The measurement is from peak to peak and the height is from the valley to the top.
Standard corrugation measure 2 2/3" x 1/2"
This corrugation measures 3"x 1"
Above is the list of the standard diameters for production.
Culverts come in many different gauges. The lightest is 16 gauge and the heaviest is 10 gauge.
Most culverts are round in shape.
Arched culverts are used when the available headroom is minimal. This allows for more cover on the top of the culvert.