"but I cannot prevent what is coming upstream into mine."

I don't know the lay of your land, or how much land you have up hill from the pond to your property line, but there might be a way of diversion.

For example, if you have a fair distance from the pond to the upside property line, you could build a diversion terrace to send the water around side your pond.

Living in an arid area, that is probably not the solution you want, because often times you want the water. But it might be possible to put a large culvert in the diversion terrace that would let normal flow into your pond. If you live on the property and saw a large rain event coming, close off the culvert with a door of sorts to bypass most of the rain runoff around the pond.

This suggestion is not meant to be a solution. Not being an engineer and not knowing your particular situation there is not any way I could come up with a good solution to your problem. I present it only as an "outside the box" thinking that might spur an idea of some possibility you had not thought of.

John

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