Which feature in the landscape is defined as a horizontal or sloping step in a slope?

The feature defined as a horizontal or sloping step in a slope is known as a bench. Benches are often created in landscaping and grading to help stabilize slopes, reduce erosion, and enhance aesthetic appeal. They serve to interrupt the flow of water on steep slopes, allowing for better drainage and reducing the risk of landslides.

Benches can also provide a flat surface for planting vegetation or for aesthetics in design. This makes them a crucial element in both landscape architecture and civil engineering, particularly in areas where soil erosion is a concern.

The other choices represent different elements commonly found in landscape and drainage design: a base course is typically a layer of material placed to support a driving surface; an area drain is designed to collect and redirect surface water; and bioretention refers to systems that utilize natural processes to treat stormwater. Understanding the unique roles and definitions of these features aids in effective landscape and stormwater management planning.