Many regulations across the U.S. and Canada limit gravity trench lengths to 100 feet. Is this length justified in science or practices? Let’s look at the possible reasons.
HistoryAccording to the Manual of Septic Tank Practices (1957/1967), “A soil absorption field consists of a field of 12-inch lengths of 4-inch agricultural drain tile, 2-to-3-foot lengths of vitrified clay sewer pipe, or perforated, nonmetallic pipe. In areas having unusual soil or water characteristics, local experience should be reviewed before selecting piping materials. The individual laterals preferably should not be over 100 feet long, and the trench bottom and tile distribution lines should
