Answer: You actually have a severe drainage problem, not a lawn problem! If you can correct the drainage, you should be able to grow healthy grass there. Now that you know where it collects and puddles, why not install a curtain drain to collect and disburse the water? It can be as simple as digging a trench, lining it with pea gravel, setting a perforated pipe on the gravel, filling in around the pipe with more gravel, then putting 4-6" of soil over the top. This will be a place for the water to go and be absorbed plus you can grow grass on top. I think it will solve the problem.
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