A point of designated elevation accessible at all times during construction is called a ___.

A point of designated elevation accessible at all times during construction is called a ___.

• A. Datum
• B. Control Point
• C. Benchmark
• D. Elevation

Answer: (C)

The concept being tested is using a fixed, physically accessible reference point with a known elevation to check elevations during construction. A benchmark is exactly that—a durable marker with a published elevation tied to a recognized datum, kept in place so survey crews can read it at any time and verify elevations as work progresses. This accessibility and permanence are what make it the best fit for a point of designated elevation used throughout a project. By contrast, a datum is the reference plane used to define elevations overall; it’s the idea behind the measurements rather than a specific on-site marker you can read. A control point serves as a reference for layout and location, not necessarily providing a direct, ongoing elevation reading. Elevation refers to the height itself, not a physical marker.

The concept being tested is using a fixed, physically accessible reference point with a known elevation to check elevations during construction. A benchmark is exactly that—a durable marker with a published elevation tied to a recognized datum, kept in place so survey crews can read it at any time and verify elevations as work progresses. This accessibility and permanence are what make it the best fit for a point of designated elevation used throughout a project.

By contrast, a datum is the reference plane used to define elevations overall; it’s the idea behind the measurements rather than a specific on-site marker you can read. A control point serves as a reference for layout and location, not necessarily providing a direct, ongoing elevation reading. Elevation refers to the height itself, not a physical marker.