Re: My new pond takes shape.
#8
Berm!!!!!!!!!!!!!! please!!!!!!!!!!!!!! levee....... or how ever it is spelt, this is an UK board not an American, btw I am taking the mickey.
Re carpet etc I would suggest synthetic and it is probably more rot resistant but I have a word of warning over combination of depth and the contouring, I suspect that with the combination you are going to end up with some significant folds in the liner. Take you time filling the pond and work the folds as it fills, personally I would consider having some temporary water storage facility handy so that if you decide to shift the liner about you dont have to dump the water. The circular paddling pools with inflatable collars sold by the likes of B&Q make good and fairly cheap holding tanks. I took me a week to fiddle with my liner but my shape was worse than yours.
Re underlay, I used sheet polystyrene in my fishpond but that is inside a concrete shell. I used sand on the wildlife pond and the plant pond, it can be used, damp, to line sloping walls but vertical walls would be a bit much.
Polystyrene is a BAD idea for floors on which you will want to walk, it crushes under the concentrated load generated by feet and takes a set, sand feels hard when there is a good depth of water above it but it still has some give.
If you use sand on floors walk it in bare feet, you'll soon find the sharp points you missed, likewise if you try damp sand on walls use bare hands to pat it into place.
If you use carpet make sure it's tack free!