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I assume that you don't have a water issue next to the house foundation.
I would look at the grade and install a french drain in the back yard and channel the water to a point where it is not an issue. This will probably require digging trench lines and getting the drainage slope right on your discharge lines.
The size of the piping depends on the amount of water involved. You could also use essentially a sump pump approach to physically pump the water from the low area of the yard.
Eventually you will probably raise the grade in that area. But be careful that you just don't move the problem (water) somewhere else on your property rather than fixing the problem.
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