These culvert forms can be any size. The one shown has a diameter of 125 cm (7 ft) and a length of 8 meters (26 ft). Monolithic culvert forms are designed and built to last for centuries. They can be reinforced with basalt rebar that will never rust.

These culvert forms can be any size. The one shown has a diameter of 125 cm (7 ft) and a length of 8 meters (26 ft). Monolithic culvert forms are designed and built to last for centuries. They can be reinforced with basalt rebar that will never rust. (Don Garrison)