On the house side of my pool the decking from pool edge drops a couple of inches at the widest decking area, about 8' wide, then the decking coming from the house drops a bit to meet up with it. All of that slopes a bit to the edge of the decking.. They used the plastic strips with notches in them to help carry the water off. As long as I keep the plastic flushed out, once a year, a good deal of water goes out that way. When it is stopped up the water still drains away because where the two parts of decking meet is lower that both slabs. BTW.... the plastic stuff is 28 yrs old and still functional but if I don't flush it it fills with silt and grass grows in it. There is a drain a few feet away from edge of pool, about center of length of pool. It has been partially stopped up for years. It doesn't drain off heavy rain water very fast but will take off pool splash out and light rain. I've tried everything possible to get that drain cleared out, over the years, from both ends. Never been successful as I think some medium sizes rocks are wedged in a bend in the 3" pipe.
The only real bummer about the above mentioned sloping is that patio umbrellas will have a tilt in them which bothers DH and me. The only solution for that is an umbrellas base sunk into the concrete. An off set umbrella wouldn't show that as much but, in our case, there isn't enough room for one without blocking too much view from inside the house.
BTW... Our pool is pretty close to the house, 5' at the shortest distance. Pool long side is parallel to house. On the house side the slope away from pool and house, to the join, is much steeper than the other three sides that all go to plant beds or yard. I have a wood storage bench, with back and arms, up against the house in front of a big window. I have to put blocks on the down side for it to be level (You can see it out the big window so when it is not level it looks bad). Same for the gas grill, which isn't in front of window but it just looks better level. I use left over pieces of Trex for the "blocks". It won't rot and grips the bottoms of bench and grill and the concrete, so almost impossible for them to slide.
gg=alice