What does the term arroyo refer to?

The term "arroyo" refers to an ephemeral stream, which is a watercourse that typically flows only during periods of rain or immediately following it, often becoming dry during other times. Arroyos are commonly found in arid or semi-arid regions where rainfall is infrequent, leading to intermittent flow. The landscape can be shaped by the erosive power of these streams during periods of precipitation, creating a distinctive landform characterized by steep-sided banks.

In contrast, the other options do not accurately describe an arroyo. A permanent lake is a body of still water that does not dry out, a type of wetland involves areas that are consistently saturated with water, while a human-made canal is engineered for water conveyance rather than a naturally occurring watercourse. Understanding these distinctions is essential for managing and preserving water resources and understanding the hydrological processes in various landscapes.