I can breathe more easily now. What an absolutely beautiful day. The local weather site noted the high as 72 degrees. The school bulletin board (or whatever that big flashing sign that loops through temperature, time, and current events is called) had 79 degrees at 11:30. I spent a good part of the day just meandering around the pond and finally figured out the problem with the waterfall. If I had just started looking for a big, leaking hole at the top of the structure instead of at the bottom, I could have avoided all of the deconstruction and fill. Oh well. That bench, and the berm under it and the waterfall were distractingly ugly and needed to go anyway.