Why is knowing the grade point essential in grading and excavation work?

Knowing the grade point is essential in grading and excavation work because it indicates where the natural ground elevation intersects with the proposed finished grade of the project. This intersection helps in determining the existing topographic conditions, which is critical for planning the grading and excavation processes.

Understanding where the natural ground meets the work sections allows engineers and contractors to make informed decisions regarding the extent of grading required as well as the methods of excavation and fill placement. It establishes a baseline for leveling the site and ensures that the finished product meets design specifications and drainage requirements.

The determination of volume of grading work, while important, relies on the accurate identification of where the grade meets the natural ground. Similarly, identifying materials for cut and fill is based on this knowledge, but knowing the grade point provides the precise reference needed to assess these materials correctly. Calculating material waste during transport is also influenced by understanding the grading work, but it doesn't directly hinge on the concept of the grade point itself.