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We noticed patio pavers near the foundation line started caving in, so of course I assumed a damaged drain tile system. I excavated and found the tiles seem sound, however were installed to far apart (almost and inch!) so the gravel got in, along with everything else! I am hoping that by just frequent cleaning (and repairing the exposed section) we can save the existing tile. BUT we don't have any clean-outs, so I will expose the sump pit as an access point. Got drawings from the city of the sump location, but they are 40 year old hand drawn sketches with no dimensions. I know the sump is off a certain corner of the house, but don't know how far. To help save my back, can anyone suggest the approximate location of a sump pit? 40 year old house, clay drain tiles, pit located on low side of property. Thank you!
 

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You need to empty the gravel out of the drain tiles and re-lay them with additional drain tiles as needed so the gravel does not fall back in. If the channel inside the drain tiles is not open then the system will not work properly.

YOu can try to find a drain specialist with an electronic snake that he can put down the drain tiles and trace its path from the surface with a hand held sensor.

What you probably have is a dry well for the drain pipes to empty into. Ideally a dry well should be some distance from the house and at a lower level (elevation).

In your diagram, are there two pipes or just one entering the "sump pit"?

It is possible for drain tiles to be around the outside of the foundation but with the sump in the basement. A connecting pipe goes under the foundation footins or through a gap between footing pieces.
 
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