One having horizontal or nearly horizontal upper and lower surfaces. Also called flat or straight arch.

An arch having horizontal or nearly horizontal upper and lower surfaces. (Flat or Straight Arch)

This arch, also called a flat arch, straight arch, minor arch, segmented arch, or multi-centered arch, has a horizontal top surface, with a span of up to 6 feet, can support loads up to 1,000 pounds per square foot, with a rise to span ratio of 0.15 or less.