What is one indicated benefit of using watering equipment in arena maintenance?

Using watering equipment in arena maintenance significantly helps reduce dust. When dust levels are high, it can create health hazards for both animals and humans, making it harder to breathe and leading to potential respiratory issues. By applying water to the surface of the arena, you effectively dampen the dust particles, which helps to keep them from becoming airborne. This not only improves the air quality but also enhances visibility for riders and competitors during events.

The other benefits, while valid in different contexts, do not align as closely with the primary advantages of watering equipment specifically for arena maintenance. For instance, enriching soil is more relevant to agricultural practices rather than arena upkeep. Creating a cooler environment can occur due to watering, but it's not a primary reason for maintenance. Speeding up drainage is typically associated with improving runoff rather than the direct impact of watering on arena surfaces. Thus, the primary benefit of reducing dust is a fundamental reason why watering equipment is essential in maintaining a clean and safe arena.