Liner Floating - Please Help!

As someone who has had to do a few drainage projects since the install of the pool, I can say for certain that the dewatering line and a sump pump will help. I have no experience with a sump pit, but a dewatering line and a sump pump will help. Are there no square/round covers on the pool deck that look like they don't connect to the pool? Maybe you already have one?

What will also help is diverting incoming water to your property and diverting water that arrives otherwise away from your pool deck and foundation. That is as easy as putting french drains in correctly in the correct places. The picture where you show the corner of the brick near the end of the white channel drain is one place I would start, as well as running something from the corner where the swingset is down the fence line and out to the front yard into a sump or simply a pop up, depending on your local codes. That corner slopes down, from the look of the fence line, and towards the middle of the yard and the edge of the pool deck. I wouldn't be surprised if the channel drain was installed to keep puddled water from encroaching under the porch. The problem is, they didn't finish the job. It just ends at the corner open to the ground.

French drains are easy to install. You may want more professional advice as to the proper placement and where the water should/can go, but I think they will help. That is a lot of standing water right on your foundation past that channel drain. I would also at least try to enclose that last bit of channel drain, maybe into some closed pvc pipe and then run it into a basin and then into either a closed pipe or a french drain along that wall. . I can't comment on water coming opposite the camera angle from photo that shows the swing set or how your yard slopes there -if you are getting water from that direction as well - but a french drain along that wall sloped out to the front would help.

I just finished 2 channel drains and a french drain along our shed which is on a slab near the pool, catching water from grass near the pool and water from the neighbor's property, which is higher than ours now post pool construction. With storms as they are, I have yet another project to try and figure out where to put gutter water since these storms are putting out more than the 4" pipe I put in can take. That's another thing you can look at, gutters if you don't have them, and if you do, where is your gutter water going.
 
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