We had a check valve installed on the main sewer line near the plumbing stack to prevent sewer backup. A large open hole was drilled in the concrete basement floor and the check valve was installed and a wooden plank was put on top......and it works. However, during heavy rains the rising water table permeates the check valve pit and eventually rises and floods the basement. We can't install a sump pump because distance above the check valve is too narrow. We have a utility pump for emergencies but need a better solution. Since we already have three sump pumps in the basement, I thought of cementing a large PVC pipe to line the concrete hole and having it rise two or more inches above the basement floor. Then when the water table rises, the three other basement sump pumps will continue to work and the "open" check valve area will not flood the basement. Will this work or should we try another fix? Thanks
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main sewer line check valve water table leakage