Balance hídrico en la cuenca alta del Río Reventazón, Costa Rica

Abstract

A water balance was established for the upper part of the Reventazón river basin. The basin is contro- lled by 13 rain gauge stations. The rainy season ranges from May till November with an average precipitation of 3412 mm/y. The area of highest rain-fall is controlled by the station T-Seis. The surface run-off is registered by the following stations: La Troya, Palomo, La Suiza and Angostura. The maximum surface run-off of about 300 m3/s was measured at the Angostura.station The minimum dry season surface run-off va- lues are only 10% of this amount. The observation period ranges from 1977 to 1993 showing an annual average of 77 to 110 m3/s. The average of the total period is 90 m3/s. Depending of the subcatchment area the rate of surface run-off to precipitation differs from 48% to 82% and concer- ning to this values the evapotranspiration varies from 18% to 52%. The groundwater discharge was determined by the method of Kille (1970) and Wundt (1953). The calculated values vary in the range of 15 l/s/km2 at La Troya and 50 l/s/km2 at Palomo.