What is meant by a 'lift' in the context of site engineering?

In site engineering, the term 'lift' refers specifically to a single layer of compacted soil. When soil is being graded or prepared for construction, it is often placed in layers, known as lifts, which are subsequently compacted to achieve the desired density and stability. Each lift is typically of a certain thickness, and the process of compacting each layer helps to ensure that the foundation or base for structures is solid and can support the weight of buildings or other loads placed on it.

The concept of lifts is crucial for ensuring proper drainage and load-bearing capacity, as inadequate compaction may lead to settling, erosion, or other issues later on. Effective lift construction also plays a key role in managing stormwater and preventing water accumulation, as it influences the movement of water through the soil profile.

In this context, the other options do not accurately reflect the definition of a 'lift' in site engineering. Drainage features, planting methods, and water retaining structures are all distinct concepts that involve different engineering principles and practices. Understanding lifts is fundamental for engineers and landscape architects as they work on grading and drainage projects.