What's the underlying (sub-)soil like? If it's very clayey maybe your remanent pond just can't drain into it very quickly. Or maybe the drainage holes are blocked? Have you got a pair of hobnail wellies?
You could dig a small hole nearby and fill it with water and see how quickly that drains.
At least you have the reverse of the usual problem - "my pond's leaking, how do I stop it"!
I think that's it - with my clay soil, and the fact that the pond has been there for so long, the underlying soil is just smooth compacted clay. Any suggestions how I can loosen it up .... bearing in mind it's under 2 foot of muddy soil and a pond liner?!!!
I wonder if there's underlay underneath the liner? Maybe you haven't yet pierced that? Jab away with something sharp and see if that helps!
Funnily enough I'm having the opposite problem. I'd like to make ponds without the expense of butyl liners so I've been digging holes down to what seems a clayey subsoil and letting the rain fill them up in hope of an instant pond. Unfortunately they drain away over a few days once the rain lets up
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You could dig a small hole nearby and fill it with water and see how quickly that drains.
At least you have the reverse of the usual problem - "my pond's leaking, how do I stop it"!
Funnily enough I'm having the opposite problem. I'd like to make ponds without the expense of butyl liners so I've been digging holes down to what seems a clayey subsoil and letting the rain fill them up in hope of an instant pond. Unfortunately they drain away over a few days once the rain lets up
Pretty sure there ISN’T underlay!