Sacramento building codes require that all drainage systems have a minimum grade of ¼ inch per foot. This means that for every foot the drainage pipe travels, it drops in grade ¼ inch. A flat spot is a section of drain line that has no grade, up or down. A ‘belly’ in the line means that the line dips down and then back up before it resumes the proper grade downhill. The belly will hold water in the line at all times. Both situations can cause line stoppages. In a newer home, both are caused by improper piping installations. There
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