Why is a drainage basin called an open system?

Because water enters as input and leaves as output

When does a river deposit its load?

When it loses energy and slows down

By the river depositing its coarsest load at the bank during floods

A high flood risk because the river rises quickly

It speeds water downstream and raises flood risk there

It is usually cheaper and less damaging to the environment

15questions. Pick an answer and you'll see why right away.

What is the boundary of a drainage basin called?
Which is a transfer of water in a drainage basin?
Why is a drainage basin called an open system?
Which process wears away the river's load itself, making it smaller and rounder?
Which transportation process rolls large boulders along the bed?
When does a river deposit its load?
What rock arrangement is needed to form a waterfall?
On a meander, where does deposition occur?
How does a levee form?
Which is a human cause of river flooding?
On a storm hydrograph, what does a short lag time indicate?
Which of these is a soft engineering flood-management method?
What is a disadvantage of channel straightening?
Why is soft engineering often considered more sustainable than hard engineering?
In which course of a river does vertical erosion form a V-shaped valley?