My neighbor and I have discovered that when our houses were constructed, the builder constructed the storm sewer drain with 3" HDPE pipe. Both of our sump pumps and 6 rain gutter drains are feeding into it. The pipe is collapsing in a few places and we need to replace it. We are considering going to a 4" shared pipe, but the contracter didn't recommend it. Even though my neighbor and I are cool about sharing the costs of a shared pipe, the future house owners may not. Are there any other issues that we may not be considering?
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