Water budget in climate-system
The topic of this section is river water on the earth.
The volume of the land water is very small compared with water all around the earth,
and furthermore, most of the land water is in glacies or ices.
Therefore, the amount of fresh water in rivers is very small.
However, the circulation rate of river water is very high, and for that reason,
the amount of water transportation by rivers is not small.
Furthermore, freshwaters from rivers has great influences on ocean currents.
Therfore, the role of river water circulation is very important in the global