My weeping tile discharges excess water from the basement foundation to my backyard. The yard slopes down near the last 4-5 feet of the pipe so it is only shallowly covered by the soil in that area. That area is also quite exposed to wind in the winter so it tends to freeze up the pipe if there is water present, not allowing the water to flow out. As a result, I have to rely on my sump pump to discharge excess water.
Is there anything I can do to prevent the pipe from freezing? Would rigid insulation help? If so, how much?
Most weepers work the same as your existing sump works. You seem to have a bonus, your back yard is working as a weeping bed, or french drain.
If I read your post correctly, the end of the pipe is not visible. If this is the case once the ground freezes, I expect further back than the 5ft mark, it can't absorb any more water. So the problem is the ground not the pipe.
For your ? rigid 2" or 5cm is roughly = to 130cm or 50" of ground cover.
An expensive option is to dig 1 ft down and cover the area with rigid.
I would stick to the sump pump.
Hope this helped.
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