What it is
A belly is a section of line that has lost its fall and now sits lower than the pipe either side of it. Water collects there instead of draining away.
Why it causes trouble
Standing water slows everything passing through and gives solids somewhere to settle. The result is a line that catches waste in the same place repeatedly.
Why cleaning does not fix it
This is one of the few drain problems that cleaning genuinely cannot resolve. You can clear a belly out, and it will fill again, because the shape of the pipe has not changed.
How they happen here
Ground settling under a line laid in fill is the common cause locally, particularly in the newer subdivisions built on former farmland. Poor bedding at installation is the other.
How we measure one
The camera records distance as it travels, so a belly comes with a location and an approximate length. That matters because a short sag near the house is a different job from a long one under a driveway.
Living with a shallow belly
Not every belly requires correction. A shallow one in an otherwise sound line can often be managed with periodic cleaning, and for many homeowners that is the sensible economic choice. It should be a decision made with the footage in front of you.
How it gets misdiagnosed
Standing water in a camera image can also be a camera resting at an angle, or a short dip that drains fine in normal use. A confident diagnosis of a belly from a still image alone is worth questioning.
What correcting one involves
Getting to the affected section and restoring the grade, which normally means excavation of that portion. It is a targeted job rather than a full replacement, and the length involved drives most of the cost.
