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Mark I had a french drain in my old house, perimeter of the foundation was sawn and crushed stone with perf pipe was installed and plumbed to the sump pumps. Looking at your patio it has a negative grade towards the house, I'd start there. Your piping needs to be well below the frost line or you will have problems. I would perimeter drain the back at the bottom of the foundation and drain it into a drywell on each side then re-do the patio with a 1/2 in 12 slope minimum. Let the ground do the work for you.
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