Thanks for your input. The 'pond' is in a farmer's field and he has no intention of digging ditches to help us as it doesn't bother him. We haven't tried sandbags but there is a wall which the water somehow seeps under! as well as over in a couple of places when the rain is really bad. We have a moat our side which overflowed last weekend but it does hold a lot as it is pretty deep. We did have a very big pond when we moved in and we were advised to get rid of it and replace it with drainage stone which we did. That did help a lot as it was over a much bigger area.
You clearly need expert advice but in the meantime, can you make your moat deeper? We have a similar, but not so severe situation: a small stream takes the water from a pond fed by underground springs and rainfall on very heavy clay. In the past, water ran straight downhill through the garden, but a previous owner dug out a channel, taking it across the top of the garden and out into what was a field but is now housing. When the houses were built, a culvert had to be constructed. Obviously, you need a drop in level but ours is very slight. The stream is wide enough to contain the water in very wet times and the clay holds enough to prevent flooding. The garden IS very waterlogged at times, but never flooded.
Thanks for the advise. Not sure about making it even deeper and to be fair it normally holds the deluge back. It's getting rid of all the excess water on a flat plot that we are struggling with.
This time the moat has added to the flood but it comes from the field behind us, the guttering and even the overflowing numerous water butts. The rain just has nowhere to go through clay soil except for soakaways that get waterlogged.
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