What does Benchmark Mean?

Definition of Benchmark in Construction
An established elevation on a jobsite . All elevation points on the site, must be referenced off a set elevation, called a benchmark. The benchmark is normally located on a solid surface that will not vary throughout the project. Errors have occurred due to the location of an established bench mark on a tree, which grows 2 inches during the course of the project, or the top of a fire hydrant which changes upon the usage of the hydrant. The benchmark on a project is a sacred marking for the project, and must be protected from being damaged or lost. On many projects there are several benchmarks established to ensure they are not lost during the course of the project. The project licensed surveyor is usually assigned the task of establishing the benchmark on the project, and will be responsible legally for this determination.