LAC 51:XIV.707. Drainage Piping Installation

A. Horizontal Drainage Piping. Horizontal drainage piping shall be installed at a uniform slope but at slopes not less than permitted in §§707.B through 707.D of this code. B. Small Piping. Horizontal building drainage piping less than 3-inch diameter shall be installed with a fall of not less than 1/4 inch per foot (21 mm per meter). C. Large Piping. Horizontal building drains 3-inch diameter or larger shall be installed with a fall of not less than 1/8 inch per foot (10 mm per meter). D. Minimum Velocity. Where conditions do not permit building drains and sewers to be laid with a fall as great as that specified, then a lesser slope may be permitted provided the computed velocity will be not less than 2 fps (0.61 m/s).