Resumo

QUESADA Q, Marvin E  e  WAYLEN, Peter R. Annual and Seasonal Hydrological Differences in Adjacent Regions: A Study of the Virilla and Grande de San Ramon River Basins (Costa Rica). Cuad. Geogr. Rev. Colomb. Geogr. [online]. 2012, vol.21, n.2, pp.167-175. ISSN 0121-215X.

The article presents the findings of a study of the behavior of the flow rates of the sub-basins of the Virilla and Grande de San Ramón rivers, in the basin of the Grande de Tárcoles River, Costa Rica. On the basis of a statistical analysis of the flow measurements of both sub-basins and of a correlation test, it was found that some geographical aspects (topographic irregularity, presence of passes between mountains, extension of the sub-basins, land use, and influence of diferent atmospheric circulation patterns) foster substantial diferences in the flow regime. Prior to 1975, the Grande de San Ramón River showed a figure above the median and, later, a figure below the median, while after 1975, the flow rate of the Virilla River sub-basin exceeded that of the Grande de San Ramón River.

Palavras-chave : flows; climate conditions; Costa Rica; Grande San Ramon; Virilla.

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