...of a compacted crushed stone base or non-reinforced concrete as shown on the.....Pipe.. A. If required, the drainage pipe shall be perforated or slotted PVC pipe.....geogrid soil ...
PIPE CULVERTS. TABLE IIB: Class of Reinforced Concrete Elliptical and Reinforced Concrete Arch Pipe for the Respective Equivalent Round Size of Pipe and Fill Heights over the Top of Pipe ...