If water is over the top of the stand pipe then the pipe should be full unless water is coming out of the exit end. Pics would help us understand the situation.

"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?"

That can happen and is why you have an emergency spillway. If your SP is running at full capacity and water inflow is faster than out flow water can rise over the top of the stand pipe.


Last edited by ewest; 02/24/08 04:53 PM.