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Sewer lines that are too steep will allow water to outrun the solids. Solids left in the sanitary line will create a buildup of noxious gases as the material decays in the line (anaerobic or 'septic' condition) rather than at a treatment plant. It may lead to a partial or complete blockage of the sewer line if the liquids do not have enough sustained volume or pressure to dislodge the solids - leaving more solids to build up. The most likely problem is the buildup of sewage gases. 1-3% downgrade is ideal.

One area where debris usually builds up on steep grades is at joints of pipe - especially the old clay lines which join every 4'. Another area with a common build up of debris is where a steep grade levels out.

How do I know? I work in public works department and run ccd cameras down blocked residential sanitary lines.

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Q: What can happen if the 'fall' for a sewer line is too grate?
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