What is a catchment and how does it relate to a drainage basin?

What is a catchment and how does it relate to a drainage basin?

• A. Catchment is the land area where precipitation drains to a common outlet; essentially the same as a drainage basin.
• B. Catchment is the river channel itself.
• C. Drainage basin is the area of rainfall.
• D. They are completely different hydrological concepts.

Answer: (A)

A catchment is the land area where precipitation drains to a common outlet, bounded by topographic divides. This area feeds the river system, channel, and downstream outlets. The drainage basin is the geographic region drained by a river and its tributaries, essentially the same area described by a catchment. In practice, both terms refer to the land that collects water and directs it into the same outlet; the river channel is just the conduit within that area, not the boundary itself. So the catchment and the drainage basin describe the same fundamental region that gathers water and channels it toward a common outlet.

A catchment is the land area where precipitation drains to a common outlet, bounded by topographic divides. This area feeds the river system, channel, and downstream outlets. The drainage basin is the geographic region drained by a river and its tributaries, essentially the same area described by a catchment. In practice, both terms refer to the land that collects water and directs it into the same outlet; the river channel is just the conduit within that area, not the boundary itself. So the catchment and the drainage basin describe the same fundamental region that gathers water and channels it toward a common outlet.