pond and water table advice

Hi, my husband has taken out our garden pond as it wss situated at the bottom of our garden and prevented us from leveling our garden, anyway the previous owners created it to stay there for life as it was concreted and a foot thick all round, on removing the base we have water returning into the hole which I think we have hit the water table, not sure if we should leave some shingle to the bottom before filling in with soil, would this improve future drainage and prevent water loging or best to remove all debris?? Any advice would be great thanks

When my parents bought their farm, the whole area was in a high water table. Roads had to be built with cedar logs down first so the gravel or asphalt wouldn't sink. Basements weren't built because they'd fill in like swimming pools. But over the years the overall water table dropped dramatically, which wasn't good news for farmers who needed lots of water for cattle and horses.

If yours is a similar case then any low spot will always be soggy regardless what you do with it, so maybe a bog garden is the solution.