Can't take credit for that idea. Someone here did something similar around their spa. It was only 6 or 12" across, I think. It looked cool. They also explored some of the cleaning issues, if I recall.Dirk, I like the idea of keeping that area shallow and then there is a drop into pool area. The left side of the pool in my sketches would be shallow and the right side (by the kitchen) would be the deep end, so that might work since the seating area might be 2 feet deep or thereabouts, making it pretty safe even if someone jumped in. The seating area is on the side of the pool and not part of the main pool, so I can play with pool depth to match the depth of this seating area.
What is that circular thing to the side? Maybe a fountain of some sorts? Also is that a TV screen for projection on the far side of the pool?
The more I think about it, I think you are going to have challenges in the winter. In an abbreviated sense there are 2 ways to prep your pool for winter:
1. Winterize - This is typically done in northern states, but involves draining some of the water so that you can empty the pipes of water and cover the pool. Then the entire pool is covered.
2. Freeze protection - Typically done in southern states, but basically your pool remains operational through the winter. When it is going to freeze your automation has a temperature sensor and will run when the temps are close to freezing to keep water running through the pipes.
If you want to be able to use your sunken area in the winter, you would need a really customized cover. Alternatively, you can maybe have 2 separate bodies of water and close the pool area while keeping the moat operational. In TX, we fall into the Freeze Protection mode so there is no opening or closing of the pool and I'm not that familiar with #1 above. Hoping others will chime in that are more familiar with winterizing to see if there are any other options.
I would attempt to talk you out of floor drains (I got rid of mine and don't miss 'em), but that's an even longer post. Let me know if you're interested. Short version: they are old school and you don't need drains! Weird, right?