Pipe culvert design in AutoCAD

An example of designing a pipe culvert, with the GCULVERT program, an add-on for AutoCAD.
In addition to cast in place box culverts (see https://rumble.com/v3uwtc4-gculvert-cast-in-place-box-culvert-design.html), pipe culverts can now also be designed.
https://rcad.eu/gculvert/