What does it mean when a vertical control point has Benchmark coincident with a found section corner?

What does it mean when a vertical control point has Benchmark coincident with a found section corner?

• A. A vertical control point where Benchmark coincident with found section corner.
• B. A vertical control point with a tablet.
• C. A recoverable mark with no tablet.
• D. A U.S. location monument.

Answer: (A)

In surveying, a benchmark is a fixed point with a precisely known elevation, used as a reference for vertical measurements, while a section corner is a physical corner of a surveyed township. When a vertical control point has the benchmark coincident with a found section corner, that means the benchmark mark sits exactly at the same location as the section corner. The elevation reference you rely on for the vertical control at that corner comes from the benchmark right at that spot, making it easy to tie vertical measurements to a known value at that precise point. This is why this option best describes the situation—the two marks share the same location, providing a reliable elevation reference there.