Should this hole be draining quicker?

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I’m removing a pond. It’s got a couple of surprise layers of cement, total about 3 inches thick that’s holding water in so I thought I’d remove as much as I can.

thought I’d just remove enough to show soil below for water drainage when I fill it in to extend my lawn

I filled the bottom with water to see how it drains. but the bottom is not draining very well. I think it’s drained about 0.5cm in 30 minutes. It’s a lot of water, but in heavy storms am sure there’ll be just as much but then it’s mostly earth then so am worried the water won’t drain.

does anyone think that’s ok before I fill it in? See picture. Am worried I’ll have a water logged lawn if I fill it in without removing more concrete. It’s compacted clay soil maybe that’s it.
 

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The rest of the pond will need removing as the concrete walls are acting as a dam, the water should be able to run through the land
 
Thing is, where that water is, I have removed the concrete on the sides of it. Thats why I filled it up, to see how fast it drains sideways into the earth. but I dont think its draining, its still the same today.

So not sure what the issue is or what to do. The pond is quite long, so with new loose earth put in, and maybe a trench of stones down its middle to the edge of the garden, about 1ft deep, maybe surface water wont be a problem. I am going to have to try, I cant leave a big hole in my garden and cant see why it would not drain.
 
Clay does tend to hold water more.
 
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Make a feature of it? Fill it in and grow things that prefer a damper soil.
 
Make a feature of it? Fill it in and grow things that prefer a damper soil.
It’s actually in the middle of my lawn and I’d like my lawn back so no I don’t want to do that, but thanks though.

I’m just going to have to fill it in and see. Maybe it will drain closer to the surface and be ok.
 
So you've taken the sides out, what about the base? The concrete base still there?
 
So you've taken the sides out, what about the base? The concrete base still there?
Yes the base under water is there. I couldn’t remove it due to the water. I thought taking the sides out would allow the water to drain sideways and so the base would not matter so much. But it’s not draining at all. I think it’s just very compacted clay.
 

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