Originally Posted By: Bronco Billy
Q- if there is no existing piping in place, as in my case, what are some methods to go about discharging water from the bottom of the pond yet still keeping the pond level stable?
Hey, I'm just a concept-guy in this case grin
Putting the concept into practice will test your ingenuity.
DISCLAIMER: I've never witnessed nor attempted this idea (crazy?); but I'm imagining something along the line of non-perforated flexible conduit for constructing the interior drain-pipe extention.
The highest elevation of the drain-pipe's lowest interior surface will dictate the pond's static level, except during heavy inflow-events.

If considering this project, keep the below image in mind (and Google any unfamiliar terms for their definitions).


EDIT: Hmmm. Just thought of something. DON'T extend the exterior section of the drain-pipe (as depicted in the above illustration). Doing so (in the absence of an air-vent at the drain-pipe's highest elevation) would potentially create a siphon-effect that could drain the pond until it dropped to an elevation that was even with the end of the discharge-pipe.