Most of the liner I was able to hold in place by tucking it between blocks. This worked fine on horizontal places but I had one vertical rise which did not provide me the same convenience. I was not worried about anything in the actual workings of the waterfall. It was more of a visual aesthetics concern - I did not want to see the liner laying away from the wall. I remedied this by spraying some foam between the blocks and liner and held the liner in place with a clamped board.
After letting it sit most of the day I removed the clamps and board and found that it was staying where I wanted it (and, hopefully, will for a long time).
I will place some rocks against it which will also help to hold everything and will help hide the liner.
Next up was the fun and creative process of placing rocks. I started out by placing the rocks that will provide the 'step' for each fall (is 'step' the correct term?) and foam-gluing them in place. I placed foam both under and around the rocks. The foam that was "under" was to prevent water from going under the rocks. I quickly found that foam under the rocks would cause the rocks to rise and tilt. To help hold them down I placed heavier rocks and top and, for the most part, it helped. I did have some that will need to be redone.
After that foam had dried I removed my hold-down-rocks and did a test run of the water
I realized I had company who was curious as to what I thought I was doing...
He hung around for most of the day and, at some point, decided to go do something else. Meanwhile I started adding more rocks...
(The round rocks on the stack of flat rocks was, as before, to hold the flat ones in place while the foam set up.)
In this corner -
I want a place where I can set/remove plants in with little effort. My plan is to have some rocks under the water which will support this pot -
and, if done well, the pot will be almost invisible and I can simply drop in whatever plants I desire. Here is that pot set in place...
I will stabilize it and add some rocks around it making it a, more or less, permanent item.
How about a few more videos?