This patio was hard troweled smooth. They were going to place some stones on top of  that curved wall as a bench.

I think strip drains should be used only where absolutely needed. In this case, it was thought it might look nice there

next to the hot tub, rather than sweeping the patio down along the edge to drain there off the side. There were a few

drainage options required for this one. As a result the slab is less flat and more contoured to enable the water to move.