I am currently looking into adding drainage to my yard. Not neccasarily next to my pool but upstream from it. I'm hoping to capture the water before it gets to the pool. I ended up lowering the pool water to about 6 inches of depth in the shallow end. This allowed me to pull some of the wrinkles out of the liner. It's not perfect, but it's significantly better. I then refilled the pool. Unfortunately, as the pool was refilling, I had some additional rain. This time the wrinkles returned, but not as badly as before. Using my pool brush, I basically swept the wrinkles to try and manage them. I pulled back the corner my liner and pumped out the water (I also did this when I initially drained the pool). This worked really well. Again, I still have some wrinkles but it's significantly better than before. I had a hard time getting the liner back in place and internationally left a little bit (3-4 inches in a corner) out of the track in case I need to pump again. I just sealed it with duct tape. I know its tacky but I want easy access until I get some drainage installed. It has rained twice since I pumped out the water. I haven't had the issue return yet. It hasn't been raining as much lately either.