403. Arches are variously described according to the shape of the intrados, and also according to the form of the soffit:

Basket-Handled Arch - One whose intrados consists of a series of circular arcs tangent to each other. They are usually three-centered or five-centered, as described below.

Catenarian Arch - One whose intrados is the mathematical curve known as a catenary.

Circular Arch - One whose intrados is the arc of a circle.

Elliptical Arch - One whose intrados is a portion of an ellipse.

Hydrostatic Arch - One whose intrados is of such a form that the equilibrium of the arch is dependent upon such a loading as would be made by water.

Pointed Arch - One whose intrados consists of two similar curves which meet at a point at the top of the arch.

Relieving Arch - An arch which is built above a lintel, which relieves the lintel of the greater portion of its load.

Right Arch - An arch whose soffit is a cylinder, and whose ends are perpendicular to the axis of the arch.

Segmental Arch - One whose intrados is a circular arc which is less than a semicircle.

Semicircular Arch - One whose intrados is a full semicircle. Such an arch is also called a full-centered arch.

Skew Arch - An arch whose soffit may or may not be cylindrical, but whose ends are not perpendicular to the axis of the arch. They are also called oblique arches.