While building a pond, I accidentally got some dirt at the bottom. If that were a fish tank, I would siphon it out, but the pond is lower than anything else around, so it is impossible to get the end of the siphon anywhere lower. Is there a way to still siphon out the dirt from the bottom of a pond?
I think your best option is to get a pond vacuum, it is a good investment for you to get rid of the soil in your pond.
A pond vacuum will save you a lot of work cleaning the bottom of your pond each year, so it is a long term investment.
Renting a pond vacuum is an option in some places, so you might take a look at what possibilities exist in your area for this.