This may be a stupid question, but here goes anyway.

My pond, which has heavy spring-fed inflow and outflow, has a stand-pipe overflow where the water runs out of the top. I was down at the pond today and the water had stopped coming out of the top and the pond was about two feet higher than normal.

The stand-pipe intake was not blocked because I was able to open a valve at the bottom of the stand-pipe and the water flowed out.

There have been heavy rains recently. Is it possible that the water rises so fast that it will get higher than the top of the standpipe and some mysterious hydraulic law takes over and it stops running out the top?

Thanks for any insight.