What is the primary purpose of a benchmark in property surveying?

The primary purpose of a benchmark in property surveying is to determine elevation. Benchmarks are physically established points whose elevation has been precisely measured against a known reference, typically sea level. They provide a reliable point of reference for surveyors to establish elevation across a property or area, which is critical in various surveying tasks, such as grading, drainage design, and construction planning. This ensures that any development adheres to proper elevation standards, which is vital for both functional and aesthetic considerations.

In contrast, while property boundaries are marked by boundaries or monuments, they are not the function of a benchmark. Similarly, determining land use and outlining legal descriptions involve different aspects of surveying and land assessment that do not directly relate to the primary function of benchmarks. Benchmarks play a specific and crucial role in elevation determination, ensuring consistency and accuracy in land surveying practices.