Great that he is sloping the pad, I always do that with features that I build. I always seal the base of a waterfeature with either waterproofing materials (thinset, Dec-O-Shield is a good one) or similar products. In this case if the feature should leak it will leak back into the pool. Heres to a good job well done.

Please refer to original post :-) This picture shows a top-down picture of the right pillar again showing the size of the pebble pool sunk in the ground bordered by the ferns. Image link:

Sometimes gardne centres have pump displays. Ours used to have a hozelock display with an outlet about the size of a brick. You could then press buttons to change the flow rate to decide which pump you needed. It was quite frightening what flowrate you got with alot of the pumps. Another way to go rather than the "freefall" might be to do something with a sheet or perspex just in front of the wall. A pierced hose with lots of holes could deliver a sheet of water to the top of the perspex. Again, playing around with a hose pipe is a good way to look at effects before you start. Another thought, to get a sheet of water, the brick needs to be perfectly flat. It will still have the tendency to converge so it won't be a sheet at the bottom. Using a finely corrugated former might help this. Do experiments with corrugated cardboard to see if I'm right. (ps this is from the person who has built a waterfall between 2 ponds but still not connected a pump!)

Before I answer, I have to tell you first, this is still Bill Vincent. Now that GW has changed over to houzz, it defaults to my houzz profile which is my company name, Creative Ceramic & Marble. Now, btnik-- to answer your question, I charge more on the floors, because it's a little tougher to keep the tile flush on the floor, thanks to gravity. On the walls, especially with a nonsag thinset, they pretty much stay where I put them. Only issue is making sure I shim them to keep the joints aligned, which is why I charge more for ALL wall installations than I do ALL floor installations. But in comparison to other floor installations, I will charge a little more for large format because of the buttering and scraping involved to keep the floor flat.