The study of water drained or stored above ground or underground, its physical and chemical characteristics, its volume, its possibilities, and so on.
is of paramount importance for Costa Rica because they depend on the activities that can not or should not be paralyzed in the face that half the country does not receive regular rainfall in one part of the year.
Improve or expand agricultural area under irrigation, construction of new hydroelectric plants in all regions of the country, to ensure a clean and abundant water for the population of the country throughout the year, providing quality water for industries, are some possibilities can be mentioned.
They can also be noted, the use of navigable sections of our great rivers, fishing in rivers and lakes and vacation opportunities for recreation and entertainment provided by lakes and natural or artificial lakes, it created by dams for irrigation or hydropower.
Therefore the knowledge of the national hidrogeográfico system appears as a priority in any plan of development or improvement of living conditions.
The ridge that extends longitudinally the country is the first element that determines the phenomenon of storm drainage to organize and distributed by meteoric waters as exceptional, the type and consistency of the product of rock more or less impervious towater they are in the path.
In Costa Rica, there are more than 50 river basins, some beyond 1000 km ² and other less popular, the largest in the Rio Grande de Térraba (5,077 sq km), it covers the General Assembly of rivers and Coto Brus, following the Tempisque (3,405 km ²), which drains much of the plains of Guanacaste, but if we add the Drinker with the river flowing together in a large estuary in the Gulf of Nicoya, the surface totaled 5.455 km ², which is 11% of the country and the largest watershed in the country.
The third is that of Reventazón Parismina (2,950 km ²) which limits the rise of Sierra Central Volcanic and Talamanca Mountain Range, this basin could be considered together with the Pacuare (882 km ²) with the 3.832 km ² suamarían as arm guaiac is a clear case of the river fork, there are many other cases of river bifurcation in the country, especially in the plains of the Caribbean sufficient flatness to perform irregular, swamps, etc.. This natural condition is of great practical importance because it allows the vessel to change the river without building intercom channels.
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