12 Va. Admin. Code § 5-610-740
The minimum slope for three- and four-inch sewers is 1-1/4 inches per 10 feet, and for a six-inch sewer is 3/4 inch per 10 feet.
§§ 32.1-12 and 32.1-164 of the Code of Virginia.
Derived from VR355-34-02 § 4.9, eff. February 5, 1986; amended, Virginia Register Volume 4, Issue 14, eff. May 11, 1988; Volume 16, Issue 16, eff. July 1, 2000.