I wanted to get some other opinions on this issue.
Background: Home was built in 2019, and is located in Michigan (so frequent freezing temps), the home is located on a canal and was a custom build.
Issue: the sump pump discharges from the crawl space into the canal to the rear of the yard. At the time of install back in March 2019 the discharge was about 6" above the water line. According to homeowner in June the water level rose above the discharge in the canal. The builder’s solution was to add an elbow to the discharge bringing the level just above the water.
As expected, when I inspected the discharge pipe, it was full of water as it has no way to drain. with the entire line being only 18-20" below ground, I cannot imagine how this pipe will not freeze solid, initially forcing water out of the overflow near the house, and then ultimately having the overflow freeze.
What is the acceptable remedy for a sump discharge that now discharges under water? it would also seem that a failure of the back-flow preventer could even end up creating a siphon from the canal to the crawlspace. I attached a simple sketch of what is going on. Please let me know what you think!
Sumpincanal.pdf (104.9 KB)