A river basin is a land area into which underground groundwater and various water bodies flow. All of them enter the system of a certain river, but the regimes of surface and underground catchment do not coincide. Since it is difficult to track the sources of groundwater, it is the tributaries of the river that form the basis of the basin.
Water exchange between the main river, lakes and small rivers occurs regularly, which ensures the regime of the river basin. Between neighboring reservoirs passes the border along the watershed line.
Types of river basins
Scientists distinguish two types of river basins - sewage and drainage. The drainless basins include the waters of rivers and lakes that are not connected to the oceans through the main river. By location, shape and size, they are diverse. Accordingly, sewage areas are those that as a result have access to the ocean.
All river basins are characterized by the length of the main river and the area of the river catchment, the volume of water flow and the stability of the river bed, power sources and hydro-regime conditions. By the length of the river are divided into large, medium and small. The rivers are fed thanks to rainwater, snow, ice, underground, and the waters of streams, lakes and small rivers are also of importance. Most often, river basins have a mixed diet when there are several sources of water.
The largest river basins in the world
It is believed that each river has a pool, regardless of whether it flows into another river, sea or ocean. The largest pools of the following rivers:
Depending on the area of river basins, they are, first of all, of great economic importance. Rivers are the main source of fresh water. Their waters are used for irrigation of fields, irrigation systems are created, water resources are also used in industry (metallurgy, energy, chemical industry). Not the last value river basins play for fishing. One of the functions of the rivers is recreational.
Thus, the main river, together with tributaries and groundwater sources forms a river basin. The more water bodies flow into the river, the pool becomes more watery. Since water resources are of paramount importance for people's lives, they are actively used in various areas of the economy and everyday life. This leads to the depletion of some reservoirs, but to avoid this, it is necessary to rationally use the waters of the river basins of the planet.