What term describes an area of land where all water drains to a common outlet?

What term describes an area of land where all water drains to a common outlet?

• A. Watershed
• B. Drainage basin
• C. Impervious surface
• D. Runoff

Answer: (A)

The key idea here is how land areas collect water and channel it toward a single exit. A watershed is that area of land where all rainfall and surface water drains to a common outlet, such as a river, lake, or ocean. The boundary of a watershed is defined by drainage divides—high ridges that direct water to one outlet on one side and to another outlet on the other side. In many contexts, this concept is also called a drainage basin, and the two terms describe the same idea, just used in slightly different terminology. Impervious surfaces describe materials like asphalt or concrete that prevent infiltration, which can increase the amount of water that becomes surface runoff, but they describe a feature within a watershed, not the land area that drains to a single outlet. Runoff refers to the water itself moving across the surface toward outlets, not the whole land area that drains to that outlet. So the term that best fits “an area of land where all water drains to a common outlet” is watershed.

The key idea here is how land areas collect water and channel it toward a single exit. A watershed is that area of land where all rainfall and surface water drains to a common outlet, such as a river, lake, or ocean. The boundary of a watershed is defined by drainage divides—high ridges that direct water to one outlet on one side and to another outlet on the other side. In many contexts, this concept is also called a drainage basin, and the two terms describe the same idea, just used in slightly different terminology.

Impervious surfaces describe materials like asphalt or concrete that prevent infiltration, which can increase the amount of water that becomes surface runoff, but they describe a feature within a watershed, not the land area that drains to a single outlet. Runoff refers to the water itself moving across the surface toward outlets, not the whole land area that drains to that outlet. So the term that best fits “an area of land where all water drains to a common outlet” is watershed.