The pond had almost totally silted up as it had been constructed with the flow of water entering from upstream (and hence bringing in all the silt). I dug it out last summer and created an upstream dam using the dug out silt. The pond now fills by backflow from the downstream end, which I hope will mean less silting up.
Across the downstream entrance I have planted Yellow Iris which have now grown up and I hope will provide a filter mechanism to further reduce the silt getting into the pond.
The water level is now regulated by a downstream dam and sluice.
I managed to identify the Marsh Marigold (Kingcup) roots as I was digging out, and replanted them (actually no planting needed - just divided the root balls and put them back into the dug out pond). This has been successful with a great display of yellow colour this spring.
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