What does "graded land" refer to in soil classification?

Graded land in the context of soil classification specifically refers to land that has undergone modification where soil has been removed. When soil is removed, the land loses its ability to maintain the natural soil characteristics needed for classification within a specific soil series. The actions of grading alter the environmental and geological conditions, leading to a situation where traditional soil classification methods cannot be applied effectively. This understanding is crucial because the removal of soil can significantly impact drainage, compaction, and overall land usability, making the land unsuitable for typical classification in soil surveys.

While the other options describe different conditions of land, they do not capture the essence of what graded land represents in terms of soil classification, which is fundamentally tied to the absence of sufficient soil to classify it within established frameworks.