What is the main purpose of construction surveys?

The main purpose of construction surveys is to locate structures and benchmarks from drawings. This involves precise measurement and placement of points on the ground that correspond to the designs and specifications outlined in architectural and engineering plans. Construction surveys ensure that buildings, roads, and other structures are positioned correctly according to the approved site layout, which is vital for the integrity and functionality of the project.

The accuracy of these surveys has a direct impact on the overall success of a construction project, as they provide critical data needed for excavation, foundation laying, and other construction activities. Properly locating these points helps in avoiding errors that could lead to costly rework or structural problems later on.

In the context of the other options, establishing zoning laws pertains more to land use regulations and planning than to the precise activities of construction surveys. Mapping historical sites involves documentation and preservation of cultural heritage, which is not a function of construction surveying. Assessing land for agricultural use focuses on evaluating land for farming potential rather than the layout and positioning of structures, making it distinct from the primary role of construction surveys.