https://www.astm.org/news/box-sections-culverts-storm-drains-and-sewers-jf13
Box Sections for Culverts, Storm Drains and Sewers | ASTM
Since the late 1970s, precast box sections have become an important component in the construction of culverts, storm drains and sewers, but there has not been...
drains and sewersbox sectionsculvertsstormastm