What is the term for the land area from which surface runoff drains into a particular river?

What is the term for the land area from which surface runoff drains into a particular river?

• A. Catchment
• B. Delta
• C. Mouth
• D. Estuary

Answer: (A)

The land area that collects rainfall and surface runoff and drains it toward a particular river is called a catchment. This region is defined by the surrounding high ground that directs water toward the river and its network of streams. The catchment (also known as a drainage basin or watershed) is the whole area whose precipitation ultimately ends up in that river, influencing how much water the river carries, how floods develop, and how water resources are managed. The boundaries are set by ridgelines, so water on one side flows toward this river while water on the other side goes to neighboring rivers. A delta forms where the river deposits sediment as it enters a larger body of water; the mouth is the point where the river meets that body of water; and an estuary is the tidal, mixing zone at that mouth. These terms describe features at the river’s end or transitional zones, not the area that drains into the river itself.

The land area that collects rainfall and surface runoff and drains it toward a particular river is called a catchment. This region is defined by the surrounding high ground that directs water toward the river and its network of streams. The catchment (also known as a drainage basin or watershed) is the whole area whose precipitation ultimately ends up in that river, influencing how much water the river carries, how floods develop, and how water resources are managed. The boundaries are set by ridgelines, so water on one side flows toward this river while water on the other side goes to neighboring rivers.

A delta forms where the river deposits sediment as it enters a larger body of water; the mouth is the point where the river meets that body of water; and an estuary is the tidal, mixing zone at that mouth. These terms describe features at the river’s end or transitional zones, not the area that drains into the river itself.