also vary).

 

This photo is at the back of the build, where there is the largest deficit between the top of the foundation and finished external ground level. Now that I have concrete in the lower portion of the walls, can I consider some amount of backfilling? I'd like to be able to walk along here and in the not too distant future scaffolding will be needed.

 

 

This is at the highest part of the plot. I'm thinking Geodrain membrane onto the ICF, then backfill the trench with pea shingle, but is that enough? Do I need some sort of mechanism to prevent water from collecting on top of the foundation?

[Mr Punter]

Can you get a perforated pipe in there?  At the lowest part, could you have an outlet to surface water drain or soakaway?

[Mulberry View]

1 hour ago, Mr Punter said:

Can you get a perforated pipe in there?  At the lowest part, could you have an outlet to surface water drain or soakaway?

 

Yes and yes. I could just tee it in to a rainwater pipe below ground?