From us to us: Merry Christmas to Us!
Using a toilet flange and spacer was a lot easier to get water tight (for me) than a pipe boot with a hose clamp on a 4" pipe. That said, it wasn't particularly easy for us either. I think if I was making recommendations to people who are building their first ponds, ummm ... connecting pipe under the sidewalk not exactly a cake walk. Oh, and do not let spouses talk you into doing one part one winter and the other part the next. Dealing with water in one side of the pond just made it all the more difficult.
Also, using the 4"x4"x36" strip cobble as a lintel over the drain pipe is working out really nice. I think I will have a lot less issues with settling. The ends of the lintel are sitting on concrete block that is rebar'ed and packed with sandy clay.
The extension is not as completed as I was hoping by Christmas, but it is close. I still need to seal the hose clamp on the top side of the pipe connection and make sure every thing is watertight before filling in the sand on top the pipe. Then I can close it up and get the liner in final place and plant some mondo grass along the sidewalk edge. And of course, we need more rock. Go figure.
The final pipe connection went like so: 4" sch 80 pipe .... 4" x 4" rubber connector ..... 4" toilet flange ..... liner ...... 4" toilet spacer. I think using the rubber connector will help a lot. Really wish I had used one on the other side. Of course, I didn't really know they existed then. The rubber connector will act like an expansion joint, it will allow a bit of flex to the liner. Also, I left a bit of extra liner above and below the joint. Since the pipe has been under the sidewalk for a year now, I really don't expect much more settling issues. And of course, we don't get ground freezes here in Central Florida.
I also need to finish up the filtration. Well, what is going to pass for filtration until we can buy a real pump! I have a 350 gph statuary pump being repurposed to help. It is tee'd to go to the green urn and to a the baby blue bowl. That blue bowl is the spot for a rock tower trickle. Just need to find the rock. Hopefully will find a nice specimen while we are down in the keys.
Provided we don't come home from the keys and find half the pond drained, I expect to finish up at the sidewalk connection area than let the pond run for a week or so. Then move the baby fish in and let that run for 2 weeks or so. If there continue to be no issues, then I'll take the cap off the pipe on the original side. And take bets on which of the old fish are the first through the pipe.
And find out just how much off my novice level measurements where, and adjust accordingly (as the two sides of the pond find their jointly natural level).
Then the next fun part of this project will be getting the pond water on each side to intermingle. I suspect there won't be a lot of natural exchange since we have a submerged 4" pipe. I suspect I'm going to need to be helping it along.