Ideal base to fill hole and turf over?

[308mate]

Ive got a bowl-shaped hole about 1.5m deep and 6m square, concreted at the bottom and up the sides, that used to be a fish pond.

We want to fill it in and put lawn across it. Ive decided to break up the concrete in the bottom a bit, to let water through to the ground - and then I assumed just chuck a load of hardcore in there, with some soil on top?

I dont want all the soil to wash through the hardcore, leaving the turf sitting on the rubble. Is this likely?

Anyone know what I should fill this hole with for the best result? And what proportions/depth of hardcore to soil?

ETA: Its actually 5m x 3.1m and average .5m deep. Measured it last night.

Edited by 308mate on Tuesday 20th April 10:35

Edited by 308mate on Friday 23 April 16:38

[308mate]

In view of the lack of replies, Ive decided just to fill with filling soil and a layer of top soil.

Im going to need about 9 tonnes of the stuff which the local soil supplier is going to charge me £285 for, delivered in grab bags - which I will need due to access restrictions.

Anyone got any other ideas on getting cheaper filling soil? Or an alternative method of filling the hole?

Edited by 308mate on Friday 23 April 16:53

[D14 AYS]

Sounds like you have it covered, fill it with soil and turf over proberly the cheapest way anyway, good luck

[andy43]

You might be able to get broken-up concrete for less per tonne than soil - plus there's quite a cost in the bags - a fiver each at our local place compared to loose-tipped material.
If you could get the material in there without a hi-ab you'd probably be able to get a builder to drop off a skip's worth of rubble for nothing.

[DanH]

Turf might not survive well if concrete near the surface anywhere. We have something like this in our garden and when conditions get dry etc the grass dies over it. Need to dig it out at some point. (n.b. ours is quite small and not massively deep)

[308mate]

The local soil supplier does a "Muck away" service.

He has said to me that next time his muck away truck clears 8 tonnes of half decent soil, he will drop it off to us for £60 quid. Its on a grab truck so they can dump it off over the fence using the grabber.

Im certain it wont be that straight-forward, but Ill try it anyway.