I want to build a retaining curved garden wall. 27' long, hight to be 4'1/2' down to 1/2' high and have a square channel on top of it that carries the water from one end of the wall to the other.
If the wall was just one level - ie all 4'1/2 high that would be simple, but as it slops downwards and curves, I'm not sure what to build the wall from.
the options I can think of are:- Block work and render which I've never done before. I could make the shape of the wall from thin plywood and concrete in, I have done a simpler/small project like this. I could combine both options as I don't fancy mixing that much concrete as we have to move all products by hand to the back of the house.
for the top of the wall I was going to use 3 blocks of thermalite type bricks to form the channel shape and render/seal them with something like flexcrete.
Plumbing side, tank, drainage, water flow is all tested (used guttering) and working as expected.
Some constructive comments/advice would be great on how to move forward with the wall :)