Noting those issues Jimmy.The water feature is in and working, though some finishing touches are needed. The important thing for me is lessons learnt:
- I didn't fully appreciate water dynamics, and tried to imitate nature to much, the water course bed was to deep, and unless you have a really powerful flow from your pump water movement is quite slow, so shallower and a reasonable gradient to provide flow.
- I cut the excess liner at what I considered the right distance from the water level, the water wicks up the liner and leaks out, so the liner edge is not distance but height from the water's edge.
- Positive point, I did find reviewing YouTube videos landscaping expanding polyurethane foam that is good for ponds, and safe for fish (not that I have fish) and it seems to work.