Installing new drain to stop flooding

I always thought I would have a problem with water running into the kitchen patio area, the levels between the old tiled floor and new where allways sketchy but difficult to measure with the tools on hand.

So I decided to slope the new floor to pool the water at one of the tile inserts by 6mm, using an old shower drain. just in case i cocked it up I planned to fit the drain after I laid the floor, and to my supersize it worked out.