This specification covers single-cell precast conventionally reinforced concrete three-sided structures intended to be used for the construction of culverts and for the conveyance of storm water. Precast reinforced concrete three-sided structures manufactured in accordance with this specification shall be designated by span, rise, and design earth cover. The reinforced concrete shall consist of cementitious materials, mineral aggregates and water, in which steel has been embedded in such a manner that the steel and concrete act together. The three-sided section's dimensions and reinforcement details shall be as required by design. Splices in the circumferential reinforcement shall be made by lapping. The precast reinforced concrete three-sided structures shall be produced with tongue and groove ends, flat butt ends or key-way ends. The aggregates shall be sized, graded, proportioned, and mixed with such proportions of cementitious materials and water as will produce a homogeneous concrete mixture of such quality that each section will conform to the test and design requirements. The three-sided sections shall be cured for a sufficient length of time so that the concrete will develop the required compressive strength. The forms used in manufacture shall be sufficiently rigid and accurate to maintain the three-sided section dimensions within the permissible variations. Handling devices or holes shall be permitted in each three-sided section for the purpose of handling and laying. Cylinders and cores shall be obtained and tested for compressive strength to meet the requirements prescribed.