Guys, drill a bunch of 1/4 " holes in the first pipe you push in. When you get to the water the mud will look like rat turds coming out of the pipe. That's when you know to stop pushing.
I used to worry that all the pipes I saw in ponds had a vertical pipe on them. Then I wondered why. No one had an answer, just the way they always saw it. Think about it. It doesn't really matter to the water how it gets in the pipe.
Don't go swimming, ever, I can't even do that.
Gotta' have a transit to tell how deep the water is where you want to come out. Get a boat, don't try to hold a transit stick while swimming.
Go to the back side and find the same elevation, dig and level a hole, get a board, and start pushing with someone standing on the pipe. Remember, 7' lengths, any longer and they will bend. Galvinized pipe comes in 21' lengths, so that's where I get 7. We tried to push 10 and a half, but after a couple they bent. Have a valve ready and open, you can screw it on, and shut it, you will not lose 2 quarts of water.
E-mail is good if you need any advice. It sounds like a big deal, but really it's not to push a pipe in an existing pond. gs