Pond Boss Forums Thread Like Summary - Question about new pond well looking thing

I just purchased a house, and I have a question about a spring/well looking thing attached to it. I couldn't figure out how to post pictures, so I linked to a question I asked on reddit with the pictures attached. I only got one answer, and a guy that works for me said to try out this forum. There is a well/spring looking thing attached to my pond (see link for pictures), there is a lot of debris at the bottom and it seems like there is no or minimal flow out of it to the pond. Do you think this is an old clogged spring, is that even a thing? There is definitely leakage out of the backside of the pond, you can see the water barely flowing out a tiny hole into a very wet marsh about 50x50 yds behind the pond. My main question is what do you think this is, or was. Thank you for your time, I can answer any questions if the explanation does not suffice.

Here is the link to the pictures https://www.reddit.com/r/ponds/comments/m4heah/question_about_pond_what_is_this_lots_of_debris/

Apologies if your not allowed to post links, I couldn't figure out how to upload the images.

Here's the pics for your post...

Attached Images

Thank you for all of your guys input. I will start by clearing out the debris in the bottom of the thing. My next project was to drain the whole pond and clean out all of the muck. One more thing while I got yall here. I was wondering about the water table because this pond is down the hill from the house I just bought. Next to my house is an old bucket well with alot of water at the bottom of it that never fluctuates. The "thing" in my pond is straight down the hill about 100 yds from my old stone bucket well. The elevation of water the level in bottom of my bucket well is probably 60' above the water level in my "pond thing". Maybe I need to do some more reading on water levels and tables but I would think that would make the water flow out of the "pond thing", I suppose I am assuming that they are connected in any way though.