With the development of national standards for design and manufacturing, box culverts are rapidly becoming a large part of the precast industry. One of the unique benefits of precast concrete boxes is their fast and easy installation, even under adverse field and weather conditions. Precast boxes, like concrete pipe, can be custom fabricated to any configuration needed or desired in the field. Where larger waterway capacity is required, multiple sections can be placed side-by-side or connected in rows to provide an excellent storm water detention system for areas with outfall flow restrictions or requirements for on-site detention.