NCEES Principles and Practice of Surveying Practice Exam 2026 – All-in-One Study Guide to Ensure Exam Success!

A bench mark serves as a crucial reference point in surveying, specifically for determining elevations. It is a permanent physical marker with a known elevation above a reference point, typically sea level. Surveyors use bench marks to establish the elevations of various points in relation to this established reference, ensuring consistency and accuracy in topographical surveys, construction projects, and various other applications.

When surveyors need to find the elevation of a new point, they can refer to one or more bench marks to calculate the height above or below the known elevation. This allows for precise leveling and is essential in projects such as drainage design, road construction, and land development. In essence, the primary purpose of a bench mark is to provide a reliable standard that supports the accurate measurement of elevations across a surveying project.