Approved culvert material shall be as follows:
(a) Reinforced concrete pipe, 12 inches in diameter or larger.
(b) Plastic polyethylene, polyvinyl, smooth interior, 12 inches in diameter or larger; or:
(1) ODOT 707.16
(2) AASHTO designation M294, Type S.
(c) Minimum recommended cover for driveway culverts:
(1) Rigid concrete, 12 inches.
(2) Smooth interior plastic, 12 inches.
(Res. R-02-004. Passed 2-4-02.)