%0 Journal Article %T Diferencias hidrol車gicas anuales y estacionales en regiones adyacentes: estudio de las subcuencas de los r赤os Virilla y Grande de San Ram車n, Costa Rica %A Quesada Q %A Marvin E %A Waylen %A Peter R %J Cuadernos de Geograf赤a - Revista Colombiana de Geograf赤a %D 2012 %I Universidad Nacional de Colombia %X 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 ram車n rivers, in the basin of the grande de t芍rcoles 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 ram車n 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 ram車n river. %K flows %K climate conditions %K costa rica %K grande san ramon %K virilla. %U http://www.scielo.org.co/scielo.php?script=sci_abstract&pid=S0121-215X2012000200012&lng=en&nrm=iso&tlng=en