Pond Boss Forums Thread Like Summary - Vertical Standpipe Riser & Horizontal Diameter

I have a ~1 acre pond with a vertical standpipe that determines the water level. The vertical section is about 7 feet and the horizontal run through my dam is about 30 feet.

I just had these pipes replaced since the corrugated metal pipe had rusted out. Both the vertical and horizontal section were replaced with 15" dual wall HDPE and there is a 90 degree elbow connecting the two. I recently learned that the horizontal section *should* have been a smaller diameter.

Is this a big deal? Is my pond doomed to flood the entire world? Would anything else help at this point (such as an anti-vortex plate)?

Thank you

Definitely put an anti vortex plate on it and I would also install a trash rack on the intake side to prevent something going down the stand pipe and getting wedged in there at the 90° elbow.

Anti-vortex plates keep air from being sucked into the whirlpool that develops without the plates. The air replaces water moving through the pipe thus reducing the volume of water the pipe will move per unit of time.